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Chinese Journal of Catalysis
2009, Vol. 30, No. 5
Online: 25 May 2009

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In Situ Monitoring of the Oxygen Activity on a Mg2V2O7 Catalyst during the Oxidative Dehydrogenation of Propane JI Baofeng;WANG Jibo;CHU Wenling;ZHU Xuefeng;YANG Weishen;*;LIN Liwu 2009, 30 (5):  375-377.  Abstract ( 2045 )   [Full Text(HTML)] () PDF (366KB) ( 935 )   Oxygen activity oscillations were observed by a solid state electrolyte potentiometry method on a Mg2V2O7 catalyst at 500 oC in oxidative dehydrogenation of propane. When the catalyst was exposed to different atmospheres, the periods of oscillations were the same, 2.4 s. The adsorption and activation of propane needed 2.4 s, and the reduction and oxidization processes only spent the remanent 0.4 s.

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The Promoting Effect of Ga2O3 on a Pt/WO3/ZrO2 Catalyst for n-Heptane Isomerization TU Xingjun;YUE Yinghong;WANG Jie;ZHAI Dewei;HUA Weiming*;GAO Zi 2009, 30 (5):  378-380.  Abstract ( 2402 )   [Full Text(HTML)] () PDF (369KB) ( 1085 )   The incorporation of small amounts of Ga2O3 into Pt/WO3/ZrO2 increases the activity substantially and improves the isomerization selectivity to some extent for n-heptane hydroisomerization. Pt/WO3/Ga2O3-ZrO2 gave a constant catalytic activity at 200 oC for over 80 h with a high n-C7 conversion (76%) and C7 isomer selectivity (94%).

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Pt/La-Ba-Al2O3/H-ZSM-5 Catalyst for Treating Hydrogen-Powered Vehicle Ex-haust ZHENG Lingmin;LIU Zhimin;ZHU Qingchao;LI Yile;YU Quanwei;CHEN Yaoqiang;GONG Maochu* 2009, 30 (5):  381-383.  Abstract ( 2137 )   [Full Text(HTML)] () Pt/La-Ba-Al2O3 and Pt/La-Ba-Al2O3/H-ZSM-5 catalysts showed high N2 selectivity (SN2) from 106 to 506 篊 in treating the exhaust from hydrogen-powered vehicles. SN2 increased with increasing temperature, and SN2 over Pt/La-Ba-Al2O3/H-ZSM-5 was higher than that over Pt/La-Ba-Al2O3. The Pt/La-Ba-Al2O3/H-ZSM-5 catalyst gave enhanced SN2.

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A First-Principle Study on Size-Dependent Thermodynamic Properties of Small TiO2 Nanoclusters WENG Meng-Hsiung;CHEN Chuan;JU Shin-Pon;* 2009, 30 (5):  384-390.  Abstract ( 2149 )   [Full Text(HTML)] () PDF (5615KB) ( 1052 )   The thermodynamics properties of TinO2n (n = 1–6) nanoparticles are investigated by first-principle molecular dynamics simulation. The configurations for TinO2n (n = 1–6) nanoparticles with global minimum energies can be first obtained by molecular dynamics simulation combining the FIRE algorithm. These structures were further refined by the density functional theory simulation. The effect of size and geometry on the thermodynamics properties of TiO2 nanoparticles was also found.

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Studies on the Initial Transient Period of Heterogeneous Asymmetric Catalytic Hydrogenation of Ethyl Pyruvate TAO Guozhong;LU Guanzhong*;GUO Yun;WANG Yanqin;GUO Yanglong;ZHANG Zhigang;LIU Xiaohui;WANG Yunsong 2009, 30 (5):  391-395.  Abstract ( 2113 )   [Full Text(HTML)] () PDF (424KB) ( 879 )   The asymmetric hydrogenation of ethyl pyruvate over a quinine-modified Pt/Al2O3 catalyst was studied under atmospheric pressure in acetic acid. The quinine modifier concentration, reaction temperature, pre-modification time, and initial substrate concentration affect the character of the initial transient period (ITP). The pre-conditioning of O2 for the catalyst can increase the enantioselectivity of product and improve the ITP phenomenon.

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Addition of Diethylzinc to Aromatic Aldehydes Catalyzed by Hydrolase WEI Xiaofei;ZHENG Qingchuan;JI Tengfei;ZHAO Bo;LI Chunyuan;WANG Ping;CAO Shugui;WANG Zhi;#;WANG Lei;* 2009, 30 (5):  396-400.  Abstract ( 2181 )   [Full Text(HTML)] () PDF (1049KB) ( 823 )   A novel application of hydrolase as catalyst for the addition of diethylzinc to aromatic aldehydes is reported, and a possible mechanism is proposed based on experimental observations and molecular dynamics simulation. The present observations extend the phenomenon of enzyme promiscuity.

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A Brønsted-Lewis Acidic Ionic Liquid: Its Synthesis and Use as the Catalyst in Rosin Dimerization LIU Shi-Wei, JIE Cong-Xia, YU Shi-Tao, XIAN Mo, LIU Fu-Sheng 2009, 30 (5):  401-406.  Abstract ( 2561 )   [Full Text(HTML)] () PDF (384KB) ( 1101 )   Brønsted-Lewis acidic ionic liquids 1-(3-sulfonic acid)-propyl-3-methylimidazole chlorozincinates ([HO3S-(CH2)3-mim]Cl-ZnCl2) were synthesized, characterized, and used to catalyze the dimerization of rosin. [HO3S-(CH2)3-mim]Cl-ZnCl2 (molar fraction of ZnCl2 x > 0.5) is both Brønsted and Lewis acidic, and [HO3S-(CH2)3-mim]Cl-ZnCl2 (x = 0.64) has good catalytic properties. The product can be easily separated from the reaction mixture, and the ionic liquid catalyst has good reusability.

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Preparation and Characterization of Ce0.67Zr0.33O2 and the Activity of Its Sup-ported Only-Pd Three-Way Catalysts ZHAO Bo;WANG Qiuyan;GE Changhua;LI Guangfeng;ZHOU Renxian;* 2009, 30 (5):  407-413.  Abstract ( 2202 )   [Full Text(HTML)] () PDF (557KB) ( 1039 )   This investigation focused on the effect of preparation methods for only-Pd/ Ce0.67Zr0.33O2 catalysts on the three-way reaction performance. The results showed that preparation methods have great effect on the support properties. The PdO species on Ce0.67Zr0.33O2 prepared by the co-precipitation method exhibited high reducibility before and after aging. The only-Pd catalysts have excellent three-way catalytic activity.

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p-Nitrophenol Hydrogenation over a Novel Ni/TiO2 Catalyst WANG Haitang;ZHU Yinhua;YANG Zhuhong;LIU Jinlong;SUN Qingjie;LU Xiaohua*;FENG Xin 2009, 30 (5):  414-420.  Abstract ( 2289 )   [Full Text(HTML)] () PDF (2695KB) ( 1795 )   A novel mesoporous Ni/TiO2 catalyst with whisker morphology and high surface area was prepared by incipient impregnation. Because of its special meso-structure, Ni/TiO2 showed high activity, selectivity, and stability in the hydrogenation of p-nitrophenol. The catalyst can be separated from reaction solution under self-gravity conditions. Thus, it has very good prospects for industrial applications.

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Oxidation of Carbon Monoxide over a Fibrous Titania-Supported Gold Catalyst ZHU Yinhua;CHEN Shanshan;LU Xiaohua;*;YANG Zhuhong;FENG Xin;WANG Huaiyuan 2009, 30 (5):  421-425.  Abstract ( 1897 )   [Full Text(HTML)] () PDF (4805KB) ( 1422 )   Fibrous titania prepared from a potassium dititanate whisker precursor was used as the gold catalyst support for CO oxidation. The fibrous titania calcined at 600 oC had a mesoporous structure, whereas the meso-structure totally collapsed when calcined at 800 oC. Disparate gold particle sizes and gold-titania interface areas resulted in the comparative catalytic performance for Au/TiO2(600 oC) and Au/TiO2(800 oC).

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Preparation and Photocatalytic Activity of Macro-Mesoporous N-Doped TiO2 JING Wenheng;WANG Weigang;XING Weihong* 2009, 30 (5):  426-432.  Abstract ( 2262 )   [Full Text(HTML)] () PDF (14257KB) ( 906 )   Macro-mesoporous N-doped TiO2 photocatalysts were directly prepared by a sol-gel technique with a block copolymer as template and formamide as solvent. The microstructure, band gap, and photocatalytic activity of the materials were mainly affected by the concentration of the template. When its concentration was 11%, the band gap was 2.76 eV, and the degradation of methyl orange reached 93.2% after 120 min.

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Density Functional Theory Study on the Mechanism for Enhanced Activity of PdxNi/C Catalysts WANG Liang;WANG Yi;SONG Shuqin*;SHEN Peikang# 2009, 30 (5):  433-439.  Abstract ( 2289 )   [Full Text(HTML)] () PDF (3772KB) ( 1522 )   By introducing Ni atoms, the out layer electrons of the Pd cluster become more easily to transit from the d sub-orbital of Pd to the p orbital of O2 and pass more charge to oxygen. The more charge the oxygen owns, the longer the bond length becomes, and more easily for the O–O bond to break up. Thus, oxygen reduction reaction activity is enhanced.

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Preparation and Photocatalytic Activity of Porphyrin-Sensitized TiO2 Micro-spheres CAI Jinhua;HUANG Jinwang;*;YE Yuanjian;YU Hancheng ;JI Liangnian 2009, 30 (5):  440-446.  Abstract ( 2087 )   [Full Text(HTML)] () PDF (666KB) ( 1002 )   Novel porphyrin-sensitized TiO2 microspheres (APTCPP-MPS- TiO2) were prepared by a sol-gel method and characterized. The photooxidation of α-terpinene was used to evaluate the photocatalytic activity of APTCPP-MPS-TiO2 microspheres under visible light. The microspheres had excellent catalytic activity and stability.

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Shape-Controlled Synthesis of Nickel Wires Using an External Magnetic Field ZHANG Meng;DENG Jia;ZHANG Minghui;LI Wei* 2009, 30 (5):  447-452.  Abstract ( 2246 )   [Full Text(HTML)] () PDF (7149KB) ( 1280 )   One-dimensional nickel wires were synthesized by a hydrothermal method assisted by an external magnetic field. The morphology of the obtained nickel samples could be controlled by adding CTAB into the hydrothermal system as a coating agent. The as-prepared samples with different surface structures exhibit different magnetic properties and catalytic performance in hydrogenation.

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heoretical Study on Alkylation of Benzene with Ethanol and Ethylene over H-ZSM-5 NIE Xiaowa;LIU Xin;SONG Chunshan;GUO Xinwen;* 2009, 30 (5):  453-458.  Abstract ( 2975 )   [Full Text(HTML)] () PDF (916KB) ( 2246 )   With the help of DFT calculations, the reaction mechanisms of benzene alkylation with ethanol and ethylene have been studied. The alkylation of benzene with ethanol occurs via the stepwise mechanism. Alkylation of benzene with ethylene occurs through both concerted mechanism and stepwise mechanism. These two paths are only slightly different in the activation energy.

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Promotional Mechanism of Sulfation on Selective Catalytic Reduction of NOx by Methane Over In/SO42–/TiO2 JING Guohua;;LI Junhua;*;YANG Dong;HAO Jiming 2009, 30 (5):  459-464.  Abstract ( 2298 )   [Full Text(HTML)] () PDF (496KB) ( 1053 )   The catalytic performance and the promotional mechanism of sulfation on selective catalytic reduction of NO by CH4 over sulfated titanium-loaded In (In/STi) were investigated. An enhancement of catalytic activity was obtained over the In/STi catalysts. The distinguish reaction intermediates of CH4-SCR of NO over the sulfated and unsulfated catalysts were revealed by DRIFTS analysis.

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Effects of an Improved Dehydration Way on Structural Properties and Fischer-Tropsch Synthesis Performance of an Iron-Based Catalyst YU Weiqi;WU Baoshan;*;WANG Hong;WANG Hulin;XIANG Hongwei;LI Yongwang 2009, 30 (5):  465-470.  Abstract ( 2277 )   [Full Text(HTML)] () PDF (844KB) ( 875 )   The improved dehydration way makes the catalyst structure changing from a primarily irregular state to a relatively uniform one, which increased the catalyst activity for the Fischer-Tropsch synthesis .

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Effect of Rhenium Component and Preparation Methods of ZrO2 Support on Catalytic Performance of Ru-Re/ZrO2 for Glycerol Hydrogenolysis MA Lan;HE Dehua;* 2009, 30 (5):  471-478.  Abstract ( 2060 )   [Full Text(HTML)] () PDF (4556KB) ( 1404 )   ZrO2 supports were prepared by different methods, and Ru/ZrO2 and Ru-Re/ZrO2 catalysts were prepared using these ZrO2 supports. The influence of addition of Re species and preparation methods of the ZrO2 support on the catalytic performance of Ru/ZrO2 catalysts for glycerol hydrogenolysis was investigated. The results showed that the promoting effect of addition of Re on catalytic performance of Ru/ZrO2 was obvious, and preparation methods of the ZrO2 support had some influences on the catalyst activity.