Eu2+ and (or) Eu3+ doped Sr2SiO4 phosphors particles were synthesized by a conventional solid-state reaction technique, and their structural and optical properties were investigated. The X-ray diffraction (XRD) result...Eu2+ and (or) Eu3+ doped Sr2SiO4 phosphors particles were synthesized by a conventional solid-state reaction technique, and their structural and optical properties were investigated. The X-ray diffraction (XRD) results showed that the obtained phosphors were composed of orthorhombic α'-Sr2SiO4 and monoclinic β-Sr2SiO4 phase. When excited under 256 nm, Sr2SiO4:Eu3+ phosphors showed intense emission in the red region. Sr2SiO4:Eu3+ phosphors exhibited white emissions (x=0.30, y=0.40, TC=6500 K) ranging from 425 to 650 nm when it was excited by near-ultraviolet (near-UV) light, indicating that Sr2SiO4:Eu2+ was a good light-conversion phosphor candidate for near-UV chip.展开更多
MnOx-CeO2 composite catalysts were prepared by a coprecipitation method and tested for formaldehyde(HCHO) and carbon monoxide(CO) oxidation. X-ray photon spectroscopy(XPS) results indicated that the average oxidation ...MnOx-CeO2 composite catalysts were prepared by a coprecipitation method and tested for formaldehyde(HCHO) and carbon monoxide(CO) oxidation. X-ray photon spectroscopy(XPS) results indicated that the average oxidation state of surface Mn species in CeMn composite catalyst was higher compared to the pure MnOx. The enhancement of reactivity for HCHO oxidation was due to the activation of the lattice oxygen species in MnOx by the addition of CeO2,which was confirmed by the H2 temperature programmed reduction(H2-TPR) results. The remarkable enhancement of reactivity for CO oxidation by the addition of CeO2 was due to the active oxygen species generated on the CeO2 surface which directly participated in the reaction.展开更多
Transference of CuO species and thermal solid-solid interaction in CuO/CeO2-Al2O3 catalyst prepared by an impregnation method were characterized by in-situ XRD, Raman spectroscopy and H2-TPR techniques. For the cataly...Transference of CuO species and thermal solid-solid interaction in CuO/CeO2-Al2O3 catalyst prepared by an impregnation method were characterized by in-situ XRD, Raman spectroscopy and H2-TPR techniques. For the catalyst calcined at 300 ℃, two kinds of CuO species coexist on the surface, that is, highly dispersed and bulk CuO crystalline phase. Four kinds of CuO species are present for the catalyst calcined at 600 ℃: （1） highly dispersed CuO, （2） bulk CuO on the surface, （3） bulk CuO in the internal layer of CeO2, and （4） CuAl2O4 formed from CuO-Al2O3 interaction. For the catalyst calcined at 800 ℃, besides very little highly dispersed and bulk CuO on the surface, most of the CuO has transferred into the internal layer of CeO2 and the mass of CuAl2O4 are increased. At 900 ℃, all of CuO has diffused into the internal layer of CeO2 and formed CuAl2O4. The results show that the distribution of CuO species in the catalysts depends on the calcination temperature; the different CuO species can be effectively confirmed by in-situ XRD, Raman spectroscopy and H2-TPR techniques.展开更多
The Ce0.7Zr0.3O2 solid solution and CeO2 were prepared using the sol-gel method. The phase structure, crystallite sizes and the re- ducibility of the catalysts were characterized by XRD and H2-TPR techniques. XRD resu...The Ce0.7Zr0.3O2 solid solution and CeO2 were prepared using the sol-gel method. The phase structure, crystallite sizes and the re- ducibility of the catalysts were characterized by XRD and H2-TPR techniques. XRD results indicated that Zr4+ had replaced part of Ce4+ to form a fluorite-like solid solution, which was favorable to obtain ultrafine nanoparticles. The ratio of main H2 consumption for Ce0.7Zr0.3O2:CeO2 was 4.4:1.0, implying that the solid solution could improve the reducibility compared to the single CeO2. The Ce0.7Zr0.3O2 solid solution catalyst showed a sharp combustion peak at 397 oC, which was 200 oC lower than that of the single soot. The good catalytic ac- tivity of the Ce0.7Zr0.3O2 was attributed to the formation of nano-CeO2-based solid solution, which enhanced the reducibility and then im- proved the combustion activity. As Ce0.7Zr0.3O2 could be easily reduced to Ce0.7Zr0.3O2-x, meanwhile, after oxygenation, the Ce0.7Zr0.3O2-x was recovered to Ce0.7Zr0.3O2 completely. A catalytic combustion reaction mechanism was proposed: the Ce0.7Zr0.3O2 was reduced to Ce0.7Zr0.3O2-x by the reaction with carbon and then it was recovered to Ce0.7Zr0.3O2-x by the interaction with O2.展开更多
Novel CexY1–xO washcoats adhered on the cordierite honeycomb, used as supports for Pd catalysts, were prepared by an impregnation method. It was found that the CexY1–xO washcoats had better adhesion and higher adsor...Novel CexY1–xO washcoats adhered on the cordierite honeycomb, used as supports for Pd catalysts, were prepared by an impregnation method. It was found that the CexY1–xO washcoats had better adhesion and higher adsorption efficiency of H2PdCl4, and the optimal component of the washcoat was Ce0.8Y0.2O. Model reaction of catalytic combustion of toluene was chosen to evaluate the performance of the developed Pd/CexY1–xO/substrate catalysts. The results showed that the catalytic performance of the Pd/CexY1–xO/substrate catalysts depended on the component of the washcoats, with the Pd/Ce0.8Y0.2O/ substrate catalyst giving the best catalytic activity and thermal stability.展开更多
The CexTh1-xO2 solid solutions were prepared by citrate sol-gel method, and their structure and reduction properties were studied. XRD shows that solid solution with cubic phase formed in all the solid solutions （x =...The CexTh1-xO2 solid solutions were prepared by citrate sol-gel method, and their structure and reduction properties were studied. XRD shows that solid solution with cubic phase formed in all the solid solutions （x = 0.2, （0.5, 0.8） ）CexTh1-xO2. Raman spectrum shows that Ce-Th complex oxides can promote the formation of oxygen vacancies. Two reduction peaks appear in the TPR profiles of Cex Th1-xO2 solid solution. The α peak is attributed to the reduction of Ce4+ on the surface, and the β peak is attributed to the reduction of bulk CeO2. The incorporation of Th atom into CeO2 improves the reduction of CeO2. CexTh1-xO2 mixed oxides are promising materials for oxygen vacancies produced, as well as catalysts for many reactions involved oxygen, such as the catalysts for three-way reactions for reducing the releasing pollutants or combustion of VOCs.展开更多
A detailed study on the synergetic effect of TeMo5O16 and MoO3 phases in the MoTeOx catalysts for the partial oxidation of propylene to acrolein has been reported in this work. It was found that both propylene convers...A detailed study on the synergetic effect of TeMo5O16 and MoO3 phases in the MoTeOx catalysts for the partial oxidation of propylene to acrolein has been reported in this work. It was found that both propylene conversion and acrolein selectivity increased with the addition of MoO3 to TeMo5O16. Based on the results of N2 adsorption-desorption, XRD, XPS, in-situ XRD, O2-TPO, and 2-propanol decomposition reaction, the higher catalytic performance and synergetic effect could be attributed to the enhancement of acidity and the oxygen transfer from TeMo5O16 to MoO3 phase.展开更多
Y2O3:Er3+ films were prepared by a simple sol-gel process. The structural properties of Y2O3:Er3+ films were characterized with X-ray diffraction,Fourier transform infrared spectroscopy and field emission scanning ele...Y2O3:Er3+ films were prepared by a simple sol-gel process. The structural properties of Y2O3:Er3+ films were characterized with X-ray diffraction,Fourier transform infrared spectroscopy and field emission scanning electron microscopy. The results indicated that the Y2O3:Er3+ films might have high upconversion efficiency because of their low vibrational energy. Under 785 and 980 nm laser excitation,the samples showed green(2H11/2→4I15/2,4S3/2→4I15/2) and red(4F9/2→4I15/2) upconversion emissions. The upconversion mechanisms were studied in detail through laser power dependence. Excited state absorption and energy transfer process were discussed as possible upconversion mechanisms. The cross relaxation process in Er3+ was also investigated.展开更多
The high-surface area nano-CeO2 was prepared by Ce(NO3)3 by precipitation method, with surfactant cetyltrimethyl ammonium bromide (CTAB) as templating agent. The effects of the precipitating agents, reaction temperatu...The high-surface area nano-CeO2 was prepared by Ce(NO3)3 by precipitation method, with surfactant cetyltrimethyl ammonium bromide (CTAB) as templating agent. The effects of the precipitating agents, reaction temperature, ageing time, and calcination temperature on the surface area, as well as the pore structure and the mean crystallite size of nano-CeO2 were studied. It was found that the reaction of Ce(NO3)3 with NaOH in the presence of CTAB at 90 ℃ for 12 h yieldsed a cerium oxide/surfactant mixture, which after calcination at 400 ℃ resulted in high-surface area nano-CeO2. The mean crystallite size of CeO2 was approximately 6 nm, surface area was in excess of 200 m2·g-1, pore size was approximately 9 nm, and the pore distribution was concentrative. Moreover, the surface area can still reach 147 m2·g-1 after calcination at 700 ℃, which showed the good thermal stability of the CeO2. The number of oxygen vacancies in the structure of CeO2 corresponded with the surface area of CeO2, and the high surface area was propitious to the formation of oxygen vacancies.展开更多
Two novel washcoats Ce0.8Zr0.15La0.05Oδ and Ce0.8Zr0.2O2 was prepared by an impregnation method, which acted as a host for the active Pd component to prepare Pd/Ce0.8Zr0.15La0.05Oδ/substrate and Pd/Ce0.8Zr0.2O2/subs...Two novel washcoats Ce0.8Zr0.15La0.05Oδ and Ce0.8Zr0.2O2 was prepared by an impregnation method, which acted as a host for the active Pd component to prepare Pd/Ce0.8Zr0.15La0.05Oδ/substrate and Pd/Ce0.8Zr0.2O2/substrate monolithic catalysts for toluene combustion. The washcoats was characterized by X-ray diffraction (XRD), Raman spectroscopy, Brunauner-Emmett-Teller (BET), and H2-temperature-programmed reduction (H2-TPR). The result indicated that both the washcoats had strong vibration-shock resistance according to ultrasonic test. Doping La3+ into CeO2-ZrO2 solid solution could generate more oxygen vacancies, and could inhibit the sinter of CeO2-ZrO2 solid solution when calcined at high temperatures (800, 900 and 1000 °C). The washcoat Ce0.8Zr0.15La0.05Oδ had much better redox properties. The reductive temperature of Ce4+ species shifted to low temperature by 60 °C when the washcoats calcined at high temperatures (800, 900 and 1000 °C). The Pd/Ce0.8Zr0.15La0.05Oδ/substrate monolithic catalyst calcination at 500 °C had the best catalytic activity and the 95% toluene conversion at a temperature as low as 190 °C. When calcined at low temperature (500 and 700 °C), the catalytic activity has little improvement, however, when calcined at high temperature, the catalytic activity of Pd/Ce0.8Zr0.15La0.05Oδ/substrate monolithic catalysts had significant improvement. As catalyst washcoat, the Ce0.8Zr0.15La0.05Oδ had better thermal stability than the washcoat Ce0.8Zr0.2O2, the developed Pd/Ce0.8Zr0.15La0.05Oδ/ substrate monolithic catalyst in this work was promising for eliminating Volatile organic compounds.展开更多
Three complexes, [Pr（NO3）3（HL）2] （1）, [Nd（NO3）3（HL）2] （2） and [Er（NO3）3（HL）2]·0.5H2O （3）, were synthesized from the reaction of a Schiff base ligand 2-[（4-methylphenylimino）methyl]-6-methoxyph...Three complexes, [Pr（NO3）3（HL）2] （1）, [Nd（NO3）3（HL）2] （2） and [Er（NO3）3（HL）2]·0.5H2O （3）, were synthesized from the reaction of a Schiff base ligand 2-[（4-methylphenylimino）methyl]-6-methoxyphenol （C 15H 15NO2, HL） with Ln（NO3）3·6H2O （Ln=Pr, Nd, Er）. Characterization by single-crystal X-ray diffraction technique, elemental analysis, molar conductance, FT-IR, UV-Vis, 1H NMR and thermal analysis shows the title complexes are neutral molecules where the central Ln（Ⅲ） ion is ten-coordinated in biapical anti-hexahedron prism geometry, with four oxygen atoms of the phenolic hydroxy and methoxy groups in the two bidentate Schiff base ligands and six oxygen atoms provided by the three bidentate NO3- anions. Additionally, the kinetic mechanism of thermal decomposition of complex 3 was determined with a TG-DTG curves by both integral and differential methods. The functions of thermal decomposition reaction mechanism and the equation of kinetic compensation effect were obtained.展开更多
Two new zinc(II) complexes, [Zn2L2Cl4]·2[ZnL(CH3OH)Cl2] 1 and [ZnL2(NO3)2] 2, were synthesized by reacting ZnX2·nH2O (X = Cl-, NO3-) and a Schiff base ligand 2-[(4-me- thylphenylimino)methyl]-6-methoxyphenol...Two new zinc(II) complexes, [Zn2L2Cl4]·2[ZnL(CH3OH)Cl2] 1 and [ZnL2(NO3)2] 2, were synthesized by reacting ZnX2·nH2O (X = Cl-, NO3-) and a Schiff base ligand 2-[(4-me- thylphenylimino)methyl]-6-methoxyphenol (C15H15NO2, L) which was obtained by the condensation of o-vanillin (2-hydroxy-3-methoxybenzaldehyde) with p-toluidine. Both 1 and 2 were characterized by single-crystal X-ray diffraction technique, elemental analysis, molar conductance, FT-IR, UV-Vis, 1H-NMR spectra and thermogravimetric analysis. The Schiff base ligand and its zinc(II) complexes have been tested in vitro to evaluate their antibacterial activity against bacteria, viz., Escherichia Coli, Staphylococcus aureus and Bacillus Subtilis. The results show that these complexes have higher activity than the corresponding free Schiff base ligand against the same bacteria.展开更多
The title complex, Zn(C14H13NO)2Cl2 1, has been synthesized by the reaction of zinc chloride with Schiff base ligand N-salicylidene-p-toluidine and its structure was determined by single-crystal X-ray diffraction. The...The title complex, Zn(C14H13NO)2Cl2 1, has been synthesized by the reaction of zinc chloride with Schiff base ligand N-salicylidene-p-toluidine and its structure was determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group Cc with a = 14.896(3), b = 12.506(2), c = 15.352(3) ?, β = 114.711(4)o, V = 2598.0(8) ?3, C28H26ZnCl2N2O2, Mr = 558.80, Z = 4, Dc = 1.429 g/cm3, μ = 1.179 mm-1, Flack parameter = 0.027(19), F(000) = 1152, R = 0.0709 and wR = 0.1041 for 3117 observed reflections (I > 2σ(I)). In complex 1, the center Zn ion is four-coordinated by two O atoms from two Schiff base ligands and two Cl atoms in a distorted tetrahedral geometry. Additionally, the thermal decomposition of complex 1 as well as its kinetic mechanisms and equations is studied under the non-isothermal integral and differential methods in air by TG-DTG curves.展开更多
The title compound 9-(2-hydroxy-5-nitrophenyl)-9H-dibenzo[c,h]-2,7,10-trioxan-thene-1,8-dione DMF solvate (C28H20N2O9,Mr=528.46) was synthesized and crystallized.The crystal belongs to the triclinic system,space group...The title compound 9-(2-hydroxy-5-nitrophenyl)-9H-dibenzo[c,h]-2,7,10-trioxan-thene-1,8-dione DMF solvate (C28H20N2O9,Mr=528.46) was synthesized and crystallized.The crystal belongs to the triclinic system,space group P1 with a=10.210(3),b=10.698(4),c=12.522(4),α=92.214(6),β=113.751(5),γ=105.040(5)°,Z=2,V=1193.0(7)3,Dc=1.471 g·cm-3,μ(MoKα)=0.112 mm-1,F(000)=548,R=0.0444 and wR=0.1141 for 2667 observed reflections (I > 2σ(I)).X-ray analysis reveals that atoms C(1),C(2),C(3),C(4),C(5) and O(1) on the new 4H-pyran ring are slightly distorted,forming a half-chair conformation.展开更多
The title complex Zn(HL)(NCS)2 (C14H18N4OS2Zn, Mr = 387.81, HL = N-(3-di-methyl-aminopropyl)-salicylaldimine) has been synthesized by the reaction of ZnSO4·7H2O with the Schiff base N-(3-dimethylaminopropyl)-sali...The title complex Zn(HL)(NCS)2 (C14H18N4OS2Zn, Mr = 387.81, HL = N-(3-di-methyl-aminopropyl)-salicylaldimine) has been synthesized by the reaction of ZnSO4·7H2O with the Schiff base N-(3-dimethylaminopropyl)-salicylaldimine derived from the condensation reaction of 3-dimethylamino-1-propylamine with salicyladehyde. It crystallizes in the monoclinic system, space group P21/n with a = 9.8360(8), b = 14.930(1), c = 12.277(1) , ( = 101.455(2)o, V = 1767.0(3) 3, Z = 4, F(000) = 800, Dc = 1.458 g/cm3 and ((MoK() = 1.631 mm-1. The structure was refined to R = 0.0463 and wR = 0.1065 for 2681 observed reflections (I > 2((I)). Crystal analyses revealed that the Zn(II) atom is coordinated by two nitrogen atoms of two NCS-, and an oxygen atom as well as a nitrogen atom of amine from the neutral Schiff base ligand of N-(3-dimethyl-aminopropyl)-sali-cylaldimine to give a distorted tetrahedral geometry.展开更多
Two new diaryquioxaline derivatives, C21H10N2S3Br2 (1) and C21H10Br2N2OS2(2), have been successfully synthesized. These two compounds have been determined by single-crystal X-ray diffraction analyses. Compound 1 cryst...Two new diaryquioxaline derivatives, C21H10N2S3Br2 (1) and C21H10Br2N2OS2(2), have been successfully synthesized. These two compounds have been determined by single-crystal X-ray diffraction analyses. Compound 1 crystallizes in monoclinic system, space group P21/n with a = 12.7896(3), b = 6.0613(2), c = 26.1153(7) A,β= 94.1810(10)°, V = 2018.(97) A^3, Z = 4, C21H10N2S3Br2, Mr = 546.32, Dc = 1.797 g/cm^3 and F(000)= 1072. The final R = 0.0343 and wR = 0.785 for 3585 observed reflections with I> 2σ(I). Compound 2 crystallizes in monoclinic system, space group P2x/n with a = 7.8638(4), b = 14.3447(7), c = 17.8936(8) A, β = 96.6980(10)°, V = 2004.69(17) A3, Z = 4, C21H10Br2N2OS2, Mr = 530.25, Dc = 1.757 g/cm^3 and F(000)= 1040. The final R = 0.0988 and wR = 0.1108 for 4613 observed reflections with I > 2σ(I). By combination of diarylquinoxaline core and a 1,3-dithiole-2-thione unit, compound 1 is used as "turn on" chemosensors for Hg^2+by making use of the aggregation-induced emission (AIE) feature of diarylquinoxaline core and the specific reaction of 1,3-dithiole-2-thione with Hg^2+.展开更多
The title compound, [Cu2(CH3COO)4(C8H10N2)]n·nCH3CN 1 (C8H10N2, 4,4-bipy = 4,4-bipyridine), has been solvothermally synthesized in CH3CN and characterized by X-ray diffraction. The crystal is of monoclinic, space...The title compound, [Cu2(CH3COO)4(C8H10N2)]n·nCH3CN 1 (C8H10N2, 4,4-bipy = 4,4-bipyridine), has been solvothermally synthesized in CH3CN and characterized by X-ray diffraction. The crystal is of monoclinic, space group Cc with a = 22.626(6), b = 14.012(4), c = 15.106(4) ?, β = 107.610(3)o, V = 4565(2) 3, C20H23Cu2N3O8, Mr = 560.49, Z = 8, Dc = 1.631 g/cm3, μ = 1.914 mm-1, Flack parameter = 0.48(1), F(000) = 2288, R = 0.042 and wR = 0.098 for 8887 observed reflections (I > 2σ(I)). It consists of nearly linear one-dimensional chains [Cu2(CH3COO)4(C8H10N2)]n derived from paddle-wheel [Cu2(CH3COO)4] unit linked by 4,4?-bipy, and CH3CN as guest molecule regularly decorates between the chains.展开更多
Partial oxidation of methane to syngas(POM)over Rh/SiO_2 catalyst was investigated using in-situ FT-IR.When methane interacted with 1.0wt%Rh/SiO_2 catalyst,it was dissociated to adsorbed hydrogen and CH_x species.The ...Partial oxidation of methane to syngas(POM)over Rh/SiO_2 catalyst was investigated using in-situ FT-IR.When methane interacted with 1.0wt%Rh/SiO_2 catalyst,it was dissociated to adsorbed hydrogen and CH_x species.The adsorbed hydrogen atoms were transferred to SiO_2 surface by"spill-over"and reacted with lattice oxygen to form surface -OH species. POM mechanism was investigated over Rh/SiO_2 catalyst using in-situ FT-IR.It was found that CO_2 was formed before CO could be detected when CH_4 and O_2 were introduced over the preoxidized Rh/SiO_2 catalyst,whereas CO was detected before CO_2 was formed over the prereduced Rh/SiO_2 catalyst.展开更多
The catalytic wet air oxidation (CWAO) of H acid and phenol was investigated in the presence of Cu or Fe doped CeO_2 solid solutions, which were obtained by sol-gel method. The experiment results showed that the incor...The catalytic wet air oxidation (CWAO) of H acid and phenol was investigated in the presence of Cu or Fe doped CeO_2 solid solutions, which were obtained by sol-gel method. The experiment results showed that the incorporation of Cu or Fe into the fluorite lattice of CeO_2 strongly enhanced the oxidation activity of the catalyst. At 90 ℃ and 0.1 MPa, H acid conversion was 70% for the Ce0.9Fe0.1O2-δ and 60% for the Ce0.9Cu0.1O2-δ catalyst. For phenol removal, the conversion was 70% for the Ce0.9Cu0.1O2-δ catalyst, while for the Ce0.9Fe0.1O2-δ the conversion was 30%. The results indicated that Ce0.9Cu0.1O2-δ was suitable for the treatment of organic wastewaters while Ce0.9Fe0.1O2-δ was suitable for the removal of H acid. The 70% phenol removal rate with Ce0.9Cu0.1O2-δ catalyst was markedly increased to 90% with Ce0.8Cu0.2O2-δ catalyst. However, the phenol removal reduced from 30% to 15% with Fe content increasing from 10% to 20%. For the H acid, the increase of the content of Cu or Fe tended to obviously increase the original reaction rate while the COD removal changed little.展开更多
基金supported by the grants from the Natural Science Foundation of Zhejiang Province (Y406309)Research Program from Science and Technology Bureau of Jinhua City (2008-1-151)
文摘Eu2+ and (or) Eu3+ doped Sr2SiO4 phosphors particles were synthesized by a conventional solid-state reaction technique, and their structural and optical properties were investigated. The X-ray diffraction (XRD) results showed that the obtained phosphors were composed of orthorhombic α'-Sr2SiO4 and monoclinic β-Sr2SiO4 phase. When excited under 256 nm, Sr2SiO4:Eu3+ phosphors showed intense emission in the red region. Sr2SiO4:Eu3+ phosphors exhibited white emissions (x=0.30, y=0.40, TC=6500 K) ranging from 425 to 650 nm when it was excited by near-ultraviolet (near-UV) light, indicating that Sr2SiO4:Eu2+ was a good light-conversion phosphor candidate for near-UV chip.
基金supported by the Zhejiang Provincial Natural Science Foundation (Y407020)the Qianjiang Talent Program of Zhejiang Province (QJD0702098)Xinmiao Talent Program of Zhejiang Province (2007R40G2030045)
文摘MnOx-CeO2 composite catalysts were prepared by a coprecipitation method and tested for formaldehyde(HCHO) and carbon monoxide(CO) oxidation. X-ray photon spectroscopy(XPS) results indicated that the average oxidation state of surface Mn species in CeMn composite catalyst was higher compared to the pure MnOx. The enhancement of reactivity for HCHO oxidation was due to the activation of the lattice oxygen species in MnOx by the addition of CeO2,which was confirmed by the H2 temperature programmed reduction(H2-TPR) results. The remarkable enhancement of reactivity for CO oxidation by the addition of CeO2 was due to the active oxygen species generated on the CeO2 surface which directly participated in the reaction.
文摘Transference of CuO species and thermal solid-solid interaction in CuO/CeO2-Al2O3 catalyst prepared by an impregnation method were characterized by in-situ XRD, Raman spectroscopy and H2-TPR techniques. For the catalyst calcined at 300 ℃, two kinds of CuO species coexist on the surface, that is, highly dispersed and bulk CuO crystalline phase. Four kinds of CuO species are present for the catalyst calcined at 600 ℃: （1） highly dispersed CuO, （2） bulk CuO on the surface, （3） bulk CuO in the internal layer of CeO2, and （4） CuAl2O4 formed from CuO-Al2O3 interaction. For the catalyst calcined at 800 ℃, besides very little highly dispersed and bulk CuO on the surface, most of the CuO has transferred into the internal layer of CeO2 and the mass of CuAl2O4 are increased. At 900 ℃, all of CuO has diffused into the internal layer of CeO2 and formed CuAl2O4. The results show that the distribution of CuO species in the catalysts depends on the calcination temperature; the different CuO species can be effectively confirmed by in-situ XRD, Raman spectroscopy and H2-TPR techniques.
基金the Natural Science Foundation of Zhejiang Province (Z404383)
文摘The Ce0.7Zr0.3O2 solid solution and CeO2 were prepared using the sol-gel method. The phase structure, crystallite sizes and the re- ducibility of the catalysts were characterized by XRD and H2-TPR techniques. XRD results indicated that Zr4+ had replaced part of Ce4+ to form a fluorite-like solid solution, which was favorable to obtain ultrafine nanoparticles. The ratio of main H2 consumption for Ce0.7Zr0.3O2:CeO2 was 4.4:1.0, implying that the solid solution could improve the reducibility compared to the single CeO2. The Ce0.7Zr0.3O2 solid solution catalyst showed a sharp combustion peak at 397 oC, which was 200 oC lower than that of the single soot. The good catalytic ac- tivity of the Ce0.7Zr0.3O2 was attributed to the formation of nano-CeO2-based solid solution, which enhanced the reducibility and then im- proved the combustion activity. As Ce0.7Zr0.3O2 could be easily reduced to Ce0.7Zr0.3O2-x, meanwhile, after oxygenation, the Ce0.7Zr0.3O2-x was recovered to Ce0.7Zr0.3O2 completely. A catalytic combustion reaction mechanism was proposed: the Ce0.7Zr0.3O2 was reduced to Ce0.7Zr0.3O2-x by the reaction with carbon and then it was recovered to Ce0.7Zr0.3O2-x by the interaction with O2.
基金the Natural Science Foundation of China (Grant 20473075)
文摘Novel CexY1–xO washcoats adhered on the cordierite honeycomb, used as supports for Pd catalysts, were prepared by an impregnation method. It was found that the CexY1–xO washcoats had better adhesion and higher adsorption efficiency of H2PdCl4, and the optimal component of the washcoat was Ce0.8Y0.2O. Model reaction of catalytic combustion of toluene was chosen to evaluate the performance of the developed Pd/CexY1–xO/substrate catalysts. The results showed that the catalytic performance of the Pd/CexY1–xO/substrate catalysts depended on the component of the washcoats, with the Pd/Ce0.8Y0.2O/ substrate catalyst giving the best catalytic activity and thermal stability.
文摘The CexTh1-xO2 solid solutions were prepared by citrate sol-gel method, and their structure and reduction properties were studied. XRD shows that solid solution with cubic phase formed in all the solid solutions （x = 0.2, （0.5, 0.8） ）CexTh1-xO2. Raman spectrum shows that Ce-Th complex oxides can promote the formation of oxygen vacancies. Two reduction peaks appear in the TPR profiles of Cex Th1-xO2 solid solution. The α peak is attributed to the reduction of Ce4+ on the surface, and the β peak is attributed to the reduction of bulk CeO2. The incorporation of Th atom into CeO2 improves the reduction of CeO2. CexTh1-xO2 mixed oxides are promising materials for oxygen vacancies produced, as well as catalysts for many reactions involved oxygen, such as the catalysts for three-way reactions for reducing the releasing pollutants or combustion of VOCs.
基金supported by the grants from the Research Initiation Funds for the Doctor of Zhejiang Normal University (ZC304008169)the National Natural Science Foundation of China (21003108)
文摘A detailed study on the synergetic effect of TeMo5O16 and MoO3 phases in the MoTeOx catalysts for the partial oxidation of propylene to acrolein has been reported in this work. It was found that both propylene conversion and acrolein selectivity increased with the addition of MoO3 to TeMo5O16. Based on the results of N2 adsorption-desorption, XRD, XPS, in-situ XRD, O2-TPO, and 2-propanol decomposition reaction, the higher catalytic performance and synergetic effect could be attributed to the enhancement of acidity and the oxygen transfer from TeMo5O16 to MoO3 phase.
基金supported by the grants from the Nature Science Foundation of Zhejiang Province (Y406309)Research Program from Science and Technology Bureau of Jinhua City (2008-1-151)
文摘Y2O3:Er3+ films were prepared by a simple sol-gel process. The structural properties of Y2O3:Er3+ films were characterized with X-ray diffraction,Fourier transform infrared spectroscopy and field emission scanning electron microscopy. The results indicated that the Y2O3:Er3+ films might have high upconversion efficiency because of their low vibrational energy. Under 785 and 980 nm laser excitation,the samples showed green(2H11/2→4I15/2,4S3/2→4I15/2) and red(4F9/2→4I15/2) upconversion emissions. The upconversion mechanisms were studied in detail through laser power dependence. Excited state absorption and energy transfer process were discussed as possible upconversion mechanisms. The cross relaxation process in Er3+ was also investigated.
基金Project supported by the National Natural Science Foundation of China (20473075)
文摘The high-surface area nano-CeO2 was prepared by Ce(NO3)3 by precipitation method, with surfactant cetyltrimethyl ammonium bromide (CTAB) as templating agent. The effects of the precipitating agents, reaction temperature, ageing time, and calcination temperature on the surface area, as well as the pore structure and the mean crystallite size of nano-CeO2 were studied. It was found that the reaction of Ce(NO3)3 with NaOH in the presence of CTAB at 90 ℃ for 12 h yieldsed a cerium oxide/surfactant mixture, which after calcination at 400 ℃ resulted in high-surface area nano-CeO2. The mean crystallite size of CeO2 was approximately 6 nm, surface area was in excess of 200 m2·g-1, pore size was approximately 9 nm, and the pore distribution was concentrative. Moreover, the surface area can still reach 147 m2·g-1 after calcination at 700 ℃, which showed the good thermal stability of the CeO2. The number of oxygen vacancies in the structure of CeO2 corresponded with the surface area of CeO2, and the high surface area was propitious to the formation of oxygen vacancies.
基金Project supported by Zhejiang Provincial Natural Science Foundation of China (203147)the National Natural Science Foundation of China (20473075)
文摘Two novel washcoats Ce0.8Zr0.15La0.05Oδ and Ce0.8Zr0.2O2 was prepared by an impregnation method, which acted as a host for the active Pd component to prepare Pd/Ce0.8Zr0.15La0.05Oδ/substrate and Pd/Ce0.8Zr0.2O2/substrate monolithic catalysts for toluene combustion. The washcoats was characterized by X-ray diffraction (XRD), Raman spectroscopy, Brunauner-Emmett-Teller (BET), and H2-temperature-programmed reduction (H2-TPR). The result indicated that both the washcoats had strong vibration-shock resistance according to ultrasonic test. Doping La3+ into CeO2-ZrO2 solid solution could generate more oxygen vacancies, and could inhibit the sinter of CeO2-ZrO2 solid solution when calcined at high temperatures (800, 900 and 1000 °C). The washcoat Ce0.8Zr0.15La0.05Oδ had much better redox properties. The reductive temperature of Ce4+ species shifted to low temperature by 60 °C when the washcoats calcined at high temperatures (800, 900 and 1000 °C). The Pd/Ce0.8Zr0.15La0.05Oδ/substrate monolithic catalyst calcination at 500 °C had the best catalytic activity and the 95% toluene conversion at a temperature as low as 190 °C. When calcined at low temperature (500 and 700 °C), the catalytic activity has little improvement, however, when calcined at high temperature, the catalytic activity of Pd/Ce0.8Zr0.15La0.05Oδ/substrate monolithic catalysts had significant improvement. As catalyst washcoat, the Ce0.8Zr0.15La0.05Oδ had better thermal stability than the washcoat Ce0.8Zr0.2O2, the developed Pd/Ce0.8Zr0.15La0.05Oδ/ substrate monolithic catalyst in this work was promising for eliminating Volatile organic compounds.
文摘Three complexes, [Pr（NO3）3（HL）2] （1）, [Nd（NO3）3（HL）2] （2） and [Er（NO3）3（HL）2]·0.5H2O （3）, were synthesized from the reaction of a Schiff base ligand 2-[（4-methylphenylimino）methyl]-6-methoxyphenol （C 15H 15NO2, HL） with Ln（NO3）3·6H2O （Ln=Pr, Nd, Er）. Characterization by single-crystal X-ray diffraction technique, elemental analysis, molar conductance, FT-IR, UV-Vis, 1H NMR and thermal analysis shows the title complexes are neutral molecules where the central Ln（Ⅲ） ion is ten-coordinated in biapical anti-hexahedron prism geometry, with four oxygen atoms of the phenolic hydroxy and methoxy groups in the two bidentate Schiff base ligands and six oxygen atoms provided by the three bidentate NO3- anions. Additionally, the kinetic mechanism of thermal decomposition of complex 3 was determined with a TG-DTG curves by both integral and differential methods. The functions of thermal decomposition reaction mechanism and the equation of kinetic compensation effect were obtained.
文摘Two new zinc(II) complexes, [Zn2L2Cl4]·2[ZnL(CH3OH)Cl2] 1 and [ZnL2(NO3)2] 2, were synthesized by reacting ZnX2·nH2O (X = Cl-, NO3-) and a Schiff base ligand 2-[(4-me- thylphenylimino)methyl]-6-methoxyphenol (C15H15NO2, L) which was obtained by the condensation of o-vanillin (2-hydroxy-3-methoxybenzaldehyde) with p-toluidine. Both 1 and 2 were characterized by single-crystal X-ray diffraction technique, elemental analysis, molar conductance, FT-IR, UV-Vis, 1H-NMR spectra and thermogravimetric analysis. The Schiff base ligand and its zinc(II) complexes have been tested in vitro to evaluate their antibacterial activity against bacteria, viz., Escherichia Coli, Staphylococcus aureus and Bacillus Subtilis. The results show that these complexes have higher activity than the corresponding free Schiff base ligand against the same bacteria.
文摘The title complex, Zn(C14H13NO)2Cl2 1, has been synthesized by the reaction of zinc chloride with Schiff base ligand N-salicylidene-p-toluidine and its structure was determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group Cc with a = 14.896(3), b = 12.506(2), c = 15.352(3) ?, β = 114.711(4)o, V = 2598.0(8) ?3, C28H26ZnCl2N2O2, Mr = 558.80, Z = 4, Dc = 1.429 g/cm3, μ = 1.179 mm-1, Flack parameter = 0.027(19), F(000) = 1152, R = 0.0709 and wR = 0.1041 for 3117 observed reflections (I > 2σ(I)). In complex 1, the center Zn ion is four-coordinated by two O atoms from two Schiff base ligands and two Cl atoms in a distorted tetrahedral geometry. Additionally, the thermal decomposition of complex 1 as well as its kinetic mechanisms and equations is studied under the non-isothermal integral and differential methods in air by TG-DTG curves.
基金supported by the National Natural Science Foundation of China (20802061)Natural Science Foundation of the Education Committee of Jiangsu Province (08KJD150019)Qinglan Project (08QLT001) of the Education Committee of Jiangsu Province
文摘The title compound 9-(2-hydroxy-5-nitrophenyl)-9H-dibenzo[c,h]-2,7,10-trioxan-thene-1,8-dione DMF solvate (C28H20N2O9,Mr=528.46) was synthesized and crystallized.The crystal belongs to the triclinic system,space group P1 with a=10.210(3),b=10.698(4),c=12.522(4),α=92.214(6),β=113.751(5),γ=105.040(5)°,Z=2,V=1193.0(7)3,Dc=1.471 g·cm-3,μ(MoKα)=0.112 mm-1,F(000)=548,R=0.0444 and wR=0.1141 for 2667 observed reflections (I > 2σ(I)).X-ray analysis reveals that atoms C(1),C(2),C(3),C(4),C(5) and O(1) on the new 4H-pyran ring are slightly distorted,forming a half-chair conformation.
文摘The title complex Zn(HL)(NCS)2 (C14H18N4OS2Zn, Mr = 387.81, HL = N-(3-di-methyl-aminopropyl)-salicylaldimine) has been synthesized by the reaction of ZnSO4·7H2O with the Schiff base N-(3-dimethylaminopropyl)-salicylaldimine derived from the condensation reaction of 3-dimethylamino-1-propylamine with salicyladehyde. It crystallizes in the monoclinic system, space group P21/n with a = 9.8360(8), b = 14.930(1), c = 12.277(1) , ( = 101.455(2)o, V = 1767.0(3) 3, Z = 4, F(000) = 800, Dc = 1.458 g/cm3 and ((MoK() = 1.631 mm-1. The structure was refined to R = 0.0463 and wR = 0.1065 for 2681 observed reflections (I > 2((I)). Crystal analyses revealed that the Zn(II) atom is coordinated by two nitrogen atoms of two NCS-, and an oxygen atom as well as a nitrogen atom of amine from the neutral Schiff base ligand of N-(3-dimethyl-aminopropyl)-sali-cylaldimine to give a distorted tetrahedral geometry.
基金supported by the National Natural Science Foundation of China(21372136)
文摘Two new diaryquioxaline derivatives, C21H10N2S3Br2 (1) and C21H10Br2N2OS2(2), have been successfully synthesized. These two compounds have been determined by single-crystal X-ray diffraction analyses. Compound 1 crystallizes in monoclinic system, space group P21/n with a = 12.7896(3), b = 6.0613(2), c = 26.1153(7) A,β= 94.1810(10)°, V = 2018.(97) A^3, Z = 4, C21H10N2S3Br2, Mr = 546.32, Dc = 1.797 g/cm^3 and F(000)= 1072. The final R = 0.0343 and wR = 0.785 for 3585 observed reflections with I> 2σ(I). Compound 2 crystallizes in monoclinic system, space group P2x/n with a = 7.8638(4), b = 14.3447(7), c = 17.8936(8) A, β = 96.6980(10)°, V = 2004.69(17) A3, Z = 4, C21H10Br2N2OS2, Mr = 530.25, Dc = 1.757 g/cm^3 and F(000)= 1040. The final R = 0.0988 and wR = 0.1108 for 4613 observed reflections with I > 2σ(I). By combination of diarylquinoxaline core and a 1,3-dithiole-2-thione unit, compound 1 is used as "turn on" chemosensors for Hg^2+by making use of the aggregation-induced emission (AIE) feature of diarylquinoxaline core and the specific reaction of 1,3-dithiole-2-thione with Hg^2+.
基金The work was supported by the Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces (No. 0506) and the University of Malaya (F0712/2005c)
文摘The title compound, [Cu2(CH3COO)4(C8H10N2)]n·nCH3CN 1 (C8H10N2, 4,4-bipy = 4,4-bipyridine), has been solvothermally synthesized in CH3CN and characterized by X-ray diffraction. The crystal is of monoclinic, space group Cc with a = 22.626(6), b = 14.012(4), c = 15.106(4) ?, β = 107.610(3)o, V = 4565(2) 3, C20H23Cu2N3O8, Mr = 560.49, Z = 8, Dc = 1.631 g/cm3, μ = 1.914 mm-1, Flack parameter = 0.48(1), F(000) = 2288, R = 0.042 and wR = 0.098 for 8887 observed reflections (I > 2σ(I)). It consists of nearly linear one-dimensional chains [Cu2(CH3COO)4(C8H10N2)]n derived from paddle-wheel [Cu2(CH3COO)4] unit linked by 4,4?-bipy, and CH3CN as guest molecule regularly decorates between the chains.
基金This study was supported by the grant of 2004C31053 from the Ministry of Science and Technology of Zhejiang Province, China, and the grant of Y404305 from the Natural Science Foundation of Zhejiang Province, Chinathe grant of 20673101, 20673102 from National Natural Science Foundation of China.
文摘Partial oxidation of methane to syngas(POM)over Rh/SiO_2 catalyst was investigated using in-situ FT-IR.When methane interacted with 1.0wt%Rh/SiO_2 catalyst,it was dissociated to adsorbed hydrogen and CH_x species.The adsorbed hydrogen atoms were transferred to SiO_2 surface by"spill-over"and reacted with lattice oxygen to form surface -OH species. POM mechanism was investigated over Rh/SiO_2 catalyst using in-situ FT-IR.It was found that CO_2 was formed before CO could be detected when CH_4 and O_2 were introduced over the preoxidized Rh/SiO_2 catalyst,whereas CO was detected before CO_2 was formed over the prereduced Rh/SiO_2 catalyst.
文摘The catalytic wet air oxidation (CWAO) of H acid and phenol was investigated in the presence of Cu or Fe doped CeO_2 solid solutions, which were obtained by sol-gel method. The experiment results showed that the incorporation of Cu or Fe into the fluorite lattice of CeO_2 strongly enhanced the oxidation activity of the catalyst. At 90 ℃ and 0.1 MPa, H acid conversion was 70% for the Ce0.9Fe0.1O2-δ and 60% for the Ce0.9Cu0.1O2-δ catalyst. For phenol removal, the conversion was 70% for the Ce0.9Cu0.1O2-δ catalyst, while for the Ce0.9Fe0.1O2-δ the conversion was 30%. The results indicated that Ce0.9Cu0.1O2-δ was suitable for the treatment of organic wastewaters while Ce0.9Fe0.1O2-δ was suitable for the removal of H acid. The 70% phenol removal rate with Ce0.9Cu0.1O2-δ catalyst was markedly increased to 90% with Ce0.8Cu0.2O2-δ catalyst. However, the phenol removal reduced from 30% to 15% with Fe content increasing from 10% to 20%. For the H acid, the increase of the content of Cu or Fe tended to obviously increase the original reaction rate while the COD removal changed little.
