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Chinese Journal of Catalysis
2009, Vol. 30, No. 4
Online: 25 April 2009

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Chemoselective Oxidation of Sulfides with Ammonium Nitrate and Silica Sulfu-ric Acid Catalyzed by KBr Arash GHORBANI-CHOGHAMARANI, Mohammad Ali ZOLFIGOL, Toktam RASTEGAR 2009, 30 (4):  273-275.  Abstract ( 2357 )   [Full Text(HTML)] () PDF (93KB) ( 1352 )   A highly efficient chemoselective oxidation of sulfides to sulfoxides by ammonium nitrate, silica sulfuric acid, and a catalytic amount of KBr in the presence of wet SiO2.

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Fabrication of a Pt Nano-cluster/Photosensitive Polyimide Hybrid Membrane LONG Shuai;ZHANG Aiqing*;LIU Hanfan;LI Lin;DING Liqin 2009, 30 (4):  276-278.  Abstract ( 2323 )   [Full Text(HTML)] () PDF (324KB) ( 1101 )   A Pt nano-cluster/photosensitive polyimide hybrid membrane was prepared and applied to catalyze liquid phase hydrogenation of benzene. The highest selectivity for product cyclohexene is up to 72.4%. Pt nano-clusters were obtained by microwave irradiation with glycol solutions of H2PtCl6 as the platinum precursor. The average diameter of the platinum nano-particles was 3.7 nm by transmission electron microscopy.

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Acid Ionic Liquid Catalyzed Hydrolysis of Cellulose JIANG Feng;MA Ding*;BAO Xinhe 2009, 30 (4):  279-283.  Abstract ( 2457 )   [Full Text(HTML)] () PDF (338KB) ( 2290 )   The hydrolysis of cellulose in acid ionic liquids was investigated systematically. Ionic liquid 1-butyl-3-methylimidazolium chloride was used as the solvent of cellulose, and acid ionic liquid 1-butyl sulfonic acid-3-methylimidazolium chloride was used as the catalyst. It was proved that this novel hydrolysis process is totally feasible, and total reducing sugar yield is up to 95%.

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Preparation, Characterization, and Synthesis Mechanism of Nanostructured Vanadium Phosphorous Oxide Catalysts GAO Haohua;GAO Jinsen;*;LI Chunfu;LIU Xianming 2009, 30 (4):  284-290.  Abstract ( 2014 )   [Full Text(HTML)] () PDF (683KB) ( 918 )   The nanostructured vanadium phosphorous oxide precursor VOHPO4·0.5H2O has been directly synthesized by reduction of V2O5 using an improved organic solvent method. The VPO catalyst prepared from this novel process exhibited good activity and selectivity (68% selective and 81% conversion at 400 oC), and the specific surface area of catalyst BD-4-VPO reached 38.2 m2/g.

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Increasing Activity of Lipase from Bacillus subtilis by Directed Evolution ZHAO Bo;TAO Jin;MA Jisheng;LIAN Hong;WANG Yan;CHANG Lin;GAO Renjun*;CAO Shugui* 2009, 30 (4):  291-296.  Abstract ( 2433 )   [Full Text(HTML)] () PDF (524KB) ( 1444 )   Catalytic activity of a Bacillus subtilis lipase was enhanced by directed evolution. The distance between catalytic residue Ser77 and the substrate made an important contribution to the enzyme activity. The mutant lipase had lower energy, and its thermostability and pH stability were simultaneously increased.

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Influence of Solid Acid Catalysts on Steam Reforming of Dimethyl Ether for Hydrogen Production WANG Xiaolei;REN Kewei;PAN Xiangmin;LIN Rui;MA Jianxin;* 2009, 30 (4):  297-304.  Abstract ( 2768 )   [Full Text(HTML)] () PDF (556KB) ( 1122 )   The solid acid catalysts of HZSM-5 (n(SiO2)/ n(Al2O3) = 93.5) and g-Al2O3 were both effective on dimethyl ether (DME) hydrolysis. During a 30 h stability test, g-Al2O3 did not show obvious deactivation and remained about 60% DME conversion after 30 h. However, HZSM-5(93.5) began to be deactivated at 22 h and reached only about 9% DME conversion after 30 h reaction.

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Theoretical Study on the Acidity of Neighboring Acid Sites in ZSM-5 Zeolite and Its Effect on Ethylene Protonation WANG Shanpeng;WANG Yilei;CAO Liang;XING Shuangying;ZHOU Danhong* 2009, 30 (4):  305-311.  Abstract ( 2019 )   [Full Text(HTML)] () PDF (550KB) ( 1391 )   The acidity of the neighboring acid sites in HZSM-5 zeolite was theoretically studied. The stability and the acid strength of the acid site pair are in the order of Al6-Al6 > Al6-Al9. It is also found that the -Al-O-Si-O-Al- structure neighboring acid sites have strong effect on the adsorption and the protonation of ethylene and especially lead to very low stability of ethoxide product.

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Theoretical and Experimental Study on the Partial Hydrogenation of Benzene over Ru-Zn/ZrO2 Catalyst HE Huimin;YUAN Peiqing*;MA Yueming;CHENG Zhenmin;YUAN Weikang 2009, 30 (4):  312-318.  Abstract ( 2127 )   [Full Text(HTML)] () PDF (754KB) ( 1072 )   Partial hydrogenation of benzene over Ru-Zn/ZrO2 catalyst was investigated. Both the theoretical calculation and experimental study showed that the presence of Zn atoms on the catalyst surface is unfavorable to the chemisorption of cyclohexene, which is considered to be crucial to the improvement of cyclohexene yield. The optimal Zn content in the catalyst was also confirmed.

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Preparation and Mechanism Analysis of Molybdenum Carbide-Based Catalyst for Fuel Cell Cathode Reaction ZHANG Dongyun;WU Xi;MA Zifeng;*;Levi T. THAMPSON 2009, 30 (4):  319-322.  Abstract ( 2408 )   [Full Text(HTML)] () PDF (451KB) ( 1396 )   Mo2C/VC was used as the oxygen reduction electrocatalyst for proton exchange membrane fuel cells. The cyclic voltammetry results showed three reversible redox peaks at 0.34, 0.45, 0.55 V, respectively. Its electrocatalytic activity for oxygen reduction was attributed to the redox of surface passivated species (MoOxCy and MoOz) and the migration of oxygen in Mo2C crystal lattice.

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Preparation of Supported Cu-BiVO4 Photocatalyst and Its Application in Oxi-dative Removal of Toluene in Air SUO Jing;LIU Lifen*;YANG Fenglin 2009, 30 (4):  323-327.  Abstract ( 2440 )   [Full Text(HTML)] () PDF (539KB) ( 1570 )   A Cu-BiVO4 visible-light photocatalyst was prepared by impregna- tion of Cu(NO3)2 with hydrothermally prepared BiVO4. This composite after calcination and dispersion in a TEOS sol was immobilized onto stainless steel mesh. The removal rate of toluene is increased due to the hetero-junctions between CuO and BiVO4, and 5%Cu-BiVO4 has the highest activity.

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Density Functional Theory Study of H2O Adsorption and Decomposition YANG Yali;LU Chunhai;HUANG Juan;LI Yi;CHEN Wenkai;* 2009, 30 (4):  328-334.  Abstract ( 2371 )   [Full Text(HTML)] () PDF (692KB) ( 1290 )   Water adsorption on cubic ZrO2(110) surface was studied by the DFT method. The predicted adsorption energy is 150.5 kJ/mol for the stable model. To investigate the effect of surface hydroxyl groups on the catalytic properties of ZrO2, the density of states and charge population before and after water adsorption were also analyzed.

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Highly Photocatalytic Active and Easily Recycled Sulfur-Doped TiO2 Nanotubes WEI Fengyu*;SANG Lei 2009, 30 (4):  335-339.  Abstract ( 2701 )   [Full Text(HTML)] () PDF (747KB) ( 1253 )   Sulfur-doped TiO2 nanotubes (STNTs) were prepared by the two-step hydrothermal method. It has the single-crystalline anatase TiO2 with outer diameter of 10–20 nm and length of approximately 200 nm. The pseudo-first-order reaction rate constant k of STNTs is about 5 times higher under UV-light and 10 times higher under sunlight irradiation than those of undoped TiO2 nanotubes.

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Synthesis and Characterization of Magnesium-Substituted Aluminophosphate Molecular Sieves (MgAPO-11) and Their Kinetic Study of Catalytic Cracking of n-Hexane FENG Lili;;QI Xingyi;*;LI Zheng;ZHU Yuelin;LI Xingguo 2009, 30 (4):  340-346.  Abstract ( 2013 )   [Full Text(HTML)] () PDF (721KB) ( 1172 )   MgAPO-11 molecular sieves with various magnesium contents were synthesized by the static hydrothermal method using different molar fractions of MgO (x) in the reactive gel. The characterization results indicated that the isomorphous substitution of Mg(II) for Al(III) occurred. The reaction was first order in n-hexane. It was suggested that the monomolecular mechanism prevailed for this cracking reaction.

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Hydrothermal Fabrication and Catalytic Performance of Single-Crystalline La2-xSrxCuO4 (x = 0, 1) with Specific Morphologies for Methane Oxidation ZHANG Yue;ZHANG Lei;DENG Jiguang;WEI Li;DAI Hongxing*;HE Hong 2009, 30 (4):  347-354.  Abstract ( 2209 )   [Full Text(HTML)] () PDF (1069KB) ( 1239 )   Single-crystalline perovskite-like oxides La2-xSrxCuO4 with spindle-, rod-, and short chain-like morphologies can be fabricated hydrothermally with spindle-like CuO, plate-like La2O3, and nitrates as metal source. The LaSrCuO4 (Nitrate_LSCO) exhibited the highest catalytic activity, giving a CH4 consumption rate of up to 40.9 mmol/(g×h) at 675 oC.

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Kinetic Model Study on Enzymatic Hydrolysis of Cellulose Using Artificial Neural Networks ZHANG Yu;;XU Jingliang;YUAN Zhenhong;*;ZHUANG Xinshu;LVPengmei 2009, 30 (4):  355-358.  Abstract ( 2274 )   [Full Text(HTML)] () PDF (327KB) ( 887 )   Enzymatic hydrolysis of cellulose in a heterogeneous system is highly complex, rendering it difficult to build a theoretical model for confident prediction. Artificial neural network model is not conditioned by the need to assume a mechanistic dependency and can simulate and predict enzymatic hydrolysis of cellulose as a result of its advanced non-linear data analysis.

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Effects of Li Promoter on the Catalytic Performance of Fe-Li/AC for Ethylben-zene Dehydrogenation in the Presence of CO2 CHEN Shuwei;QIN Zhangfeng;SUN Ailing;WANG Jianguo;* 2009, 30 (4):  359-364.  Abstract ( 2158 )   [Full Text(HTML)] () PDF (427KB) ( 928 )   Dehydrogenation of ethylbenzene to styrene under CO2 was investigated over the activated carbon-supported iron catalyst with a Li promoter (Fe-Li/AC). The addition of Li greatly improves the catalytic activity of Fe/AC and the coupling effect of CO2 and suppresses the catalyst deactivation for EB dehydrogenation under CO2.

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Esterification of Acetic Acid with n-Butanol Catalyzed by Metallocenes XU Sheng;*;LI Hongbin;LIN Qiuning;ZENG Fanhua;SHEN Jie;YAN Xiuwei;MI Puke 2009, 30 (4):  365-369.  Abstract ( 2294 )   [Full Text(HTML)] () PDF (260KB) ( 1484 )   The application of Cp2Fe, Cp2TiCl2, Cp2ZrCl2, and [o-MeOC6H4C(Et)2Cp]2ZrCl2 in aliphatic acid esterification was studied. All the complexes are effective catalysts under homogeneous conditions. The silica-supported Cp2ZrCl2 catalyst exhibits high activity and leads to a green process for esterification without wastewater produced.

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Efficient Synthesis of (S)-1-(2-chlorophenyl)ethanol in the Submerged Culture of Alternaria alternata Isolate Esabi B. KURBANOGLU;*;Mesut TASKIN;Kani ZILBEYAZ;Ismet HASENEKOGLU 2009, 30 (4):  370-374.  Abstract ( 2074 )   [Full Text(HTML)] () PDF (144KB) ( 985 )   The asymmetric reduction of 2-chloroacetophenone to (S)-1-(2-chlorophenyl)ethanol in the batch culture of Alternaria alternata has been studied on a laboratory scale. The reaction has been carried out in a culture medium at a substrate concentration of 30 mmol/L and produced the desired product with complete conversion and an excellent enantiomeric excess of >99%. The yield of the process was calculated as 80%.