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Chinese Journal of Catalysis
2009, Vol. 30, No. 7
Online: 25 July 2009

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Chiral Diamine/Br鴑sted Acid Conjugates Confined in Mesoporous Silica as Catalyst for the Asymmetric Aldol Reaction LI Hua;Lv Xiaobing* 2009, 30 (7):  587-589.  Abstract ( 2004 )   [Full Text(HTML)] () PDF (412KB) ( 824 )   Chiral primary-tertiary diamine/Br鴑sted acid conjugates were selectively immobilized on the inner surface of SBA-15, yielding a heterogeneous catalyst showing a 74% yield and 78% ee in the asymmetric aldol reaction of acetone and p-nitrobenzaldehyde.

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Hydrogen Peroxide Decomposition Catalyzed by Ti-MWW in a Fixed-Bed Re-actor YAO Mingkai;YANG Junxia;ZHAO Song;LIU Yueming*;WU Peng 2009, 30 (7):  590-594.  Abstract ( 2228 )   [Full Text(HTML)] () PDF (417KB) ( 1133 )   H2O2 decomposition in the Ti-MWW/H2O2 system is a competitive reaction against the main oxidation reaction in which H2O2 as the oxygen donor is transferred to hydrocarbons. To improve the utilization of H2O2, the titanosilicate molecular sieve catalyst without non-framework Ti species and acid centers are preferred. Optimizing reaction parameters, especially H2O2WHSV, is another key.

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Aqueous-Phase Reforming of Ethylene Glycol to H2 on Sn-Modified Rapidly Quenched Skeletal Ni-Mo Catalyst CHU Xianwen;LIU Jun;QIAO Minghua;*;ZHUANG Jihua;*;FAN Kangnian;ZHANG Xiaoxin;ZONG Baoning 2009, 30 (7):  595-600.  Abstract ( 2266 )   [Full Text(HTML)] () PDF (523KB) ( 1010 )   Addition of Sn to rapidly quenched skeletal Ni-Mo remarkably improved the H2 production rate and selectivity in aqueous-phase reforming (APR) of ethylene glycol. The H2 selectivity reached 98.7% at high conversion of ethylene glycol while the formation of alkanes was substantially suppressed.

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Effects of Alkali Metal Cations on Catalytic Oxidation Performance of Fe(phen)3/Y XIA Feng;LIU Zhaomin;FAN Binbin;LI Ruifeng* 2009, 30 (7):  601-605.  Abstract ( 2559 )   [Full Text(HTML)] () PDF (517KB) ( 875 )   The Fe(phen)3 complex was successfully encapsulated inside the cavities of zeolite Y with different ion-exchanged alkali metal cations (Li+, Na+, K+, and Cs+) by the flexible ligand method. Fe(phen)3 loading correlates to the different alkali metal cations, and the roles of the alkali metal cations on the catalytic performance of Fe(phen)3/M-Y are the integrated results of electric effects, space steric constraints, and diffusion effects.

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Hydrogenation of Nitro Compounds Catalyzed by Urushibara Nickel Catalysts LIU Hao;LI Ruoyu;ZHANG Meng;LI Wei*;ZHANG Minghui;TAO Keyi 2009, 30 (7):  606-612.  Abstract ( 2393 )   [Full Text(HTML)] () PDF (1995KB) ( 1285 )   The Urushibara nickel catalysts were prepared by reducing nickel chloride with Zn powder followed by treatment of the precipitated nickel with a base or an acid. Particle size distribution of Zn power had significant influence on the catalyst activity. The Urushibara nickel catalysts exhibited high catalytic activity and selectivity for m-phenylenediamine and 2,5-dichloroaniline.

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Preparation of Alumina-Supported Co-Mo Bimetallic Nitride Catalysts by Co-precipitation ZHANG Xinbo;XU Liyong;YUAN Junfeng;ZHANG Yajuan;LU Chunshan;LI Xiaonian;* 2009, 30 (7):  613-618.  Abstract ( 2704 )   [Full Text(HTML)] () PDF (4448KB) ( 1742 )   The alumina-supported Co-Mo bimetallic oxide precursor was prepared by coprecipitation of ethanolic solution of Al(NO3)3 and Co(NO3)2, and aqueous solution of (NH4)2CO3 and (NH4)6Mo7O24. The precursor was then reduced to Co-Mo bimetallic nitride catalyst by NH3 temperature-programmed reaction. This nitride catalyst has higher activity, higher crystal stability, and more uniform dispersion of the active components than the sample prepared by impregnation.

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Oxidative Dehydrogenation of Ethylbenzene with CO2 over Iron Oxide-Based Catalysts CHEN Guili;CHEN Xin;WANG Xinkui;HE Min;JI Min*;CAI Tianxi 2009, 30 (7):  619-623.  Abstract ( 2392 )   [Full Text(HTML)] () PDF (401KB) ( 921 )   Different states of Fe species in Fe2O3-MgO/Al2O3, Fe2O3/MgAl2O4, and MgFe0.1Al1.9O4 catalysts with the same content of Mg, Fe, and Al showed extremely different catalytic performance in ethylbenzene dehydrogenation with CO2. Highly dispersed Fe2O3 in Fe2O3/MgAl2O4 deactivated rapidly, whereas Fe3+ that incorporated into the spinel framework of MgFe0.1Al1.9O4 exhibited high activity and good stability.

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The Sintering of a Cu-Based Methanol Synthesis Catalyst ZUO Yizan;ZHANG Qiang;HAN Minghan*;WANG Jinfu;WANG Tiefeng;WANG Dezheng;JIN Yong 2009, 30 (7):  624-630.  Abstract ( 2769 )   [Full Text(HTML)] () PDF (8306KB) ( 1362 )   The sintering rate of the Cu/Zn/Al/Zr methanol synthesis catalyst increased at high temperature. Equation k1/k10 = A×t–B can be used to describe the deactivation process. At low sintering temperature, surface migration and coalescence of catalyst particles were the main deactivation mechanism. With increasing sintering temperature, there was a larger contribution from atomic gas phase transfer to catalyst deactivation.

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Preparation of High Specific Surface Area MgO by a Gel-Templating Route MA Li;JIANG Ping;SUN Ruiqin;CHUN Yuan*;XU Qinhua 2009, 30 (7):  631-636.  Abstract ( 2373 )   [Full Text(HTML)] () PDF (1444KB) ( 1009 )   MgO with high specific surface area was prepared using a new gel-templating route, in which a gel mixture was formed by heating rice powder in Mg(CH3COO)2?H2O solution followed by calcination in oxygen to remove the template. It contains more strong basic sites and less acidic sites and exhibits higher basic catalytic performance compared to MgO from thermal decomposition of the precursor.

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Effect of La2O3 on a Precipitated Iron Catalyst for Fischer-Tropsch Synthesis ZHAO Lili;LIEW Kongyong;LI Jinlin* 2009, 30 (7):  637-642.  Abstract ( 2326 )   [Full Text(HTML)] () PDF (952KB) ( 876 )   With increasing La2O3 content in the precipitated iron Fischer-Tropsch synthesis catalyst, the formation of iron carbides was first favored and then inhibited. Accordingly, the catalyst activity increased first and then decreased dramatically. The optimum La2O3 content is La/Fe = 0.01.

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Catalytic Performance of Ti-MCM-41 for Styrene Oxidation CHEN Dandan;LI Niankai;SUN Peng;KONG Yan* 2009, 30 (7):  643-648.  Abstract ( 2249 )   [Full Text(HTML)] () PDF (1210KB) ( 1335 )   The increasing titanium content in the framework or on the surface of Ti-MCM-41 catalyst led to the different regular variation of the structure parameters and the catalytic activity in the direct oxidation of styrene by hydroperoxide. Organic compounds with adequate polarity such as acetonitrile were the preferred solvent.

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Preparation and Performance of Ce-Pt-Pd/Stainless Steel Wire Meshes Catalyst CHEN Min*;MA Ying;SONG Cui;ZHANG Ting;ZHENG Xiaoming 2009, 30 (7):  649-653.  Abstract ( 2077 )   [Full Text(HTML)] () PDF (2029KB) ( 1149 )   A new type of Ce-Pt-Pd/stainless steel wire meshes catalyst was prepared and employed for catalytic deep oxidation of toluene, acetone, and ethyl acetate. The results show that using stainless steel wire meshes as support via anodic oxidation treatment and the addition of CeO2 enhance the catalytic activity and stability.

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Density Functional Theory Study on the Photocatalytic Degradation of Mer-capto-Azobenzene Carboxylic Acids with Different Substituents Catalyzed by TiO2 LUO Shixia;ZHANG Siting;ZHANG Xiaoyi;*;ZHU Huaiwu;HU Jiwei;WEI Gang;* 2009, 30 (7):  654-658.  Abstract ( 2609 )   [Full Text(HTML)] () PDF (415KB) ( 1150 )   With the introduction of an electron-withdrawing group into the mercapto-azobenzene carboxylic acids, the reactivity of TiO2-catalyzed photocatalytic degradation of these acids rises.

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Preparation of Au/Ti-SBA-15 Catalysts and Their Catalytic Performance for CO Oxidation SU Jixin;*;MA Liyuan;ZHANG Shenping;YIN Jing;QU Wen;DING Yi 2009, 30 (7):  659-665.  Abstract ( 2275 )   [Full Text(HTML)] () PDF (3696KB) ( 1178 )   Tin-SBA-15 (n = 1, 2, 3) with layers of –Ti–O groups was prepared by vapor-solid surface modification on SAB-15. Au was deposited and Au particles were limited in the mesoporous channels. Au/Tin-SBA-15 exhibited a wide range of catalytic activity (50–500 oC) for CO oxidation, excellent storage stability, and cycle reproducibility.

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Effect of Rare Earth Oxide on the Catalytic Performance of Au/CeO2 Catalyst for Water-Gas Shift Reaction YANG Shenyong;ZHAN Yingying;CHEN Chongqi;CAO Yanning;LIN Xingyi;ZHENG Qi* 2009, 30 (7):  666-672.  Abstract ( 2208 )   [Full Text(HTML)] () PDF (817KB) ( 936 )   Au/CeO2-RE2O3 (RE = Nd, Eu, Sm, Y) catalysts prepared by deposition- precipitation for water-gas shift reaction were studied, especially, the Au/CeO2- Y2O3 catalysts with different Y2O3 loadings. The catalyst with Ce/Y molar ratio = 35 shows the best catalytic activity and stability because of its unique structural stability and oxygen vacancies.

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Characterization of Key Amino Acid Residues in Active Sites of Inulinase from Bacillus smithii T7 by Chemical Modification LIU Bin;WANG Jingyun*;BAO Yongming;ZHANG Fan;AN Lijia 2009, 30 (7):  673-678.  Abstract ( 3228 )   [Full Text(HTML)] () PDF (432KB) ( 1175 )   Chemical modification demonstrated that one histidine and one carboxylate residues in the active site of endo-inulinase from Bacillus smithii T7 play a key role in the catalytic function. Two tryptophan residues are necessary for the enzyme activity and are also important for the enzyme’s thermal stability.

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Degradation of Azo Dye Wastewater in a TiO2 Photocatalysis and Membrane Separation Hybrid System ZHANG Hui;ZHANG Guoliang*;YANG Zhihong;CHEN Jinyuan;NI Lijia 2009, 30 (7):  679-684.  Abstract ( 2677 )   [Full Text(HTML)] () PDF (443KB) ( 1514 )   Nano-titania was prepared by an improved acid-sol method at low temperature (<100 oC). The granularity of TiO2 in aqueous solution was significantly influenced by initial pH according to the zeta potential theory. This induced the variation of photocatalytic activity and TiO2 rejection in the photocatalytic membrane reactor and therefore provided a basis for pore size selection of membrane.

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Ce-Al Mixed Oxide with High Thermal Stability for Diesel Soot Combustion SUN Shumin;CHU Wenling;*;YANG Weishen;# 2009, 30 (7):  685-689.  Abstract ( 2274 )   [Full Text(HTML)] () PDF (446KB) ( 891 )   There is a strong interaction between CeO2 and Al2O3 in the Ce-Al mixed oxide. Some aluminum can be incorporated into the CeO2 lattice to change the lattice oxygen mobility. The existence of -Al2O3 improved the thermal stability of CeO2 as a “diffusion barrier”, which induced a higher catalytic activity for the mixed oxide compared to pure CeO2.

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Hydrocracking of Tar Components from Hot Coke Oven Gas over a Ni/Ce-ZrO2/γ-Al2O3 Catalyst at Atmospheric Pressure YU Fei;YUE Baohua;WANG Xueguang;*;GENG Shuhua;LU Xionggang;DING Weizhong;# 2009, 30 (7):  690-696.  Abstract ( 2461 )   [Full Text(HTML)] () PDF (2723KB) ( 1384 )   Ni/Ce-ZrO2/γ-Al2O3 catalysts were used for the hydrocracking of toluene and naphthalene as model tar compounds in hot coke oven gas and showed excellent catalytic activity, stability, and some sulfur tolerance.

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Optimization of Metal Ratio and CO Desorption Behavior of Rh-Mn-Li/SiO2 Catalyst for CO Hydrogenation JIANG Dahao;DING Yunjie;*;Lv Yuan;ZHU Hejun;CHEN Weimiao;WANG Tao;YAN Li;LUO Hongyuan 2009, 30 (7):  697-703.  Abstract ( 2376 )   [Full Text(HTML)] () PDF (743KB) ( 1078 )   A highly efficient Rh-Mn-Li/SiO2 catalyst was developed by optimization of its metal ratio when Rh loading was fixed at 1.5%, which proved to be the optimum Rh loading. CO-TPD and TPSR were employed to characterize the effects of Mn and Li with various loadings on the catalytic performance of the Rh-based catalyst for CO hydrogenation.