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Chinese Journal of Catalysis
2009, Vol. 30, No. 6
Online: 25 June 2009

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A High Electrochemical Performance Proton Conductor Electrolyte with CO2 Tolerance GUO Youmin;LIN Ye;SHI Huangang;RAN Ran;SHAO Zongping* 2009, 30 (6):  479-481.  Abstract ( 2084 )   [Full Text(HTML)] () PDF (2769KB) ( 1115 )   XRD patterns of BaZr0.1Ce0.7Y0.2O3 (BZCY1) and BaZr0.4Ce0.4Y0.2O3 (BZCY4) oxides before and after treatment under various CO2-containing atmospheres indicated that BZCY4 is a promising high CO2-tolerent proton conductor material. The study of fuel cell performance showed that BZCY4 has the potential for direct operating reformed gas.

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Acidity Characterization and Acid Catalysis Performance of Titanium Silicalite (TS-1) LIU Wenhuan;GUO Peng;SU Ji;HU Jia;WANG Yanmei;LIU Na;GUO Hongchen;* 2009, 30 (6):  482-484.  Abstract ( 2520 )   [Full Text(HTML)] () PDF (415KB) ( 1164 )   Hammett indicator titration was used for the characterization of TS-1 acidity. The acid strength of the TS-1 studied was H0 = +3.3 – +4.8. In the epoxidation of propylene, only the stronger acid sites can trigger the side-reaction of propylene oxide with methanol. The weaker acid sites, although very weak, are active and selective to convert ethyldiamine to piperazine and 1,4-diazabicyclo- [2.2.2]octane.

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Promotion of Platinum Electrocatalyst by Hydrous Ruthenium Oxide for Methanol Oxidation MA Junhong;YU Jie;ZHAO Dan;WANG Anjie;XU Boqing;* 2009, 30 (6):  485-489.  Abstract ( 2415 )   [Full Text(HTML)] () PDF (554KB) ( 1147 )   A series of Pt-(RuOxHy)m/MWCNTs electrocatalysts (m denotes atomic Ru/Pt ratio) with hydrous ruthenium oxide (RuOxHy) as an exclusive species of the ruthenium component were prepared by sequential loading RuOxHy and Pt on the multi-walled carbon nanotube support. The effects of composition and pretreatment potential on the electrocatalytic activity of Pt were investigated. The results clearly showed that RuOxHy is a very effective promoter of Pt electrocatalyst for methanol electro- oxidation.

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Two-Step Calcined MoVTeNbO Catalysts for the Oxidation of Propane to Acrylic Acid WANG Hongxin;DENG Zhonghua;CHU Wenling;*;YANG Weishen;# 2009, 30 (6):  490-496.  Abstract ( 2188 )   [Full Text(HTML)] () PDF (645KB) ( 899 )   The two-step calcination method of MoVTeNbO catalysts used in the selective oxidation of propane to acrylic acid was investigated. The results indicated that the two-step calcination method was propitious to obtain highly effective catalysts. The calcination temperatures of every stage affect the phase structure and the catalytic performance of catalysts.

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Effects of Olivines from Different Quarries on the Steam Reforming of Benzene YANG Xiaoqin;XU Shaoping*;HU Guan;LIU Changhou 2009, 30 (6):  497-502.  Abstract ( 2220 )   [Full Text(HTML)] () PDF (5811KB) ( 1164 )   Four iron-bearing olivines (Mg,Fe)2SiO4 from different quarries of China have been evaluated for catalytic steam reforming of benzene. Several characterization techniques such as N2 adsorption, X-ray diffraction, temperature-programmed reduction, and scanning electron microscopy were used to explore the relationship between the catalytic behavior and the nature of the olivine. The most active olivine was the one with the largest surface area and the most reducible iron content.

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Preparation of Amphiphilic HZSM-5 Zeolite by Chemical Vapor Deposition of Trimethylchlorosilane JIANG Ping;MA Li;PAN Jian;CHUN Yuan*;XU Qinhua;DONG Jialu 2009, 30 (6):  503-508.  Abstract ( 2130 )   [Full Text(HTML)] () PDF (443KB) ( 982 )   Amphiphilic HZSM-5 zeolite particles were prepared by the chemical vapor deposition of (CH3)3SiCl on the external surface of HZSM-5 zeolite followed by post-evacuation at 423–523 K to remove excessive hydrophobic CH3 groups. With a similar internal surface property and pore size to the parent zeolite, they exhibited obviously superior catalytic performance in the hydrolysis of isoamyl acetate.

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Alkaline Earth Metals-Modified SAPO-34 for Methanol Conversion to Light Olefins LI Hongbin;LÜJinzhao;WANG Yijing;WANG Xinping* 2009, 30 (6):  509-513.  Abstract ( 2353 )   [Full Text(HTML)] () PDF (393KB) ( 1229 )   The investigation focused on modifying SAPO-34 zeolite with alkaline earth metals to increase the anti-coking ability of the catalyst in methanol conversion to light olefins (MTO). 1%Ba/SAPO-34 gave a prolonged lifetime by 27% compared with SAPO-34 under the reaction conditions of WHSV = 2 h?1, 450 oC, and atmospheric pressure.

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Synthesis, Characterization, and Catalytic Performance of Nest-Like Magnesia Spheres ZHANG Shigang;;;XU Lei;;LIU Hongchao;;MENG Shuanghe;;YANG Yue;;CHEN Jiping;LIU Zhongmin;;* 2009, 30 (6):  514-518.  Abstract ( 2853 )   [Full Text(HTML)] () PDF (5665KB) ( 1263 )   Nest-like alkaline magnesium carbonate spheres were successfully prepared from self- assembled thin nanoplates, which can convert to nest-like magnesium oxide (MgO) without changes of morphology by calcination. The obtained nest-like MgO spheres show a high specific surface area and large pore volume. A high selectivity (92.36%) for acetol can be achieved in the conversion of 1,2-propylene glycol over the MgO with nest-like structure.

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Hydrogen Production by Partial Oxidation and Reforming of Dimethyl Ether: Investigation of Partial Oxidation Catalysts ZHANG Qijian;*;DU Feng;HE Xinxin;ZHOU Yingchun;LIU Zhongwen 2009, 30 (6):  519-524.  Abstract ( 2184 )   [Full Text(HTML)] () PDF (404KB) ( 1006 )   Combined with the reforming catalyst Ni/Al2O3, Pt/Al2O3 was found to be a suitable partial oxidation catalyst. Al2O3 as support gave better performance than MgO or ZrO2. The optimized Pt loading on Al2O3 was 0.5%, and the optimized reduction temperature and reaction temperature were both 700 oC. H2 yield of 80% was obtained and DME conversion was kept at 100%.

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Synthesis of ZSM-23 Zeolite Using Isopropylamine as Template LIU Ye;WANG Zhendong;LING Yun;LI Xianbo;LIU Yueming*;WU Peng 2009, 30 (6):  525-530.  Abstract ( 2313 )   [Full Text(HTML)] () PDF (10508KB) ( 1522 )   The formation of different zeolite crystal phases was found in the hydrothermal system of isopropylamine-silica sol-NaAlO2-H2O. ZSM-23 zeolite with controllable morphology can be synthesized in this system by changing synthesis conditions, especially the SiO2/Al2O3 molar ratio and template concentration. Needle-shaped ZSM-23 with length of 150–200 nm was obtained steadily under the appropriate conditions.

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Preparation, Characterization, and Catalytic Performance of Mesoporous ZSM-12 Zeolite WU Wei;*;LI Lingfei;WU Guang;WANG Xin;WU Weiguo;KIKHTYANIN O;TOKTALEV A;ECHEVSKII G 2009, 30 (6):  531-536.  Abstract ( 2223 )   [Full Text(HTML)] () PDF (498KB) ( 1236 )   ZSM-12 zeolite was modified by 0.2, 0.4, and 0.8 mol/L NaOH solution under appropriate conditions. The degree of desilication and mesopore distribution can be controlled by changing the concentration of NaOH solution.

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Reduction Performance and Mechanism of Ba-Doped Nano-magnesia-Sup-ported Ru Catalysts for Ammonia Synthesis HUO Chao*;XIA Qinghua;LUO Yan;YANG Xiazhen;LIU Huazhang 2009, 30 (6):  537-542.  Abstract ( 2128 )   [Full Text(HTML)] () PDF (3662KB) ( 1149 )   The Ru/Ba-MgO and Ru/La-Ba-MgO catalysts were reduced due to the BaO acting as the most activate form. The effect of reduction conditions on the catalytic performance of the ruthenium catalysts was studied by a heating-holding-heating reduction program, and the reduction mechanism of ruthenium catalysts under hydrogen atmosphere was discussed.

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Au Catalysts Supported on Titania with Different Crystal Phases for Selective Hydrogenation of Crotonaldehyde XIE Guanqun;LIU Xijing;TAO Liping;LU Jiqing;LUO Mengfei;*;LI Xiaonian;* 2009, 30 (6):  543-548.  Abstract ( 2423 )   [Full Text(HTML)] () PDF (2033KB) ( 1267 )   The phase composition of TiO2 has an important influence on Au/TiO2 catalysts in the selective hydrogenation of crotonaldehyde. The mixed phase of rutile and anatase can improve both the activity and the selectivity for crotyl alcohol. Furthermore, higher reduction temperature favors the selectivity for crotyl alcohol, which is 2.7 times that of butanal at the reduction temperature of 500 oC.

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Effect of Calcination Temperature of Support on the Performance of o-Mo/MgO-Al2O3 Water-Gas Shift Catalyst LIAN Yixin;WANG Huifang;FANG Weiping;YANG Yiquan* 2009, 30 (6):  549-554.  Abstract ( 2077 )   [Full Text(HTML)] () Co-Mo-based catalysts with MgO-Al2O3 mixed oxide supports calcined at 600–800 oC exhibit high activity for water-gas shift reaction. The catalytic activity was closely related to the specific surface area, acid-base properties, and Mo species on the support surface.

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Influences of Different Active Carbons on the Catalytic Performance of Ni/C Catalysts for Vapor-Phase Carbonylation of Ethanol ZHANG Qing;WANG Huifang;SUN Guosong;HUANG Kelin;FANG Weiping;儀;YANG Yiquan;儀 2009, 30 (6):  555-559.  Abstract ( 2360 )   [Full Text(HTML)] () PDF (505KB) ( 944 )   Different active carbons, i.e. bamboo charcoal (BC), cylindrical coal (CYC), fruit carbon (FC), wood charcoal (WC), and coconut charcoal (CC), were used to prepare Ni/C catalysts for vapor-phase carbonylation of ethanol. The catalytic performance of the catalysts was related to the nature of active carbons and the Ni/CC catalyst showed the maximal activity.

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Theoretical Study on the Adsorption of Ethylene on FeO(100) Surface WANG Lingling;CHEN Wenkai;*;LU Chunhai;LI Yi 2009, 30 (6):  560-564.  Abstract ( 2132 )   [Full Text(HTML)] () PDF (21163KB) ( 604 )   Four different sites on FeO(100) surface were chosen to study the adsorption of ethylene. It was found that ethylene forming double σ bonds with two iron atoms was the most favorable structure with the adsorption energy of 86.8 kJ/mol. Calculated results showed that the adsorbed C2H4 rehybridized from sp2 to sp3 partly.

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Synthesis and Characterization of Visible-Light-Responding Bi0.5La0.5VO4 Solid Solution for Photocatalytic Water Splitting WANG Qizhao;LIU Hui;YUAN Jian;SHANGGUAN Wenfeng;* 2009, 30 (6):  565-569.  Abstract ( 2621 )   [Full Text(HTML)] () PDF (2354KB) ( 2030 )   Visible-light-driven Bi0.5La0.5VO4 solid solution was synthesized by a solid state reaction at high temperature and used to split water to stoichiometric H2 and O2 under visible light (λ > 400 nm) irradiation with cocatalysts.

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Effect of Surface Carboxyl Groups of Carbon Nanotubes on the Dispersion of RuO2 Nanoparticles PENG Dingfen;YU Hao;PENG Feng;WANG Hongjuan;YANG Jian 2009, 30 (6):  570-576.  Abstract ( 2609 )   [Full Text(HTML)] () PDF (2204KB) ( 1863 )   The dispersion and catalytic activity of nano-RuO2 catalyst depend on the carboxyl groups from carbon nanotube surfaces or polydentrate ligands but had no correlation with the hydroxyl and carbonyl groups on carbon nanotube.

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Progress of Rhodium/Diphosphine-Catalyzed Homogeneous Hydroformylation of Internal Olefins LIU Wenjing;YUAN Maolin;FU Haiyan;LI Ruixiang;CHEN Hua* 2009, 30 (6):  577-586.  Abstract ( 2316 )   [Full Text(HTML)] () PDF (428KB) ( 1155 )   Internal olefins are cheaper and more readily available feedstock than terminal olefins. The development of highly selective and active hydroformylation catalysts for internal olefins to produce linear aldehydes is of great importance from economic and energy points of view. This review systematically summarized the progress in this area using a variety of diphosphine ligands.