A series of CeO2/SiO2 and SixCe1-xO2 complex oxides supported on an activated Al2TiO5-TiO2-SiO2 complex phase (ATS) ceramics were prepared by step impregnation and co-impregnation methods, and characterized by N2-BET,...A series of CeO2/SiO2 and SixCe1-xO2 complex oxides supported on an activated Al2TiO5-TiO2-SiO2 complex phase (ATS) ceramics were prepared by step impregnation and co-impregnation methods, and characterized by N2-BET, XRD, SEM and NH3-TPD techniques. The effects of reaction temperature, CeO2/SiO2 loadings and Si/Ce molar ratio on the granular catalysts for NO selective catalytic reduction with ammonia (NH3-SCR) were studied. Results indicated that both CeO2/SiO2/ATS and CeO2/ATS catalysts showed the same active temperature window of 250-300 oC, mainly depending on the chemical composition of ceria. Moreover, the SixCe1-xO2/ATS catalysts exhibited higher activity and stability than those of CeO2/SiO2/ATS, and the Si0.75Ce0.25O2 represented the highest activity of 88.70% at 300 oC and the broadest active temperature window of 250-400 oC. Furthermore, the NH3-SCR of NO over the SixCe1-xO2 complex oxide catalysts was a result from synergetic catalysis between the acid catalysis and the redox catalysis.展开更多
Catalytic wet air oxidation(CWAO)is one of the most promising technologies for pollution abatement.Developing catalysts with high activity and stability is crucial for the application of the CWAO process.The Mn/Ce com...Catalytic wet air oxidation(CWAO)is one of the most promising technologies for pollution abatement.Developing catalysts with high activity and stability is crucial for the application of the CWAO process.The Mn/Ce com-plex oxide catalysts for CWAO of high concentration phenol-containing wastewater were prepared by coprecipitation.The catalyst preparation conditions were optimized by using an orthogonal layout method and single-factor experimental analysis.The Mn/Ce serial catalysts were characterized by Brunauer-Emmett-Teller(BET)analysis and the metal cation leaching was measured by inductively coupled plasma torch-atomic emission spectrometry(ICP-AES).The results show that the catalysts have high catalytic activities even at a low temperature(80°C)and low oxygen partial pressure(0.5 MPa)in a batch reactor.The metallic ion leaching is comparatively low(Mn<6.577 mg/L and Ce<0.6910 mg/L,respectively)in the CWAO process.The phenol,COD_(Cr),and TOC removal efficiencies in the solution exceed 98.5%using the optimal catalyst(named CSP).The new catalyst would have a promising application in CWAO treatment of high concentration organic wastewater.展开更多
The experimental and calculated data on the existence of complex oxides in solid state with the octahedral structures of four families,namely perovskites,Bi-containing layered perovskite-like ones,tetragonal tungsten ...The experimental and calculated data on the existence of complex oxides in solid state with the octahedral structures of four families,namely perovskites,Bi-containing layered perovskite-like ones,tetragonal tungsten bronzes and pyrochlores,and about their phase transitions are systematized and summarized on the basis of the quasi-elastic or geometric models of these structures.It has been established that similar existence areas and similar correlations between the interatomic bond strains in their structures,on the one hand,and the temperatures of their ferroelectric or antiferroelectric phase transitions,on the other hand,are observed for all of them,despite the differences in the compositions and structures of these oxides,but taking into account their similar parameters.展开更多
A series of 3 -trichlorostannylpropionate complexes with dibutylsulfoxide and pyridine oxide were synthesized by transesterification reaction and characterized by means of elemental analysis, IR, NMR(1H,13C) and X-ray...A series of 3 -trichlorostannylpropionate complexes with dibutylsulfoxide and pyridine oxide were synthesized by transesterification reaction and characterized by means of elemental analysis, IR, NMR(1H,13C) and X-ray single crystal diffraction.展开更多
Scaled-up industrial water electrolysis equipment that can be used with abundant seawater is key for affordable hydrogen production.The search for highly stable,dynamic,and economical electrocatalysts could have a sig...Scaled-up industrial water electrolysis equipment that can be used with abundant seawater is key for affordable hydrogen production.The search for highly stable,dynamic,and economical electrocatalysts could have a significant impact on hydrogen commercialization.Herein,we prepared energy-efficient,scalable,and engineering electronic structure modulated Mn-Ni bimetal oxides(Mn_(0.25)Ni_(0.75)O)through simple hydrothermal followed by calcination method.As-optimized Mn_(0.25)Ni_(0.75)O displayed enhanced oxygen and hydrogen evolution reaction(OER and HER)performance with overpotentials of 266 and115 mV at current densities of 10 mA cm^(-2)in alkaline KOH added seawater electrolyte solution.Additionally,Mn-Ni oxide catalytic benefits were attributed to the calculated electronic configurations and Gibbs free energy for OER,and HER values were estimated using first principles calculations.In real-time practical application,we mimicked industrial operating conditions with modified seawater electrolysis using Mn_(0.25)Ni_(0.75)O‖Mn_(0.25)Ni_(0.75)O under various temperature conditions,which performs superior to the commercial IrO_(2)‖Pt-C couple.These findings demonstrate an inexpensive and facile technique for feasible large-scale hydrogen production.展开更多
The coan cbargr transfer (CCT) absorption spectra of isopropyl ether , phenyl isopropyl ether and benzyl isopropyl ether with oxygen were measured . The mechanism of the initial dark oxidation of different ethers via ...The coan cbargr transfer (CCT) absorption spectra of isopropyl ether , phenyl isopropyl ether and benzyl isopropyl ether with oxygen were measured . The mechanism of the initial dark oxidation of different ethers via ether-O2 CCT was展开更多
It was found that the oxovanadium(V) complex of triethanolamine (TEA) exhibits catalytic activity to the oxidative cleavage of catechols. On the other hand. the vanadyl nitrilotriacetic acid (NTA) complex is inactive....It was found that the oxovanadium(V) complex of triethanolamine (TEA) exhibits catalytic activity to the oxidative cleavage of catechols. On the other hand. the vanadyl nitrilotriacetic acid (NTA) complex is inactive. but leads to the formation of stable ternary complex. The main products of the catalytic oxidative cleavage of 3.5-di-tert-butylcatechol were separated and characterized. Based on the results. a reaction mechanism was展开更多
The two-dimensional electron gas at SrTiO_3-based heterointerfaces has received a great deal of attention in recent years owing to their potential for the exploration of emergent physics and the next generation of ele...The two-dimensional electron gas at SrTiO_3-based heterointerfaces has received a great deal of attention in recent years owing to their potential for the exploration of emergent physics and the next generation of electronics. One of the most fascinating aspects in this system is that the light, as a powerful external perturbation, can modify its transport properties. Recent studies have reported that SrTiO3-based heterointerfaces exhibit the persistent photoconductivity and can be tuned by the surface and interface engineering. These researches not only reveal the intrinsic physical mechanisms in the photoresponsive process, but also highlight the ability to be used as a tool for novel all-oxide optical devices. This review mainly contraposes the studies of photoresponse at SrTiO_3-based heterointerfaces.展开更多
Epitaxial PrBaCo_(2)O_(5+δ)(PBCO,0≤δ≤1)thin films were deposited by pulsed laser deposition.The structural and electrical properties of the films were characterized at high temperatures in reduced environments.X-r...Epitaxial PrBaCo_(2)O_(5+δ)(PBCO,0≤δ≤1)thin films were deposited by pulsed laser deposition.The structural and electrical properties of the films were characterized at high temperatures in reduced environments.X-ray diffraction scans at high temperature in reduced environment show potential structural transitions of PBCO as evidenced by both a large(Dl=0.335 nm)expansion of the out-plane(caxis)lattice,due to thermal and chemical expansion,and a step in the expansion of the c-axis lattice parameter.These transitions indicate the presence of oxygen vacancy ordering as the oxygen content in the films is reduced.Resistivity measurements under the same environments also show evidence of sharp transitions related with the structural transformations.This study helps the understanding of the structure-property relationship of PBCO at high temperature and provides important technological information to utilize these materials for solid oxide fuel cell at intermediate temperatures.展开更多
基金Project supported by the National High-Tech Research and Development Program of China (2009AA05Z313)National Natural Science Foundation of China (50872052)Foundation of Jiangsu Province of China for College Postgraduate Students in Innovation Engineering (CX07B_083z)
文摘A series of CeO2/SiO2 and SixCe1-xO2 complex oxides supported on an activated Al2TiO5-TiO2-SiO2 complex phase (ATS) ceramics were prepared by step impregnation and co-impregnation methods, and characterized by N2-BET, XRD, SEM and NH3-TPD techniques. The effects of reaction temperature, CeO2/SiO2 loadings and Si/Ce molar ratio on the granular catalysts for NO selective catalytic reduction with ammonia (NH3-SCR) were studied. Results indicated that both CeO2/SiO2/ATS and CeO2/ATS catalysts showed the same active temperature window of 250-300 oC, mainly depending on the chemical composition of ceria. Moreover, the SixCe1-xO2/ATS catalysts exhibited higher activity and stability than those of CeO2/SiO2/ATS, and the Si0.75Ce0.25O2 represented the highest activity of 88.70% at 300 oC and the broadest active temperature window of 250-400 oC. Furthermore, the NH3-SCR of NO over the SixCe1-xO2 complex oxide catalysts was a result from synergetic catalysis between the acid catalysis and the redox catalysis.
基金This work was supported by the National High-Tech Research and Development Program of China(Grant No.2002AA601260)。
文摘Catalytic wet air oxidation(CWAO)is one of the most promising technologies for pollution abatement.Developing catalysts with high activity and stability is crucial for the application of the CWAO process.The Mn/Ce com-plex oxide catalysts for CWAO of high concentration phenol-containing wastewater were prepared by coprecipitation.The catalyst preparation conditions were optimized by using an orthogonal layout method and single-factor experimental analysis.The Mn/Ce serial catalysts were characterized by Brunauer-Emmett-Teller(BET)analysis and the metal cation leaching was measured by inductively coupled plasma torch-atomic emission spectrometry(ICP-AES).The results show that the catalysts have high catalytic activities even at a low temperature(80°C)and low oxygen partial pressure(0.5 MPa)in a batch reactor.The metallic ion leaching is comparatively low(Mn<6.577 mg/L and Ce<0.6910 mg/L,respectively)in the CWAO process.The phenol,COD_(Cr),and TOC removal efficiencies in the solution exceed 98.5%using the optimal catalyst(named CSP).The new catalyst would have a promising application in CWAO treatment of high concentration organic wastewater.
基金Research was financially supported by the Ministry of Science and Higher Education of the Russian Federation(State assignment in the field of scientific activity,Southern Federal University,2020).
文摘The experimental and calculated data on the existence of complex oxides in solid state with the octahedral structures of four families,namely perovskites,Bi-containing layered perovskite-like ones,tetragonal tungsten bronzes and pyrochlores,and about their phase transitions are systematized and summarized on the basis of the quasi-elastic or geometric models of these structures.It has been established that similar existence areas and similar correlations between the interatomic bond strains in their structures,on the one hand,and the temperatures of their ferroelectric or antiferroelectric phase transitions,on the other hand,are observed for all of them,despite the differences in the compositions and structures of these oxides,but taking into account their similar parameters.
文摘A series of 3 -trichlorostannylpropionate complexes with dibutylsulfoxide and pyridine oxide were synthesized by transesterification reaction and characterized by means of elemental analysis, IR, NMR(1H,13C) and X-ray single crystal diffraction.
基金supported by the GEONJI Research support programsupported by Basic Science Research through the National Research Foundation of Korea(NRF)funded by the Ministry of Education(NRF-2021R1I1A1A01050905)+1 种基金supported by grants from the Medical Research Center Program(NRF-2017R1A5A2015061)through the National Research Foundation(NRF),which is funded by the Korean government(MSIP)supported by Basic Science Research Program through the National Research Foundation of Korea(NRF)funded by the Ministry of Science,ICT and Future Planning(NRF-2020R1A2B5B01001458)。
文摘Scaled-up industrial water electrolysis equipment that can be used with abundant seawater is key for affordable hydrogen production.The search for highly stable,dynamic,and economical electrocatalysts could have a significant impact on hydrogen commercialization.Herein,we prepared energy-efficient,scalable,and engineering electronic structure modulated Mn-Ni bimetal oxides(Mn_(0.25)Ni_(0.75)O)through simple hydrothermal followed by calcination method.As-optimized Mn_(0.25)Ni_(0.75)O displayed enhanced oxygen and hydrogen evolution reaction(OER and HER)performance with overpotentials of 266 and115 mV at current densities of 10 mA cm^(-2)in alkaline KOH added seawater electrolyte solution.Additionally,Mn-Ni oxide catalytic benefits were attributed to the calculated electronic configurations and Gibbs free energy for OER,and HER values were estimated using first principles calculations.In real-time practical application,we mimicked industrial operating conditions with modified seawater electrolysis using Mn_(0.25)Ni_(0.75)O‖Mn_(0.25)Ni_(0.75)O under various temperature conditions,which performs superior to the commercial IrO_(2)‖Pt-C couple.These findings demonstrate an inexpensive and facile technique for feasible large-scale hydrogen production.
文摘The coan cbargr transfer (CCT) absorption spectra of isopropyl ether , phenyl isopropyl ether and benzyl isopropyl ether with oxygen were measured . The mechanism of the initial dark oxidation of different ethers via ether-O2 CCT was
文摘It was found that the oxovanadium(V) complex of triethanolamine (TEA) exhibits catalytic activity to the oxidative cleavage of catechols. On the other hand. the vanadyl nitrilotriacetic acid (NTA) complex is inactive. but leads to the formation of stable ternary complex. The main products of the catalytic oxidative cleavage of 3.5-di-tert-butylcatechol were separated and characterized. Based on the results. a reaction mechanism was
基金Project supported by the National Natural Science Foundation of China(Grant Nos.51572222 and 11604265)Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University,China(Grant No.CX201836)
文摘The two-dimensional electron gas at SrTiO_3-based heterointerfaces has received a great deal of attention in recent years owing to their potential for the exploration of emergent physics and the next generation of electronics. One of the most fascinating aspects in this system is that the light, as a powerful external perturbation, can modify its transport properties. Recent studies have reported that SrTiO3-based heterointerfaces exhibit the persistent photoconductivity and can be tuned by the surface and interface engineering. These researches not only reveal the intrinsic physical mechanisms in the photoresponsive process, but also highlight the ability to be used as a tool for novel all-oxide optical devices. This review mainly contraposes the studies of photoresponse at SrTiO_3-based heterointerfaces.
基金This research was partially supported by the National Institute on Minority Health and Health Disparities of the National Institutes of Health under Award Number G12MD007591This work was performed,in part,at the Center for Integrated Nanotechnologies,an Office of Science User Facility operated for the U.S.Department of Energy(DOE)Office of Science.Los Alamos National Laboratory,an affirmative action equal opportunity employer,is operated by Los Alamos National Security,LLC,for the National Nuclear Security Administration of the U.S.Department of Energy under contract DE-AC52-06NA25396.
文摘Epitaxial PrBaCo_(2)O_(5+δ)(PBCO,0≤δ≤1)thin films were deposited by pulsed laser deposition.The structural and electrical properties of the films were characterized at high temperatures in reduced environments.X-ray diffraction scans at high temperature in reduced environment show potential structural transitions of PBCO as evidenced by both a large(Dl=0.335 nm)expansion of the out-plane(caxis)lattice,due to thermal and chemical expansion,and a step in the expansion of the c-axis lattice parameter.These transitions indicate the presence of oxygen vacancy ordering as the oxygen content in the films is reduced.Resistivity measurements under the same environments also show evidence of sharp transitions related with the structural transformations.This study helps the understanding of the structure-property relationship of PBCO at high temperature and provides important technological information to utilize these materials for solid oxide fuel cell at intermediate temperatures.
