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Chinese Journal of Catalysis
2009, Vol. 30, No. 3
Online: 25 March 2009

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Synthesis and Characterization of Ruthenium-Titanium Composite Oxide and a Platinum Catalyst Supported on It WANG Aiping;XU Haibo;*;LU Yonghong;HU Jiezhen;KONG Xiangfeng; 2009, 30 (3):  179-181.  Abstract ( 2177 )   [Full Text(HTML)] () PDF (2061KB) ( 1427 )   Ru0.1Ti0.9O2 nanopowder was synthesized from TiN nanoparticle and RuCl3 precursors by the impregnation-thermal decomposition method. The supported Pt/Ru0.1Ti0.9O2 electrocatalyst was then prepared by solid phase synthesis. Pt/Ru0.1Ti0.9O2 showed much better stability than Pt/C in an anti-polarization experiment. Pt/Ru0.1Ti0.9O2 also showed much better electrocatalytic properties as a PEMFC cathodic catalyst by modifying a membrane electrode.

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Hydrogenation of o-Chloronitrobenzene by Platinum Nanoparticles on Activated Carbon MAO Jianzhong;YAN Xinhuan*;GU Huizi;JIANG Lingchao 2009, 30 (3):  182-184.  Abstract ( 2187 )   [Full Text(HTML)] () PDF (5212KB) ( 1091 )   Pt nanoparticles were prepared by decomposing Pt2(dba)3 at H2 pressure of 0.5–2.0 MPa. The size of the Pt nanoparticles decreased from 11.5 to 2.8 nm with increasing decomposition pressure from 0.5 to 2.0 MPa. The catalyst decomposed at higher pressure exhibited higher activity and lower selectivity.

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Ruthenium Ammonium Chloride as a Precursor for the Preparation of High Activity Catalysts for Ammonia Synthesis NI Jun;WANG Rong;LIN Jianxin;WEI Kemei* 2009, 30 (3):  185-190.  Abstract ( 2137 )   [Full Text(HTML)] () PDF (2706KB) ( 1097 )   The new precursor, Ru(NH3)5Cl3, gives a more than 10% increase in the activity of the RuN/AC catalyst for ammonia synthesis over the conventional catalyst Ru/AC prepared from the RuCl3•nH2O precursor on activated carbon (AC) under the reaction conditions of 10 MPa and 10 000 h–1.

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Synthesis of Zeolite Beta by the Vapour-Phase Transport Method Using Tetraethylammonium Bromide as the Organic Template NIU Tianying;LI Yingxia*;LI Jianwei;CHEN Biaohua 2009, 30 (3):  191-195.  Abstract ( 2156 )   [Full Text(HTML)] () PDF (2622KB) ( 1219 )   The synthesis of zeolite beta by the vapour-phase transport method using tetraethylammonium bromide (TEABr) as a cheap organic template was studied. With TEABr being solid state at room temperature, the materials were mixed directly, and the preparing xerogel was not necessary. This method is promising and economical, which simplifies the synthetic process and reduces the cost.

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Preparation and Catalytic Performance of Sulfonated Carbon-Based Solid Acid ZHOU Lina;LIU Ke;HUA Weiming;YUE Yinghong*;GAO Zi 2009, 30 (3):  196-200.  Abstract ( 2522 )   [Full Text(HTML)] () PDF (624KB) ( 1403 )   Sulfonated carbon-based solid acids exhibited high activity for the alkylation of hydroquinone and the hydrolysis of ethyl acetate. However, the stability of the solid acids was poor, especially in the alkylation of hydroquinone, because of the leaching of sulfonic groups from the surface of the catalyst.

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Preparation of VO3-, MoO42- and WO42-Catalysts Supported on Hydrotalcite- Like CuMgAl under Microwave and Their Catalytic Behavior for Phenol Hydroxylation SHI Fengwei;GU Hongjuan;LI Yafeng;WANG Daowu;ZHANG Long* 2009, 30 (3):  201-206.  Abstract ( 2152 )   [Full Text(HTML)] () PDF (4960KB) ( 1210 )   VO3-, MoO42-, and WO42--supported CuMgAl catalysts were prepared using the impregnation method under microwave irradiation and were used to catalyze phenol hydroxylation. Compared with the CuMgAl precursors, MoO42?-supported CuMgAl gives a high selectivity for hydroquinone without significant changes in the phenol conversion.

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Selective Oxidation of Aromatic Alcohols over Amorphous Mn-Ce-O Catalyst TANG Qinghu;*;WU Chengming;HUANG Xiaona;YANG Yanhui 2009, 30 (3):  207-212.  Abstract ( 3184 )   [Full Text(HTML)] () PDF (508KB) ( 1483 )   Amorphous Mn-Ce-O synthesized by a redox- precipitation method was used as a highly efficient and recyclable catalyst for the selective oxidation of aromatic alcohols in the presence of molecular oxygen. The catalytic activity of Mn-Ce-O with n(Mn)/n(Ce) = 10/1 was the highest. The benzyl alcohol conversion reached 96.6%, and the mass specific activity was 19.3 mmol/(g•h).

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Preparation and Catalytic Activity of Egg-Shelled Catalyst Pd/a-Al2O3 LIU Xiufang;JI Yang;LI Wei;XIAO Wende* 2009, 30 (3):  213-217.  Abstract ( 2022 )   [Full Text(HTML)] () PDF (1954KB) ( 1503 )   Egg-shelled Pd/α-Al2O3 catalysts with different active layers were prepared by impregnation. The catalytic activity for the synthesis of dimethyl oxalate from CO and methyl nitrite was investigated. The catalyst pellets were characterized by polarized optical microscopy. For obtaining high methyl nitrite conversion and dimethyl oxalate yield, the active component of palladium should be placed in a thin layer at the external surface of the pellet.

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Effects of Rare Earth Doping on the Performance of Nano-Ba-Magnesia Supports and Ru-Based Catalysts for Ammonia Synthesis HUO Chao*;XIA Qinghua;YANG Xiazhen;LUO Yan;LIU Huazhang 2009, 30 (3):  218-222.  Abstract ( 2200 )   [Full Text(HTML)] () PDF (5521KB) ( 1289 )   The Ru catalysts were prepared by the impregnation method using rare earth (La, Sm, and Ce) and barium-doped nano- magnesia (RE-Ba-MgO) as the supports. The Ru/La-Ba-MgO catalyst showed the highest catalytic activity for the ammonia synthesis with a reaction rate of 65.49 mmol/(g•h) at 10 MPa, 400 oC, and 10 000 h?1, upgrading 66.3% compared with Ru/Ba-MgO. It would be valuable for the development of effective and applicable catalysts for the ammonia synthesis industry.

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Steam Reforming of Dimethyl Ether over Coupled ZSM-5 and Cu-Zn-Based Catalysts FENG Dongmei;ZUO Yizan;WANG Dezheng;WANG Jinfu* 2009, 30 (3):  223-229.  Abstract ( 2376 )   [Full Text(HTML)] () PDF (6104KB) ( 2681 )   Cu-Zn-based catalysts were prepared by a novel co- precipitation procedure. Physical mixtures containing a Cu-Zn-based catalyst and ZSM-5 catalyst to couple DME hydrolysis and methanol steam reforming were used to examine the synergistic effects on DME steam reforming. The activity and selectivity were influenced by the catalyst composition and copper content, and also the content of Al and Zr.

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Preparation of Highly Dispersed MnxOy/SBA-15 and Its Catalytic Properties CHEN Yong;LI Yongsheng;*;LI Liang;GU Jinlou;ZHAO Wenru;LI Lei;SHI Jianlin;* 2009, 30 (3):  230-234.  Abstract ( 2108 )   [Full Text(HTML)] () PDF (4417KB) ( 1395 )   A simple method was developed to prepare highly dispersed MnxOy/SBA-15 composites by incipient wetness co- impregnation of carbon and Mn precursors into the pore structure of SBA-15. The catalysts showed high activity and selectivity for the oxidation of ethylbenzene using tert-butyl hydroperoxide as the oxidant in a liquid phase.

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Catalytic Decomposition of Low-Level Ozone by Au/AC Prepared by a Sol Immobilization Method ZHANG Bo;ZHANG Pengyi;*;SHI Rui;WANG Huajun 2009, 30 (3):  235-241.  Abstract ( 2343 )   [Full Text(HTML)] () PDF (6861KB) ( 1135 )   Two kinds of Au/AC catalysts were prepared from the same precursor and reduced by microwave and conduction methods, respectively. The Au particles prepared by the microwave method was much smaller and more uniform than that by the conduction method. As a result, the former catalyst showed higher activity for ozone decomposition.

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Hydrogenation of Quinoline Catalyzed by Ruthenium Phosphine Complex in Ionic Liquids LI Qiang;ZHANG Ruimin;ZHOU Limei;FU Haiyan;CHEN Hua;*;LI Xianjun 2009, 30 (3):  242-246.  Abstract ( 2396 )   [Full Text(HTML)] () PDF (487KB) ( 1086 )   The catalyst [RuCl2(TPPTS)2]2 was used in the regioselective hydrogenation of quinoline in [Rmim][p-CH3C6H4SO3] with high conversion and selectivity. The products can be easily separated from the catalyst immobilized in ionic liquids by simple extraction with cycohexane. The conversion reached 86.0% when the catalyst was reused 6 times.

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Preparation of La0.75Sr0.25Mn1-xNixO3+δ Materials and Their Catalytic Performance for Methane Partial Oxidation WANG Lei;ZENG Shaohua;ZHANG Lijuan;CHEN Yaoqiang;GONG Maochu* 2009, 30 (3):  247-253.  Abstract ( 2246 )   [Full Text(HTML)] () PDF (1610KB) ( 1177 )   Perovskite materials La0.75Sr0.25Mn1-xNixO3+δ (x = 0, 0.4, 0.5, and 0.6, and the corresponding samples are denoted LSM, LSMN4, LSMN5, and LSMN6) were prepared by a citric chelating method. Among these samples, LSMN5 is prone to catalyze methane partial oxidation at relatively low temperature and has best catalytic performance at high temperature. This may be interpreted by the large amounts of reducible species and oxygen species on the surface and in the bulk.

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Catalytic Oxidation of Cyclohexanol on the Ti/Ni/NiO Electrode LIANG Zhenhai*;SUN Hongyan;CUI Yuqing 2009, 30 (3):  254-258.  Abstract ( 2122 )   [Full Text(HTML)] () PDF (2096KB) ( 1315 )   The electrocatalytic oxidation of cyclohexanol on the Ti/Ni/NiO electrode in the alkaline solution was investigated by cyclic voltammetry. The oxidation of cyclohexanol follows the electrocatalytic mechanism. The Ti/Ni/NiO electrode can be used as an effective catalyst for the oxidation of cyclohexanol to adipic acid in basic media.

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Synthesis of Carbon Nanotubes-Supported Pd/SnO2 for the Hydrogenation of ortho-Chloronitrobenzene WANG Chuang;QIU Jieshan*;LIANG Changhai 2009, 30 (3):  259-264.  Abstract ( 2591 )   [Full Text(HTML)] () PDF (13616KB) ( 1030 )   A new method was developed for the synthesis of Pd/SnO2/CNTs nano-catalysts, in which three steps are involved: the adsorption of Sn2+ on the surface of CNTs, the addition and reduction of Pd2+ by Sn2+, and the formation of SnO2 due to the hydrolyzation of Sn4+. The as-obtained Pd/SnO2/CNTs catalysts show high ortho-chloroaniline selectivity in the hydrogenation of chloronitrobenzene.

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Preparation of Novel Mesoporous SO42-/TiO2 Solid Acid Catalyst and Its Catalytic Activity for Esterification YU Hui;ZHU Yinhua;LIU Chang;YANG Zhuhong;LU Xiaohua*;FENG Xin 2009, 30 (3):  265-271.  Abstract ( 2501 )   [Full Text(HTML)] () PDF (2269KB) ( 1380 )   A novel mesoporous SO42-/TiO2 solid acid catalyst with whisker morphology and high surface area was prepared by incipient impregnation. The catalyst can be separated from the reaction system by gravity sedimentation. The prepared catalyst showed remarkable acid catalytic activity for the esterification of butanol with acetic acid.