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Gas-solid catalytic reactions over ruthenium-based catalysts 被引量:4
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作者 施文博 刘霄龙 +3 位作者 曾俊淋 王健 魏耀东 朱廷钰 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第8期1181-1192,共12页
Ruthenium (Ru)‐based catalysts are widely employed in several types of gas‐solid reactions because of their high catalytic activities. This review provides theoretical research on Ru‐based catalysts and an analys... Ruthenium (Ru)‐based catalysts are widely employed in several types of gas‐solid reactions because of their high catalytic activities. This review provides theoretical research on Ru‐based catalysts and an analysis of their basic properties and oxidation behavior. There is particular emphasis on Ru‐catalyzed gas‐solid catalytic reactions, including the catalytic oxidation of VOCs, preferential oxidation of CO, synthesis of ammonia, oxidation of HCl and partial oxidation of CH4. Recent litera‐ture on catalysis is summarized and compared. Finally, we describe current challenges in the field and propose approaches for future development of Ru‐based catalysts. 展开更多
关键词 Gas-solid catalytic reaction RUTHENIUM Volatile organic compound catalytic oxidation Preferential CO oxidation HCl oxidation
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THE SYNTHESES OF POLYQUINOLINES WITH 2,2'-PYRIDYLQUINOLINE AND 2,6-DIQUINOLYLPYRIDINE AS LIGAND AND THEIR APPLICATIONS IN SOME CATALYTIC REACTIONS
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作者 丁孟贤 TOHNK.STILLE 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1989年第4期360-366,共7页
The polyquinolines with 2,2'-pyridylquinoline as bidentate and 2,6-diquinolylpyridine as tridentate ligand have been prepared from 4,4-dlamino- 3,3'-dibenzoyldiphenyl ether, 4,4'-diacetyldiphenyl ether and... The polyquinolines with 2,2'-pyridylquinoline as bidentate and 2,6-diquinolylpyridine as tridentate ligand have been prepared from 4,4-dlamino- 3,3'-dibenzoyldiphenyl ether, 4,4'-diacetyldiphenyl ether and 1,4-bis (2-acetylpyridyl-6-oxy) benzene, 2,6-diacetylpyridine, respectively. These polyquinoline-supported ligands have been used in hydrogenation and hydroformylation of olefins with some transition metal complexes. 展开更多
关键词 PYRIDYLQUINOLINE AND 2 6-DIQUINOLYLPYRIDINE AS LIGAND AND THEIR APPLICATIONS IN SOME catalytic reactions THE SYNTHESES OF POLYQUINOLINES WITH 2 2
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Catalytically altering the redox pathway of sulfur in propylene carbonate electrolyte using dual-nitrogen/oxygen-containing carbon
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作者 Linghui Yu Heng Zhang +9 位作者 Luyuan Paul Wang Samuel Jun Hoong Ong Shibo Xi Bo Chen Rui Guo Ting Wang Yonghua Du Wei Chen Ovadia Lev Zhichuan J.Xu 《Chinese Journal of Catalysis》 SCIE CAS CSCD 2024年第8期224-233,共10页
Carbonate electrolytes are one of the most desirable electrolytes for high-energy lithium-sulfur batteries(LSBs)because of their successful implementation in commercial Li-ion batteries.The low-polysulfide-solubility ... Carbonate electrolytes are one of the most desirable electrolytes for high-energy lithium-sulfur batteries(LSBs)because of their successful implementation in commercial Li-ion batteries.The low-polysulfide-solubility feature of some carbonate solvents also makes them very promising for overcoming the shuttle effects of LSBs.However,regular sulfur electrodes experience undesired electrochemical mechanisms in carbonate electrolytes due to side reactions.In this study,we report a catalytic redox mechanism of sulfur in propylene carbonate(PC)electrolyte based on a compari-son study.The catalytic mechanism is characterized by the interactions between polysulfides and dual N/O functional groups on the host carbon,which largely prevents side reactions between polysulfides and the carbonate electrolyte.Such a mechanism coupled with the low-polysulfide-solubility feature leads to stable cycling of LSBs in PC electrolyte.Favorable dual N/O functional groups are identified via a density functional theory study.This work provides an alternative route for enabling LSBs in carbonate electrolytes. 展开更多
关键词 Energy storage Lithium-sulfur battery catalytic redox reaction Porous carbon Carbonate electrolyte
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Theranostic nanosystem mediating cascade catalytic reactions for effective immunotherapy of highly immunosuppressive and poorly penetrable pancreatic tumor 被引量:1
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作者 Gengjia Chen Yujun Cai +4 位作者 Bo Li Minzhao Lin Xiaobin Wang Zhiyong Wang Xintao Shuai 《Science China Chemistry》 SCIE EI CSCD 2022年第7期1383-1400,共18页
The dense desmoplastic stroma and immunosuppressive microenvironment of pancreatic cancer hinder the penetration of drugs and induce a considerable resistance to conventional chemoradiotherapy. Although nanomedicine h... The dense desmoplastic stroma and immunosuppressive microenvironment of pancreatic cancer hinder the penetration of drugs and induce a considerable resistance to conventional chemoradiotherapy. Although nanomedicine has recently shown attractive potential in cancer immunotherapy, it remains a great challenge to achieve efficient drug delivery and potent immune activation.Here, a stimuli-responsive nanosystem, comprising superparamagnetic iron oxide nanocrystals and nitric oxide(NO) donors,was developed for in-situ triggered catalytic cascade reaction to produce abundant free radicals and remodel the anti-tumor immunity. The nanosystem was activated in the tumor microenvironment to produce NO which dilated the tumor vasculature for efficient drug delivery, and the iron oxide nanocrystals catalyzed the reaction of NO to generate reactive oxygen-nitrogen species(RONS) with high cytotoxicity. Moreover, owing to the catalytic cascade reactions mediated by the nanosystem, the tumor associated macrophages(TAMs) were converted to a proinflammatory M1 phenotype and tumor infiltration of effector T cells was promoted to result in potent anti-tumor immunotherapy which could be readily monitored with magnetic resonance imaging(MRI). 展开更多
关键词 nanozyme catalytic cascade reactions MACROPHAGES tumor microenvironment nitric oxide
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Photothermal Catalytic Selective Oxidation of Isobutane to Methacrylic Acid over Keggin-Type Heteropolyacid
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作者 Yichuan Wang Xiao Sun +2 位作者 Zeyue Wei Xuanyu Zhang Weixin Huang 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2023年第5期497-502,I0001,共7页
Thermal and photothermal catalytic selec-tive oxidation of isobutane to methacrylic acid(MAA)are comparatively studied over a keggin-type Cs2.9Cu0.34V0.49PMo12O40 het-eropolyacid acid.An introduction of light was obse... Thermal and photothermal catalytic selec-tive oxidation of isobutane to methacrylic acid(MAA)are comparatively studied over a keggin-type Cs2.9Cu0.34V0.49PMo12O40 het-eropolyacid acid.An introduction of light was observed to enhance both the i-C4H10 conversion and the MAA selectivity,and consequently the MAA formate rate,particularly at low temperatures.Characterization re-sults show that oxidation of methacrolein(MAL)to MAA is the rate-limiting step while UV light illumination promotes the oxidation ofσ-bonded MAL with OH groups toσ-bonded MAA on the catalyst surface.These results demonstrate a synergistic effect of thermal cataly-sis and photocatalysis in selective oxidation of isobutane to MAA,which suggests photother-mal catalysis as a promising strategy to catalyze the selective oxidation of higher hydrocar-bons at relative mild reaction conditions. 展开更多
关键词 Photothermal catalytic reaction Thermal catalytic reaction Selection oxida-tion Reaction mechanism In situ characterization
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Ultralow charge-discharge voltage gap of 0.05 V in sunlight-responsive neutral aqueous Zn-air battery
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作者 Zhimin Niu Yan Gao +8 位作者 Tianhui Wu Fei Zhang Ran Zhao Zijia Chen Yiming Yuan Tifeng Jiao Jianmin Gu Li Lu Desong Wang 《Carbon Energy》 SCIE EI CAS CSCD 2024年第9期172-183,共12页
Rechargeable neutral aqueous zinc-air batteries(ZABs)are a promising type of energy storage device with longer operating life and less corrosiveness compared with conventional alkaline ZABs.However,the neutral ZABs no... Rechargeable neutral aqueous zinc-air batteries(ZABs)are a promising type of energy storage device with longer operating life and less corrosiveness compared with conventional alkaline ZABs.However,the neutral ZABs normally possess poor oxygen evolution reactions(OERs)and oxygen reduction reactions performance,resulting in a large charge–discharge voltage gap and low round-trip efficiency.Herein,we demonstrate a sunlight-assisted strategy for achieving an ultralow voltage gap of 0.05 V in neutral ZABs by using the FeOOH-decorated BiVO4(Fe-BiVO4)as an oxygen catalyst.Under sunlight,the electrons move from the valence band(VB)of Fe-BiVO_(4) to the conduction band producing holes in VB to promote the OER process and hence reduce the overpotential.Meanwhile,the photopotential generated by the Fe-BiVO_(4) compensates a part of the charging potential of neutral ZABs.Accordingly,the energy loss of the battery could be compensated via solar energy,leading to a record-low gap of 0.05 V between the charge and discharge voltage with a high round-trip efficiency of 94%.This work offers a simple but efficient pathway for solar-energy utilization in storage devices,further guiding the design of high energy efficiency of neutral aqueous ZABs. 展开更多
关键词 neutral ZABs oxygen catalytic reactions PHOTOCATALYSIS round-trip efficiency solar energy
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Study on the Performance and Commercial Application of New Generation DMMC-1 Type Catalyst for Deep Catalytic Cracking 被引量:2
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作者 Long Jun Tian Huiping +2 位作者 Liu Yujian Xie Chaogang Li Jibing 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2007年第4期1-6,共6页
Over the past decades SINOPEC has been uninterruptedly engaging in the development and upgrading of deep catalytic cracking (DCC) technology for manufacturing propylene from heavy oil. Recently SINOPEC after having ... Over the past decades SINOPEC has been uninterruptedly engaging in the development and upgrading of deep catalytic cracking (DCC) technology for manufacturing propylene from heavy oil. Recently SINOPEC after having made a lot of progress in the area of oil refining at the molecular level has developed a new generation DMMC-1 type catalyst designed for the DCC process. The laboratory evaluation tests have shown that compared to the existing MMC-2 type catalyst that features the best comprehensive performance, the DMMC-1 type catalyst has increased the propylene yield by 2.2% with the propylene selectivity increased by 10%. The said catalyst has improved its ability for heavy oil cracking and coke selectivity along with reduction of olefin content in gasoline to achieve a better product distribution and improve the product quality. The results of application of the said catalyst in a 650-kt/a commercial DCC unit at SINOPEC Anqing Branch Company have revealed that the DMMC- 1 catalyst demonstrated an enhanced capability for heavy oil cracking and could increase the total liquid yield to 84.56 m% from 83.92 m%, the LPG yield to 38.90 m % from 34.60 m %, the propylene yield to 17.80 m% from 15.37 m% and the propylene concentration to 45.91 m% from 44.91 m%, and reduce the coke yield from 7.61 m% to 7.05 m% and the olefin content in gasoline from 42.3 v% to 37.5 v%, resulting in an incremental profit amounting to 52.19 million RMB a year. This technology has further upgraded and developed the DCC technology which has been commanding a leading position among the industry peers. 展开更多
关键词 PETROCHEMICALS PROPYLENE DCC catalyst kinetics of catalytic reactions active site accessibility and availability
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CFD modeling of reaction and mass transfer through a single pellet: Catalytic oxidative coupling of methane 被引量:1
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作者 Siavash Seyednejadian Nakisa Yaghobi +1 位作者 Ramin Maghrebi Leila Vafajoo 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2011年第4期356-363,共8页
In this study a mathematical model of a small scale single pellet for the oxidative coupling of methane(OCM)over titanite pervoskite is developed.The method is based on a computational fluid dynamics(CFD)code whic... In this study a mathematical model of a small scale single pellet for the oxidative coupling of methane(OCM)over titanite pervoskite is developed.The method is based on a computational fluid dynamics(CFD)code which known as Fluent may be adopted to model the reactions that take place inside the porous catalyst pellet.The steady state single pellet model is coupled with a kinetic model and the intra-pellet concentration profiles of species are provided.Subsequent to achieving this goal,a nonlinear reaction network consisting of nine catalytic reactions and one gas phase reaction as an external program is successfully implemented to CFD-code as a reaction term in solving the equations.This study is based on the experimental design which is conducted in a differential reactor with a Sn/BaTiO3 catalyst(7-8 mesh) at atmospheric pressure,GHSV of 12000 h-1,ratio of methane to oxygen of 2,and three different temperatures of 1023,1048 and 1073 K.The modeling results such as selectivity and conversion at the pellet exit are in good agreement with the experimental data.Therefore,it is suggested that to achieve high yield in OCM process the modeling of the single pellet should be considered as the heart of catalytic fixed bed reactor. 展开更多
关键词 catalyst pellet oxidative coupling of methane modeling CFD catalytic reactions ETHANE
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Highly dispersed MgInCe-mixed metal oxides catalyzed direct carbonylation of glycerol and CO_(2)into glycerol carbonate
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作者 Xufang Chen Xin Shu +5 位作者 Yanru Zhu Jian Zhang Zhigang Chai Hongyan Song Zhe An Jing He 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第8期153-163,共11页
Glycerol carbonate,an important glycerol value-added product,has been widely used as an active intermediate and inert solvent in the synthesis of cosmetics,detergents,chemical intermediates,polymers,and so on.The dire... Glycerol carbonate,an important glycerol value-added product,has been widely used as an active intermediate and inert solvent in the synthesis of cosmetics,detergents,chemical intermediates,polymers,and so on.The direct carbonylation from glycerol with CO_(2)is considered a promising route,but still tough work due to the thermodynamic stability and the kinetic inertness of CO_(2).In this work,highlyselective direct carbonylation of glycerol and CO_(2)into glycerol carbonate has been achieved over highly dispersed MgInCe-mixed metal oxides(MgInCe-MMO),which were prepared through the topological transformation derived from the MgInCe-layered double hydroxides(MgInCe-LDHs).By precisely modulating the surface basic-acidic properties and the oxygen vacancies,an efficient carbonylation of glycerol with CO_(2)has been achieved with a selectivity of up to>99%to glycerol carbonate.Deep investigation into the synergistic catalysis of base-acid sites and oxygen vacancies has been clarified. 展开更多
关键词 catalytic reaction engineering Glycerol carbonate Direct carbonylation from glycerol Carbon dioxide Mixed metal oxides Synergistic catalysis
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Bimetallic CoNi single atoms supported on three-dimensionally ordered mesoporous chromia:highly active catalysts for n-hexane combustion
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作者 Xiuqing Hao Yuxi Liu +4 位作者 Jiguang Deng Lin Jing Jia Wang Wenbo Pei Hongxing Dai 《Green Energy & Environment》 SCIE EI CAS CSCD 2024年第7期1122-1137,共16页
Developing the alternative supported noble metal catalysts with low cost,high catalytic efficiency,and good resistance toward carbon dioxide and water vapor is critically demanded for the oxidative removal of volatile... Developing the alternative supported noble metal catalysts with low cost,high catalytic efficiency,and good resistance toward carbon dioxide and water vapor is critically demanded for the oxidative removal of volatile organic compounds(VOCs).In this work,we prepared the mesoporous chromia-supported bimetallic Co and Ni single-atom(Co_(1)Ni_(1)/meso-Cr_(2)O_(3))and bimetallic Co and Ni nanoparticle(Co_(NP)Ni_(NP)/mesoCr_(2)O_(3))catalysts adopting the one-pot polyvinyl pyrrolidone(PVP)-and polyvinyl alcohol(PVA)-protecting approaches,respectively.The results indicate that the Co_(1)Ni_(1)/meso-Cr_(2)O_(3)catalyst exhibited the best catalytic activity for n-hexane(C_(6)H_(14))combustion(T_(50%)and T_(90%)were 239 and 263℃ at a space velocity of 40,000 mL g^(-1)h^(-1);apparent activation energy and specific reaction rate at 260℃ were 54.7 kJ mol^(-1)and 4.3×10^(-7)mol g^(-1)_(cat)s^(-1),respectively),which was associated with its higher(Cr^(5+)+Cr^(6+))amount,large n-hexane adsorption capacity,and good lattice oxygen mobility that could enhance the deep oxidation of n-hexane,in which Ni_(1) was beneficial for the enhancements in surface lattice oxygen mobility and low-temperature reducibility,while Co_(1) preferred to generate higher contents of the high-valence states of chromium and surface oxygen species as well as adsorption and activation of n-hexane.n-Hexane combustion takes place via the Mars van Krevelen(MvK)mechanism,and its reaction pathways are as follows:n-hexane→olefins or 3-hexyl hydroperoxide→3-hexanone,2-hexanone or 2,5-dimethyltetrahydrofuran→2-methyloxirane or 2-ethyl-oxetane→acrylic acid→CO_x→CO_(2)and H_(2)O. 展开更多
关键词 Three-dimensional ordered mesoporous chromium oxide Supported bimetallic single-atom catalyst Cobalt-nickel single atoms n-Hexane combustion catalytic reaction mechanism
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Study on Direct Synthesis of Diphenyl Carbonate with Heterogeneous Catalytic Reaction (V) Screening Catalysts and Optimizing Synthesis Conditions 被引量:7
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作者 张光旭 吴元欣 +4 位作者 马沛生 田崎峰 吴广文 李定或 王存文 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2003年第5期526-530,共5页
Pd/LaxPbyMnOz, Pd/C, Pd/molecular sieve and Pd-heteropoly acid catalysts for direct synthesis of diphenyl carbonate (DPC) by heterogeneous catalytic reaction were compared and the results of DPC synthesis indicated th... Pd/LaxPbyMnOz, Pd/C, Pd/molecular sieve and Pd-heteropoly acid catalysts for direct synthesis of diphenyl carbonate (DPC) by heterogeneous catalytic reaction were compared and the results of DPC synthesis indicated that the catalyst Pd/LaxPbyMnOz had higher activity. The Pd/LaxPbyMnOz catalyst and the support was characterized by XRD, SEM and TEM, the main phase was Lao.szPbo.asMnOa and the average diameter could be about 25.4nm. The optimuna conditions for synthesis of DPC with Pd/LasPbyMnOz were determined by orthogonal experiments and the experimental results showed that reaction temperature was the first factor of effect on the selectivity and yield of DPC, and the concentration of O2 in gas phase also had significant effect on selectivity of DPC. The optimum reaction conditions were catalyst/phenol mass ratio l to 50, pressure 4.5MPa, volume concentration of O2 25%, reaction temperature 60℃ and reaction time 4 h. The maximum yield and average selectivity could reach 13% and 97% respectively in the batch operation. 展开更多
关键词 diphenyl carbonate supported catalyst heterogeneous catalytic reaction optimum conditions
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Microwave-induced synthesis and characterization of nanometer Ce_(0.5)Zr_(0.5)O_2 solid solution for the acidic catalytic reaction 被引量:1
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作者 HU Yucai YIN Ping LIANG Tao JIANG Wei DU Zhengkun CHEN Yonghua 《Rare Metals》 SCIE EI CAS CSCD 2008年第2期138-141,共4页
Ce0.5Zr0.5O2 solid solution was successfully synthesized using cerium nitrate, zirconium nitrate, and urea as raw materials by the microwave irradiation method and characterized by X-ray diffraction, fluorescence spec... Ce0.5Zr0.5O2 solid solution was successfully synthesized using cerium nitrate, zirconium nitrate, and urea as raw materials by the microwave irradiation method and characterized by X-ray diffraction, fluorescence spectrum, transmission electron microscopy, and infrared spectrum. Its acid catalytic activity was evaluated in the esterification reaction of acetic acid and n-butyl alcohol. The results show that Ce0.5Zr0.5O2 solid solution has cubic fluorite structure, and its particle diameter is in the nanometer scale. As a sort of solid acid, it possesses a higher acid catalytic activity and can be easily separated from reaction liquids. It can be used for several times, and basically, its activity keeps constant. The proton acid sites and Lewis acid sites exist in the structure of Ce0.5Zr0.5O2 solid solution. 展开更多
关键词 ceria-zirconia solid solution microwave-induced synthesis CHARACTERIZATION acidic catalytic reaction
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Kinetics of catalytically activated duplication in aggregation growth 被引量:1
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作者 王海锋 林振权 +1 位作者 高艳 胥超 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第8期3577-3584,共8页
We propose a catalytically activated duplication model to mimic the coagulation and duplication of the DNA polymer system under the catalysis of the primer RNA. In the model, two aggregates of the same species can coa... We propose a catalytically activated duplication model to mimic the coagulation and duplication of the DNA polymer system under the catalysis of the primer RNA. In the model, two aggregates of the same species can coagulate themselves and a DNA aggregate of any size can yield a new monomer or double itself with the help of RNA aggregates. By employing the mean-field rate equation approach we analytically investigate the evolution behaviour of the system. For the system with catalysis-driven monomer duplications, the aggregate size distribution of DNA polymers αk(t) always follows a power law in size in the long-time limit, and it decreases with time or approaches a time-independent steady-state form in the case of the duplication rate independent of the size of the mother aggregates, while it increases with time increasing in the case of the duplication rate proportional to the size of the mother aggregates. For the system with complete catalysis-driven duplications, the aggregate size distribution αk(t) approaches a generalized or modified scaling form. 展开更多
关键词 AGGREGATION catalytically activated reaction rate equation kinetic behavior
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HOMOGENEOUS CATALYTIC REACTION(EC')AT GENERATION/COLLECTION MICROELECIRODE
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作者 Guang Li CHE and Shao Jun DONGz Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Academia Sinica. Changchun 130022 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第5期441-444,共4页
A new type of macro-micro-macro triple electrode is fabricated. The kinetic equation is obtained by using the decrease in collection current to determine the kinetic constant of homogeneous catalytic reaction, the met... A new type of macro-micro-macro triple electrode is fabricated. The kinetic equation is obtained by using the decrease in collection current to determine the kinetic constant of homogeneous catalytic reaction, the method can be used to study homogeneous chemical reaction with any magnitude of kinetic constant, and overcomes the disadvantages that the microelectrode is only suitable for fast catalytic reaction. 展开更多
关键词 ACID 七公 AT GENERATION/COLLECTION MICROELECIRODE HOMOGENEOUS catalytic REACTION CN EC
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Evolution behavior of catalytically activated replication-decline in a coagulation process
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作者 高艳 王海锋 +3 位作者 张吉东 杨霞 孙茂珠 林振权 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第9期547-553,共7页
We propose a catalytically activated replication-decline model of three species, in which two aggregates of the same species can coagulate themselves, an A aggregate of any size can replicate itself with the help of B... We propose a catalytically activated replication-decline model of three species, in which two aggregates of the same species can coagulate themselves, an A aggregate of any size can replicate itself with the help of B aggregates, and the decline of A aggregate occurs under the catalysis of C aggregates. By means of mean-field rate equations, we derive the asymptotic solutions of the aggregate size distribution ak(t) of species A, which is found to depend strongly on the competition among three mechanisms: the self-coagulation of species A, the replication of species A catalyzed by species B, and the decline of species A catalyzed by species C. When the self-coagulation of species A dominates the system, the aggregate size distribution a^(t) satisfies the conventional scaling form. When the catalyzed replication process dominates the system, ak(t) takes the generalized scaling form. When the catalyzed decline process dominates the system, ak(t) approaches the modified scaling form. 展开更多
关键词 AGGREGATION catalytically activated reaction REPLICATION DECLINE
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Kinetics of catalytically activated aggregation-fragmentation process
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作者 高艳 王海锋 +1 位作者 林振权 薛新英 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第8期304-311,共8页
We propose a catalytically activated aggregation-fragmentation model of three species, in which two clusters of species A can coagulate into a larger one under the catalysis of B clusters; otherwise, one cluster of sp... We propose a catalytically activated aggregation-fragmentation model of three species, in which two clusters of species A can coagulate into a larger one under the catalysis of B clusters; otherwise, one cluster of species A will fragment into two smaller clusters under the catalysis of C clusters. By means of mean-field rate equations, we derive the asymptotic solutions of the cluster-mass distributions ak(t) of species A, which is found to depend strongly on the competition between the catalyzed aggregation process and the catalyzed fragmentation process. When the catalyzed aggregation process dominates the system, the cluster-mass distribution ak(t) satisfies the conventional scaling form. When the catalyzed fragmentation process dominates the system, the scaling description of ak (t) breaks down completely and the monodisperse initial condition of species A would not be changed in the long-time limit. In the marginal case when the effects of catalyzed aggregation and catalyzed fragmentation counteract each other, ak(t) takes the modified scaling form and the system can eventually evolve to a steady state. 展开更多
关键词 AGGREGATION FRAGMENTATION catalytically activated reaction rate equation
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Stodies on the Witting Reaction (Ⅹ Ⅹ Ⅻ) Phase Transfer Catalytic Bis-Witting Reaction of 1,2-and 1,3-Bisylide
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作者 Wen Jing XIAO Zi Long TANG +1 位作者 Ming Wu DING Wen Fang HUANG(Insititute of Organic Synthesis, Central China Normal University, Wuhan430070)Tian Jie WU(Center of Analysis and Testing, Central China Normal University, Wuhan430070) 《Chinese Chemical Letters》 SCIE CAS CSCD 1997年第5期361-364,共4页
The phase transfer catalytic (PTC) bis-Wittig reaction between substitutedbenzaldehyde and 1,2- and 1,3-bisylides in the presence of K2Co3 was discussed.
关键词 HNMR MS Phase Transfer catalytic Bis-Witting Reaction of 1 2-and 1 3-Bisylide Stodies on the Witting Reaction
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Methyl Ester Type Produced by Catalytic Transesterification:From Various Oil Feedstock to Biodiesel Products
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作者 Aman Santoso Sumari Sumari Muhammad Roy Asrori 《Energy Engineering》 EI 2022年第6期2255-2276,共22页
Biodiesel research has been carried out via transesterification.However,biodiesel products(methyl esters)have not encountered new insights,because feedstocks have been explored and studied.Various optimum conditions o... Biodiesel research has been carried out via transesterification.However,biodiesel products(methyl esters)have not encountered new insights,because feedstocks have been explored and studied.Various optimum conditions on transesterification reaction could produce different methyl ester type with different compound.So,this review describes various oil feedstock that were to find new insights about methyl ester type.The review took the results of study that has been published with experience for 10 years.The results of the study reviewed on the transesterification method,characterization of methyl esters,and its components.The component reviewed and correlated to the literature,structure,and GC-MS analysis.The review can provide challenges for methyl ester research in future research. 展开更多
关键词 BIODIESEL methyl ester TRANSESTERIFICATION FEEDSTOCK catalytic reaction
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Synthesis of 7,7’-Disubstituted BINAP and Their Application in Asymmetric Catalytic Reaction
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作者 Jiang Yao-Zhong Yuan Wei-Cheng +2 位作者 Liu Hua Mi Ai-Qiao Gong Liu-Zhu 《合成化学》 CAS CSCD 2004年第z1期32-32,共1页
关键词 diphosphine ligand asymmetric catalytic reaction enantioselectivity.
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CATALYTIC COLOR REACTION OF THE SYSTEM OF MIMETIC PEROXIDASE(Fe-T(3MPy)P)-LEUCO CRYSTAL VIOLET-HYDROGEN PEROXIDE
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作者 Shu Sheng SUN Xiao Wei WU An WANG Yun Xiang CI Department of Chemistry,Peking University,Beijing,100871 《Chinese Chemical Letters》 SCIE CAS CSCD 1992年第12期993-996,共4页
The mimetic peroxidase iron-tetrakis(3-N-methylpyridyl)- porphyrin (Fe-T(3MPy)P)can be used as a catalyst in the spectrophoto- metric determination of H_2O_2 and glucose.The method is based on the formation of crystal... The mimetic peroxidase iron-tetrakis(3-N-methylpyridyl)- porphyrin (Fe-T(3MPy)P)can be used as a catalyst in the spectrophoto- metric determination of H_2O_2 and glucose.The method is based on the formation of crystal violet from leuco crystal violet.The glucose in human serum is determined by this reaction combined with catalytic reaction of glucose oxidase. 展开更多
关键词 Fe-T catalytic COLOR REACTION OF THE SYSTEM OF MIMETIC PEROXIDASE LEUCO CRYSTAL VIOLET-HYDROGEN PEROXIDE
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