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Chinese Journal of Catalysis
2008, Vol. 29, No. 10
Online: 25 October 2008

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Influence of Cerium on the Stability of Copper-Based Oxychlorination Catalyst CHEN Zhitao;HAN Minghan*;WANG Dezheng;WEI Fei 2008, 29 (10):  951-953.  Abstract ( 1920 )   [Full Text(HTML)] () PDF (184KB) ( 966 )   The role of cerium in the copper-based catalyst in HCl oxychlorination was t o transfer oxygen during the reaction, which accelerated the rate-determining s tep. In the used catalyst reacted for 300 h, the main part of cerium reacted wit h the carrier to form an inert phase, which had no co-catalytic effect.

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Direct Methane Oxidation in the Absence of Gaseous Oxygen Using La0.8Sr0.2Fe0.9Co0.1O3 Perovskite Oxide as the Oxygen Carrier DAI Xiaoping;YU Changchun*;WU Qiong 2008, 29 (10):  954-956.  Abstract ( 2022 )   [Full Text(HTML)] () PDF (204KB) ( 929 )   Direct partial oxidation of methane to synthesis gas using La0.8Sr 0.2-Fe0.9Co0.1O3 oxide as the oxygen carrier was investigate d in a fixed-bed reactor. Methane can be selectively converted to synthesis gas , and the oxygen species can be replenished by gaseous oxygen in redox reaction. The production of synthesis gas by sequential redox cycles over the La0. 8Sr0.2Fe0.9Co0.1O3 perovskite oxide was possible.

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Synthesis of a Basic Imidazolide Ionic Liquid and Its Application in Catalyzing Knoevenagel Condensation CHEN Xuewei;LI Xuehui*;SONG Hongbing;LYangxiao;WANG Furong;HU Aixi* 2008, 29 (10):  957-959.  Abstract ( 2143 )   [Full Text(HTML)] () PDF (160KB) ( 1798 )   A novel basic ionic liquid paired by 1-butyl-3-methylimidazolium cation and imidazolide anion (［bmim］Im) was synthesized. The basicity of ［bmim］Im appro aches to that of ［bmim］OH and is much stronger than that of ［bmim］OAc. In aq ueous solution at room temperature, 2% of ［bmim］Im showed good catalytic prope rties for Knoevenagel condensation between aromatic aldehyde and active methyle ne compounds with 86%-95% yield and 100% selectivity for yli denemalononitriles.

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Effects of Lanthanum Substitution by Strontium and Calcium in La-Ni-Al Perovskite Oxides in Dry Reforming of Methane Alieh KHALESI;Hamid R. ARANDIYAN;Matin PARVARI* 2008, 29 (10):  960-968.  Abstract ( 2479 )   [Full Text(HTML)] () PDF (937KB) ( 896 )   Mixed perovskite oxides with CaxLa1-xNi0.3Al0.7O 3-d and SrxLa1-x-Ni0.3Al0.7O3-d (x=0, 0.2, 0.5, 0.8, and 1.0; d=0.5x) components have been pr epared by a sol-gel method. The effects of partial substitution of La by Ca and Sr on dry methane reforming were investigated at 500-800 °C and 101 kPa. Sr0.2La0.8Ni0.3Al0.7O2.9 showed a n excellent catalytic performance for methane dry reforming, with a H2/CO rati o of approximately 1 as depicted in the figure.

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Effect of Shaping Method of Iron-Based Catalyst on Its Performance for Slurry Fischer-Tropsch Synthesis HAO Qinglan;BAI Liang*;XIANG Hongwei;LI Yongwang 2008, 29 (10):  969-974.  Abstract ( 2414 )   [Full Text(HTML)] () PDF (480KB) ( 1161 )   This investigation focused on the effect of preparation methods for Fe-Cu-K-S iO2 catalyst on the FTS reaction performance. The microspheric catalyst exhibi ted excellent smooth surface, fine sphericity, and uniform particle size. Th e catalyst activity decreased with the increase of its average particle size. Th e separation between the wax product and the catalyst in-line was easy, and t he run stability was improved.

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A Novel Method for Preparation of Activated Alumina TAN Yanan;LI Feng;YI Xiaodong*;WANG Yuemin;FANG Weiping*;WAN Huilin 2008, 29 (10):  975-978.  Abstract ( 2435 )   [Full Text(HTML)] () PDF (311KB) ( 1439 )   A novel and simple method was developed to prepare amorphous alumina with suitab le acidity, specific surface area, and pore size distribution. First, AlCl3·6 H2O, citric acid, and starch were mixed and heated. After direct drying and c alcination, the amorphous alumina (A-Al2O3) was obtained. This novel prepar ation method was simple, and the Ni/A-Al2O3 catalyst showed high activity f or the hydrogenation and hydrocracking of ethylbenzene.

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The Reduction Process of a NiO/YSZ Anode for Intermediate Temperature Solid Oxide Fuel Cells LIU Bin;ZHANG Yun;TU Baofeng;LIU Lin;DONG Yonglai;CHENG Mojie* 2008, 29 (10):  979-986.  Abstract ( 2249 )   [Full Text(HTML)] () PDF (613KB) ( 1099 )   The reduction behavior of a sintered NiO/YSZ anode used for intermediate tempera ture solid oxide fuel cells was studied by H2 temperature-programmed reductio n, electrochemical impedance spectroscopy, and open circuit voltage. The reducti on of NiO/YSZ is affected by the sintering temperature, NiO content, and H2O p roduced during the initial reduction period.

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Preparation and Properties of Nanovoid SiO2-TiO2 Phase-Boundary Photocatalysts XU Zhanglian;WANG Sheng;WANG Tao;WANG Wei;CHEN Wenxing 2008, 29 (10):  987-991.  Abstract ( 2169 )   [Full Text(HTML)] () PDF (343KB) ( 1001 )   Novel phase-boundary photocatalysts were prepared by partial modification of th e surface of nanovoid SiO2-TiO2 nanoparticles with octadecyltriethoxysilan e (ODTS). Compared with TiO2 nanoparticles, the surface-alkylsilylated nanovoid SiO2-TiO2 nanoparticles showed excellent photostability and h igh photocatalytic activity for photodegradation of weak acid yellow G solution with mechanical stirring.

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Synthesis and Characterization of (+)-α-Phenylethanammonium Phosphotungstate and Its Catalytic Performance for Asymmetric Epoxidation WANG Lili;Wu Qihua;WANG Xiangyu* 2008, 29 (10):  992-996.  Abstract ( 2135 )   [Full Text(HTML)] () PDF (258KB) ( 1413 )   A new inorganic-organic hybrid polyoxotungstate with optical activity, (+)- α-phenylethanammonium phosphotungstate (C8H12-N)3PW12O4 0, was synthesized by a mild hydrothermal technique, and its structure was cha racterized by various methods. The catalyst showed good activity for the epoxidation of α-phenylethanammonium-cis-1-propenylphosphonate into α-phenylethanammonium-cis-1,2-epoxypropyl phosphotate.

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Screening of Lactonase-Producing Strains and Their Performance in Catalytic Resolution of Chiral Lactones ZHANG Xian;PAN Jiang;XU Jianhe* 2008, 29 (10):  997-1002.  Abstract ( 2321 )   [Full Text(HTML)] () PDF (321KB) ( 1270 )   By using immobilized cells of Fusarium proliferatum ECU2002, which was new ly isolated from soil samples, biocatalytic resolution of (±)-α-hydroxy-γ -butyrolactone was performed at a concentration of 1 mol/L and repeated for 10 cycles of reaction, retaining 92.8% of initial activity and affording the produc t with 92.8%-96.1% ee.

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Effect of ZrO2 Content of the ZrO2-Al2O3 Composite Support on Catalytic Properties of the Ni-Based Catalyst LI Ning* 2008, 29 (10):  1003-1008.  Abstract ( 2029 )   [Full Text(HTML)] () PDF (365KB) ( 823 )   The loading amount of ZrO2 in NiO/ZrO2-Al2O3 affected the reactivity an d stability of the catalyst. When the loading of ZrO2 was 0.60 g/g(Al2O3) , the dispersion of NiO reached the threshold value and the catalyst displayed a high catalytic activity and better stability.

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Selective Oxidation of Ethanol over Supported Gold Catalysts CHENG Yan;LI Gang*;MA Shuqi;WANG Xiangsheng;CHEN Yongying 2008, 29 (10):  1009-1014.  Abstract ( 2246 )   [Full Text(HTML)] () PDF (426KB) ( 1197 )   The gold catalysts supported on several oxides and H-ZSM-5 were used in the se lective oxidation of ethanol. Au/Al2O3 catalyst gave the highest selectivity for acetic ester. An appropriate quantity of basic additive in the reaction sys tem could evidently increase the ethanol conversion and the selectivity for acet ic ester. The ethanol conversion was 4.7% with 93.5% selectivity for acetic es ter under the optimal conditions.

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Catalytic Performance of H-MCM-22 and H-MCM-36 Zeolites for Alkylation of Benzene with Isopropanol ZHANG Zuowang;ZHANG Yu;WANG Zhenlü*;XING Haijun;JIA Mingjun;WU Tonghao;ZHANG Wenxiang* 2008, 29 (10):  1015-1020.  Abstract ( 2391 )   [Full Text(HTML)] () PDF (316KB) ( 964 )   H-MCM-22 and H-MCM-36, which were synthesized from the same precursor, are active catalysts for the alkylation of benzene with isopropanol. Compared with H-MCM-22, H-MCM-36 shows higher activity and selectivity for cumene, which is due to the fact that H-MCM-36 possesses more accessible Brnsted acid site s than H-MCM-22.

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Properties of β-Glucosidase Immobilized on Magnetic Nanoparticles of Aluminum Nitride PAN Lihua;LUO Jianping*;WANG Guijuan;XU Xueling;WAN Wen 2008, 29 (10):  1021-1026.  Abstract ( 2513 )   [Full Text(HTML)] () PDF (415KB) ( 976 )   The conditions for β-glucosidase immobilization on magnetic nanoparticles of aluminum nitride were optimized, and the properties of immobilized β-gl ucosidase including structure characterization and catalytic characteristics wer e investigated. The magnetic nanoparticle of aluminum nitride is a good support for the immobilization of β-glucosidase.

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Alcohol Oxidation on Pd Catalyst Supported on Tungsten Carbides/Carbon Nanotubes HU Xiduo;ZENG Zhifeng;HU Fengping;WANG Jingguo;SHEN Peikang* 2008, 29 (10):  1027-1031.  Abstract ( 2521 )   [Full Text(HTML)] () PDF (353KB) ( 998 )   Tungsten carbides on multiwalled carbon nanotubes (WC/MWCNT) were prepared by an intermittent microwave heating method and used as support to load Pd nanopartic les (Pd-WC/MWCNT) for alcohol oxidation. The catalyst activity was enhanced bec ause of the synergistic effect between Pd nanoparticles and the tungsten carbide s and the structure effect of the carbon nanotubes.

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Influence of the Reducing Atmosphere on the Structure and Activity of Mo-V-Te-Nb-O Catalysts for Propane Selective Oxidation DENG Zhonghua;WANG Hongxin;CHU Wenling*;YANG Weishen# 2008, 29 (10):  1032-1036.  Abstract ( 2152 )   [Full Text(HTML)] () PDF (419KB) ( 963 )   A Mo-V-Te-Nb-O catalyst with pure M1 phase was synthesized by a rotavap meth od under oxidative conditions. When some amount of NH4C1 was added to the synt hetic solution, M2 phase appeared, and the reactivity and mobility of lattice ox ygen were weakened in the order catalysts A>B>C～D, which was in good agreement with that of catalytic activity.

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Preparation and Performance of ITO/Fe3+-TiO2/ITO Solid-State Planar Photoelectrocatalytic Devices SHANG Jing*;XUE Lian;LI Jia;ZHAO Fengwei 2008, 29 (10):  1037-1042.  Abstract ( 2312 )   [Full Text(HTML)] () PDF (353KB) ( 952 )   For both ITO/TiO2/ITO and ITO/Fe3+-TiO2/ITO devices, the photocatalyt ic activity with bias (Xp1) was higher than that without bias (X p2). However, the enhancement of ITO/Fe3+-TiO2/ITO was less obvious than that of ITO/TiO2/ITO because of the confinement increment of exciton sep aration efficiency in the Fe3+-TiO2 film.

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Properties of CeO2-ZrO2 Solid Solution Supported on Si-Modified Alumina and Its Application in Pd Catalyst for Methane Combustion WANG Xiaohong;LU Guanzhong*;GUO Yun;QIAO Dongsheng;ZHANG Zhigang;GUO Yanglong;LI Chunzhong 2008, 29 (10):  1043-1050.  Abstract ( 2556 )   [Full Text(HTML)] () PDF (611KB) ( 927 )   CeO2-ZrO2 supported on Si-modified alumina was prepared by the reverse mic roemulsion method. The crystalline phase of Ce-Zr-O on Si-Al2O3 was the s ame as that of unsupported CeO2-ZrO2, and the thermal stability and oxygen storage/release capacity were improved. With the 0.2%Pd/10%Ce-Zr-O/Si-Al2O 3 catalyst, T90 for methane combustion was only 345 ℃, which was 17 5 ℃ lower than that of Pd supported on other supports.

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Efficient CO2 Capturer Derived from As-synthesized Mesoporous Silica Modified with Amines YUE Mingbo;ZHU Jianhua* 2008, 29 (10):  1051-1057.  Abstract ( 2154 )   [Full Text(HTML)] () PDF (450KB) ( 1676 )   How to incorporate a large amount of amine onto a porous host material and how to keep the guest well dispersed and distributed are crucial for the developmen t of solid amine adsorbents. The progresses on the design and preparation of sol id amine adsorbents are reviewed. Originating from the specific interaction of t he template with amine, the resulting composites possess a high capacity for CO 2 adsorption.

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Improvement of Coke Resistance Performance of Ni-Based Catalysts in Methane Reforming via Glow Discharge Plasma Treatment ZHANG Yueping;ZHU Xinli;PAN Yunxiang;LIU Changjun* 2008, 29 (10):  1058-1066.  Abstract ( 2223 )   [Full Text(HTML)] () PDF (729KB) ( 1007 )   The glow discharge plasma treatment of Ni catalysts followed by calcination ther mally leads to a significant improvement in the coke resistance. Such plasma-tr eated catalyst contains high concentration of close packed plane with improved N i dispersion and enhanced Ni-alumina interaction, which lead to high catalytic activity and excellent resistance to formation of filamentous carbon and encapsu lating carbon.