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Chinese Journal of Catalysis
2008, Vol. 29, No. 11
Online: 25 November 2008

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Highly Efficient VOx/SBA-16 Mesoporous Catalyst for Hydroxylation of Benzene ZHU Yujun;DONG Yongli;ZHAO Lina;YUAN Fulong*;FU Honggang 2008, 29 (11):  1067-1069.  Abstract ( 1927 )   [Full Text(HTML)] () PDF (350KB) ( 956 )   Highly dispersed vanadium oxide supported on mesoporous SBA-16 (VOx/SBA-16) with a cubic (Im3m) pore structure prepared by impregnation method shows excellent catalytic activity for hydroxylation of benzene. Nanostructured VO4 species and crystallites of V2O5 play a key role in the catalytic reaction.

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Facile Synthesis of CeO2 Nanospheres TA Na;ZHANG Milin;LI Juan;LI Huaju;LI Yong;SHEN Wenjie* 2008, 29 (11):  1070-1072.  Abstract ( 2305 )   [Full Text(HTML)] () PDF (401KB) ( 1561 )   Uniform ceria nanospheres with an average size of about 320 nm were prepared by a urea-hydrothermal route. The ceria nanospheres present a core-shell configur ation constructed by nanoparticles and nanosheets and predominantly expose the (111) planes. The ammonia bubble produced by urea hydrolysis plays a cruc ial role in determining the spherical structure. The redox properties and catalytic performance of CeO2 nanospheres rely on the unique stru cture closely.

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Nanocatalysts by Quantum Electrodynamics Induced Electromagnetic Radiation Thomas V. PREVENSLIK 2008, 29 (11):  1073-1078.  Abstract ( 2071 )   [Full Text(HTML)] () PDF (406KB) ( 701 )   Nanoparticle (NP) catalysts weaken chemical bonds upon adsorption of A and B rea ctants, but unsupported or supported NPs still require electromagnetic (EM) ener gy to complete the reaction. Quantum electrodynamics (QED) provides this EM ener gy by inducing the absorbed thermal kT energy of A and B molecules accumulat ed i n collisions with the NPs to be emitted as vacuum ultraviolet (VUV) radiation, t he product AB forming by QED induced VUV photolysis.

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Synthesis of Nanosized ZnO/MgO Solid and Its Catalytic Activity for CO Oxidation Olga Z. DIDENKO;Gulnara R. KOSMAMBETOVA;Peter E. STRIZHAK* 2008, 29 (11):  1079-1083.  Abstract ( 2140 )   [Full Text(HTML)] () PDF (473KB) ( 1394 )   The effect of ZnO nanoparticle size on their catalytic activity in CO ox idation was studied. Nonmonotonic correlation between the CO oxidation rate and t he size of nanoparticles in a very narrow range of 2.0-2.3 n m was revealed.

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Chabazite-Clay Composite for Bitumen Upgrading BIAN Junjie*;Steven M. KUZNICKI;William C. McCAFFREY;Andree KOENIG;Christopher C. H. LIN 2008, 29 (11):  1084-1088.  Abstract ( 2093 )   [Full Text(HTML)] () PDF (509KB) ( 806 )   We synthesized the novel chabazite-clay composite for better oilsands bitumen u pgrading via assembling chabazite on the kaolin surface under alkaline condition s. The chabazite-kaolin composite has such a unique exterior surface, accessibl e to large hydrocarbon molecules, that it could moderate oilsands derived bitume n upgrading reaction with high performance of contaminant (sulfur, nitrogen, ni ckel, and vanadium) removal.

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Effect of the Morphology of the Ceria Support on the Activity of Au/CeO2 Catalysts for CO Oxidation JIA Kunming;ZHANG Huili;LI Wencui* 2008, 29 (11):  1089-1092.  Abstract ( 2368 )   [Full Text(HTML)] () PDF (507KB) ( 1114 )   Ceria with different morphology was prepared by a hydrothermal method. The coll oidal deposition method selected to prepare the catalysts allowed the isolation of the support effect on the catalytic activity and excluded the influence of go ld particle formation by their deposition on the support. The activity of the Au /CeO2 catalysts for CO oxidation was investigated.

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Effects of RuO2 Content in Pt/RuO2/CNTs Nanocatalyst on the Electrocatalytic Oxidation Performance of Methanol ZHOU Chunmei;WANG Hongjuan;LIANG Jiahua;PENG Feng*;YU Hao;YANG Jian 2008, 29 (11):  1093-1098.  Abstract ( 2125 )   [Full Text(HTML)] () PDF (736KB) ( 934 )   The methanol electrocatalytic oxidation performance of Pt/RuO2/CNTs nanocata lyst is strongly dependent on the RuO2 content. The specific capacitance change of R uO2/CNTs is the main reason for the change of methanol electrocatalytic activi ty . The Pt/RuO2/CNTs catalyst with 15%Pt and 9.5%RuO2 has the best methanol e lectrocatalytic oxidation activity.

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Adsorption Mechanism and Dynamic Behavior of Water and Ethanol Molecules Inside Au Nanotubes WANG Yao-Chun;CHEN Chuan;JU Shin-Pon* 2008, 29 (11):  1099-1106.  Abstract ( 2130 )   [Full Text(HTML)] () PDF (631KB) ( 736 )   Molecular dynamics simulation was used to investigate the behavior of water a nd ethanol molecules at various weight fractions inside the Au nanotube. The rad ius density distribution and the probability of the number of hydrogen bonds pe r water and ethanol molecule were used to investigate the nano-confined effect.

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Palladium Catalysts Supported on Fishbone Carbon Nanofibers from Different Carbon Sources ZHOU Jinghong;SUI Zhijun;ZHOU Xinggui*;YUAN Weikang 2008, 29 (11):  1107-1112.  Abstract ( 2255 )   [Full Text(HTML)] () PDF (796KB) ( 970 )   Fishbone carbon nanofibers (FCNFs) from different carbon sources (CO, CH4, and C2H4) possess similar fishbone structure but quite different physicochemical properties. The supported Pd catalysts (0.5%) present various activity for tere phthalic acid (TA) hydro-purification. It is believed that rather than the grap hene arrangement，the synergic support effect dictates the Pd dispersion on FCNF and the consequent catalytic activity.

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Mechanical Behavior of Single-Walled Carbon Nanotubes in Water under Tensile Loadings: A Molecular Dynamics Study JU Shin-Pon;WENG Meng-Hsiung;LIN Jenn-Sen*;LU Jian-Ming;CHANG Jee-Gong;WU Wen-Hsien 2008, 29 (11):  1113-1116.  Abstract ( 2016 )   [Full Text(HTML)] () PDF (374KB) ( 710 )   Molecular dynamics simulation was carried out to investigate the behavior of (5,5) and (10,10) armchair carbon nanotubes in water under tensile loading. The Young’s modulus of nanotubes in water remains the same as that in vacuum. However, the tensile stress of nanotubes in water is less than that in vacuum.

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Structural Properties of (CeO2)n(n=1-5) Nanoparticle: Molecular Mechanics and First Principle Studies CHEN Chuan;CHEN Hui-Lung;WENG Meng-Hsiung;JU Shin-Pon*;CHANG Jee-Gong;CHANG Ching-Sheng 2008, 29 (11):  1117-1121.  Abstract ( 2064 )   [Full Text(HTML)] () PDF (303KB) ( 723 )   The FIRE algorithm combined with the simulated annealing method w as firstly employed to find the structures of (CeO2)n (n=1-5) with g lobal minimum potential energy. These structures were further refined by the density functional theory simulation in order to deeply understand their structu ral properties.

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Molecular Dynamics Simulation on the Nanoindentation Behavior of a Copper Bilayered Thin Film LIAO Ming-Liang;WENG Meng-Hsiung;JU Shin-Pon*;CHIANG Hsing-Jung 2008, 29 (11):  1122-1126.  Abstract ( 1911 )   [Full Text(HTML)] () PDF (565KB) ( 705 )   Nanoindentation is one of widely used tools for examining mechanical propert ies of metal thin films. In this study, molecular dynamics simulation was e mployed to investigate the nanoindentation behavior of a Cu(100)/Cu(110) bilayer ed thin film. The detailed deformation structure of the bilayered thin film was observed to be similar to that of its ingredients and correlated very well with the load-displacement response.

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Synthesis and Characterization of Manganese Oxide Octahedral Molecular Sieve and Its Catalytic Performance for DME Combustion YU Lin*;SUN Ming;YU Jian;YU Qian;HAO Zhifeng;LI Chaosheng 2008, 29 (11):  1127-1132.  Abstract ( 2016 )   [Full Text(HTML)] () PDF (692KB) ( 883 )   Nano-rod shaped OMS-2 was synthesized by the sol-gel method with a nonionic s urf actant MPEG as the structure-directing agent. The OMS-2 showed excellent catal yt ic performance for DME combustion and could convert it to CO2 and H2O at a l ow temperature. The lattice oxygen played a key role in DME combustion.

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Experimental Apparatus for Characterizing the Internal Diffusivity of Microporous Powders SONG Zhejian;WANG Dezheng* 2008, 29 (11):  1133-1137.  Abstract ( 1736 )   [Full Text(HTML)] () PDF (310KB) ( 779 )   A BET adsorption apparatus with a high precision differential pressure sensor, which small laboratories can afford, for the use of measurement of internal diffusivity and micropore size distribution (mPSD) of microp orous powders is described. The apparatus is based on gas uptake rate measurem ents and adsorption manometry for measuring internal diffusivity and mPSD.

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Selective Synthesis of Single/Double/Multi-walled Carbon Nanotubes on MgO-Supported Fe Catalyst ZHANG Qiang;ZHAO Mengqiang;HUANG Jiaqi;QIAN Weizhong;WEI Fei* 2008, 29 (11):  1138-1144.  Abstract ( 2300 )   [Full Text(HTML)] () PDF (1088KB) ( 1130 )   Single/double/multi-walled carbon nanotubes (S/D/MWCNTs) were selectively syn the sized on a MgO-supported iron catalyst by chemical vapor deposition from methan e . The selectivities for SWCNTs and DWCNTs on 0.5%Fe/MgO and 3.0%Fe/MgO were over 90 % and 75%, respectively. This provides a controlled way to selectively synthesiz e CNTs on a large scale in a fluidized bed.

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Carbon Nanofiber-Supported Pd Catalysts for Heck Reaction: Effects of Support Interaction ZHU Jun;ZHAO Tiejun;Ingvar KVANDE;CHEN De*;ZHOU Xinggui#;YUAN Weikang 2008, 29 (11):  1145-1151.  Abstract ( 2719 )   [Full Text(HTML)] () PDF (998KB) ( 807 )   In order to prepare stable and reusable heterogeneous catalysts, palladium nanop articles were supported on platlet carbon nanofiber (pCNF), fishbone carbon nano fibers (fCNF) and tubular carbon nanofibers (tCNF). It was found that the Pd loa ding and particle size as well as the amount of Pd leaching during the Heck reaction were strongly related to the potential difference between the CNF surf aces and the palladium colloids. Pd leaching in the Heck reaction can be signifi cantly suppressed by increasing potential difference between the CNF surfaces an d the palladium colloids during catalyst preparation. The Pd activity decreased exponentially with the Pd size.

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Catalytic Menbranes and Catalytic Membrane Reactors: An Integrated Approach to Catalytic Process with a High Efficiency and a Low Environmental Impact Enrico DRIOLI;Enrica FONTANANOVA;Marcella BONCHIO;Mauro CARRARO;Martino GARDAN;Gianfranco SCORRANO 2008, 29 (11):  1152-1158.  Abstract ( 2365 )   [Full Text(HTML)] () PDF (727KB) ( 1248 )   New catalytic membranes have been realized by the heterogenization of the photoc atalyst decatungstate (W10) in membranes made of the partially fluorinated polyv inylidenefluoride (PVDF) and the perfluorinated polymer Hyflon. The photocatalyt ic composite membranes are characterized by different and tuneable properties de pending on the nature of the polymeric micro-environment, in which the catalyst is confined.

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Epoxidation of Styrene with Hydrogen Peroxide over Mn-Ti-Al-MCM-41 Molecular Sieve under Microwave Irradiation WANG Guangjian;*;LIU Zhengwang;LIU Yiwu;LIU Guangqing;XU Mingxia;WANG Lei 2008, 29 (11):  1159-1164.  Abstract ( 2074 )   [Full Text(HTML)] () PDF (669KB) ( 807 )   A novel bimetal mesoporous molecular sieve Mn-Ti-MCM-41has been studied for the epoxidation of styrene with H2O2 under microwave irradiation. The result s of HRTEM, SEM-mapping of Mn and Ti, and 29Si MAS NMR revealed t hat the materials exhibited a typical hexagonal arrangement of mesoporous struct ure and uniform dispersion of Mn and Ti in MCM-41 framework.

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Platinum Nanoparticles Stabilized by Polyvinylpyrrolidone for Hydrogenation Nelly ZAKARINA;Essen BEKTUROV 2008, 29 (11):  1165-1168.  Abstract ( 2198 )   [Full Text(HTML)] () PDF (487KB) ( 1309 )   Nanosized colloidal platinum was prepared by reduction of H2PtCl6 in the pre sence of polyvinylpyrrolidone (PVP) in a methanol-water mixture by refluxing. T he sample showed high catalytic activity for acetylene hydrogenation. The PVP mo lecular mass, their concentration, and reduction time have effects on Pt particle size and catalytic activity.

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Catalysis in Micro-structured Membrane Reactors with Nano-designed Membranes Juergen CARO 2008, 29 (11):  1169-1177.  Abstract ( 2163 )   [Full Text(HTML)] () PDF (914KB) ( 1125 )

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Promotional Effects of Au in Pd-Au Catalysts for Vinyl Acetate Synthesis CHEN Mingshu;D. W. GOODMAN* 2008, 29 (11):  1178-1186.  Abstract ( 1918 )   [Full Text(HTML)] () PDF (997KB) ( 794 )   The main role of Au in Pd-Au bimetallic catalysts for vinyl acetate(VA) synthes is is to break contiguous Pd atom ensembles at the surface into isolated Pd mono mers. The absence of contiguous Pd sites thus significantly reduces the formati on of combustion by-products and suppresses the poison effects of CO, thus enha ncing the VA formation selectivity and activity.

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Synthesis Strategies to Design Structures for Catalytic Applications Harold H. KUNG*;Mayfair C. KUNG 2008, 29 (11):  1187-1192.  Abstract ( 2117 )   [Full Text(HTML)] () PDF (585KB) ( 751 )   Approaches to synthesize silicon-based catalytic structures that aim at capturi n g the properties and functionalities of natural enzymes include unit-by-unit s yn thesis of macromolecular units with atomic control and templating/imprinting syn thesis of nanocages which sacrifices atomic control for convenience. A combinati on of these approaches may lead to the desired structures ultimately.