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Chinese Journal of Catalysis
2008, Vol. 29, No. 12
Online: 25 December 2008

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Phosphorus Ligand Modified Rh/SiO2 Catalyst for Hydroformylation of Methyl-3-pentenoate LI Xianming;DING Yunjie;*;JIAO Guiping;LI Jingwei;YAN Li;ZHU Hejun 2008, 29 (12):  1193-1195.  Abstract ( 2197 )   [Full Text(HTML)] () PDF (162KB) ( 857 )   A phosphorus ligand-modified Rh/SiO2 catalyst (L-Rh/SiO2) has been develop ed for hydroformylation of internal olefins to linear aldehydes. This catalyst h as high activity and regioselectivity and can be separated easily by filtratio n after reaction in an autoclave. Moreover, the electronic and steric effects of phosphorus ligands on the catalytic performance of the L-Rh/SiO2 catalyst ha ve been investigated.

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n-Hexane Isomerization by Pt/WO3-ZrO2 Using Hydrothermally Synthesized Hydrous Zirconia as Support SONG Yueqin;KANG Chenglin;FENG Yanlong;LIU Feng;ZHOU Xiaolong*;DONG Renyao;XU Longya 2008, 29 (12):  1196-1198.  Abstract ( 3619 )   [Full Text(HTML)] () PDF (263KB) ( 1147 )   A Pt/WO3-ZrO2 catalyst was prepared by impregnating hydrous zirconia synthe sized by the hydrothermal method. The effect of hydrothermal conditions of Z r(OH) 4 on the isomerization behavior of the catalyst was investigated. The present ca talyst showed interesting isomerization behavior. The catalyst prepared using cr ystalline zirconia as the support possessed a higher isomerization activity than that prepared using amorphous zirconium hydroxide as the support.

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Vapor Phase Synthesis of 3-Methylindole over a Ag/SiO2 Catalyst ZHENG Jiacong;LIU Jing;TAN Wei;SHI Lei*;SUN Qi 2008, 29 (12):  1199-1201.  Abstract ( 2272 )   [Full Text(HTML)] () PDF (183KB) ( 764 )   Ag/SiO2 was used as an efficient catalyst for the vapor phase synthesis of 3- methylindole from aniline and 1,2-propanediol under atmospheric pressure. When Ag/SiO2 was calcined at 500 ℃ for 4 h and the molar ratio of H2O to H2 wa s 0.750 in the reaction, the yield of 3-methylindole was up to 35%. The Ag/SiO 2 catalyst with silver crystallites was active for the synthesis of 3-methyli dole.

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Immobilization of 12-Tungstophosphoric Acid on AlSBA-15 and Its Catalytic Activity for Acetylation Immobilization of -S. REVATHI;M. Esther Leena PREETHI;D. MANIKANDAN;D. DIVAKAR;A. Valentine RUPA; 2008, 29 (12):  1202-1210.  Abstract ( 1890 )   [Full Text(HTML)] () PDF (868KB) ( 854 )   12-Tungstophosphoric acid with Keggin structure was introduced onto the Al-inc or porated mesoporous molecular sieves (AlSBA-15) by the incipient wetness method. The materials were characterized by XRD, nitrogen adsorption, HRTEM, and UV-Vis diff use reflectance to confirm the existence of Keggin and mesopore structure. HRTEM images showed the good dispersity of the species into the mesopore region.

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Au-CuO/TiO2 Catalyst for the Removal of H2 from CO2-Rich Gases FANG Deren*;REN Wanzhong;XU Xiufeng;LIAO Weiping;L Hongying;AN Lidun 2008, 29 (12):  1211-1214.  Abstract ( 2274 )   [Full Text(HTML)] () PDF (249KB) ( 961 )   Au-CuO/TiO2 and Au/TiO2 catalysts were prepared by the deposition-precipi tation method. The influence of preparation conditions such as deposition temper ature, deposition pH, calcination temperature, and Cu/Au molar ratio on the cata lytic performance was evaluated. Au-CuO/TiO2 has higher catalytic activity a nd stability than Au/TiO2 in the removal of H2 from CO2-rich gases. The influence of treatment order of reduction and H2S poisoning on the catalytic a ctivity was also studied. The Au-CuO/TiO2 catalyst is more sensitive to t he treatment than the Au/TiO2 catalyst, which shows that an Au-Cu alloy m ay be formed in the Au-CuO/ TiO2 catalyst after reduction.

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Catalytic Performance of Mesoporous Ce1-xZrxO2-Supported CuO-Based Catalyst for CO Selective Oxidation under H2-Rich Conditions TENG Meiling;LUO Laitao* 2008, 29 (12):  1215-1220.  Abstract ( 1906 )   [Full Text(HTML)] () PDF (509KB) ( 1008 )   Mesoporous Ce1-xZrxO2 (x=0.2, 0.35, 0.5) samples were syn thesized using polyol as the template, and CuO/Ce1-xZrxO2 catalyst samples were prepared by impregnation. The highest surface area of t he support and higher CO conversion and selec tivity of the Cu-based catalyst for CO selective oxidation under the H2-ric h conditions were obtained when x=0.5 owing to that the CuO/Ce0.5Zr 0.5O2 sample had the strongest interaction between the active component an d the support, the highest dispersion, and the most CO adsorption amount.

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Methane Combustion over Pd/Al2O3 Catalyst: Effects of Chlorine Ions and Water on Catalytic Activity GAO Diannan;WANG Sheng;ZHANG Chunxi;YUAN Zhongshan;WANG Shudong* 2008, 29 (12):  1221-1225.  Abstract ( 2606 )   [Full Text(HTML)] () PDF (349KB) ( 1136 )   This work investigated the effects of chlorine ions and water on the performance of the Pd/Al2O3 catalyst for the catalytic combustion of methane. Residual chlo rine ions inhibit the catalyst activity by blocking chemisorption sites. The act ivity also decreases with the addition of water vapor to the feed stream owing t o the formation of inactive Pd(OH)2.

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Density Functional Theory Study of Dimethyl Ether Adsorption on Pt(100) Surface LIU Hui;YIN Geping*;LI Yanwei;CHEN Gang;LU Leilei;WANG Zhenbo 2008, 29 (12):  1226-1230.  Abstract ( 2167 )   [Full Text(HTML)] () PDF (305KB) ( 1049 )   The optimized structure of CH3OCH3 adsorbed on the clean Pt(100) surface was ach ieved by means of DFT and periodic modeling structure. The relationship between the initial adsorption site and the steady adsorbed structure was thus clarified . Moreover, the most favorable adsorption site was obtained and the C- H bond seems to be activated much easier especially at that site.

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Microcalorimetric and FT-IR Studies of CO Adsorption on Supported Iridium Catalysts WANG Xingtang;LI Lin;HUANG Yanqiang;WANG Xiaodong*;ZHANG Tao* 2008, 29 (12):  1231-1236.  Abstract ( 2402 )   [Full Text(HTML)] () PDF (411KB) ( 985 )   For Ir/Al2O3, a pair of bands assigned to gem-dicarbonyl species adsorbed o n Irδ+ were overlapped with a carbonyl band due to linear species on Ir 0. The adsorption heat could be the average heat produced by the formation of both gem-dicarbonyl and linear species. For Ir/SiO2, several bands ranged in 2100-2000 cm-1 were identified and attributed to the linearly bonded CO to larger and smaller Ir0 clusters.

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HY Zeolite Modified by Liquid Silane Deposition and Its Catalytic Activity in Selective tert-Butylation of Naphthalene WANG Yingli;XU Lei;YU Zhengxi;ZHANG Xinzhi;LIU Zhongmin* 2008, 29 (12):  1237-1241.  Abstract ( 2112 )   [Full Text(HTML)] () PDF (286KB) ( 933 )   HY zeolite was modified by chemical liquid deposition with i-C4H9Si (OC2H5)3 and a hydrothermal treatment. Due to the modification of microp ore structure and the narrowing of pore opening in the modified samples, t he differenc e in adsorption rate between various adsorbants with different kinetic diam e ters was more pronounced. The suppression was stronger on larger molecules.

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Effects of Ammonium Hexafluorosilicate Modification on Acidity of HMCM-22 and Catalytic Performance of CuO-ZnO-Al2O3/HMCM-22 for Dimethyl Ether Synthesis MAO Dongsen*;XIA Jianchao;CHEN Qingling;LU Guanzhong 2008, 29 (12):  1242-1246.  Abstract ( 2280 )   [Full Text(HTML)] () PDF (360KB) ( 919 )   HMCM-22 zeolite was modified with ammonium hexafluorosilicate at different t emperatures and used as an acidic component of the CuO-ZnO-Al2O3/HMCM-22 bifunctional catalyst for the direct synthesis of dimethyl ether (DME) from syng as. The modification at 45 ℃ (Cat F2) significantly enha nced DME selectivity. However, both CO conversion and DME selectivity were decre ased remarkably when the zeolite was treated at higher temperature (85 ℃, Cat F 3).

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Synthesis and Characterization of ZSM-5/Silicalite-1 Core-Shell Zeolite with a Fluoride-Containing Hydrothermal System TONG Weiyi;KONG Dejin;*;LIU Zhicheng;GUO Yanglong*;FANG Dingye 2008, 29 (12):  1247-1252.  Abstract ( 2674 )   [Full Text(HTML)] () PDF (400KB) ( 963 )   By using ZSM-5 as the core material, which was pretreated with 25% citric acid and then calcined, ZSM-5/Silicalite-1 micro-composites with core-shell struc ture was hydrothermally synthesized in a fluoride-containing system. The compac t silicalite-1 shell reaches 97% coverage on the surface of the core ZSM-5 aft er the secondary intergrown. The product has a decreased surface acidity and a p reservation of the original inside channel acidity.

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Ti/IrO2-Coated Electrode with Iridium-Titanium Oxide Interlayer by TiN Nano-particle Oxidation HU Jiezhen;XU Haibo*;LU Yonghong;HUANGFU Shujun;WANG Jia;DAI Lin 2008, 29 (12):  1253-1258.  Abstract ( 2285 )   [Full Text(HTML)] () PDF (611KB) ( 1106 )   The Ti/IrOx-TiO2/IrO2 electrode with iridium-titanium oxide interl ayer (n(Ir)/n(Ti)=49 (2), 9 (3), 4 (4), 1.5 (5)) was prepared by the i mpregation-thermal decomposition method. Compared with the conventional Ti/IrO 2 electrode (1), it not only increased its electrocatalytic activity for oxyge n evolution but also greatly improved its service life.

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Epoxidation of Olefins Catalyzed by Fluoride-Pillared Layered Double Hydroxide YE Dazhou;ZHUO Guanglan* 2008, 29 (12):  1259-1265.  Abstract ( 2258 )   [Full Text(HTML)] () PDF (432KB) ( 1133 )   A series of fluoride-pillared layered double hydroxide (LDH-F) samples with different Mg/Al ratios were prepared and characterized by X-ray diffracti on, fourier transform infrared spectroscopy, scanning electron microscopy, and B ET surface area measurements. The epoxidation of various olefins was carried out using LDH-F of Mg/Al =5 as the catalyst and 30%H2O2 and benzonitrile as th e oxidants. This catalytic system has excellent catalytic activity. The conversi on and selectivity are both above 95% in the epoxidation of styrene, indene, allyl alcohol, and allyl chloride.

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Effect of Residual Sodium on the Catalytic Activity and Stability of Cu-Based Methanol Synthesis Catalyst ZUO Yizan;AN Xin;HAN Minghan*;WANG Jinfu;WANG Dezheng;JIN Yong 2008, 29 (12):  1266-1270.  Abstract ( 2249 )   [Full Text(HTML)] () PDF (512KB) ( 1229 )   A series of Cu/ZnO/Al2O3/ZrO2 catalysts with different amounts of residual sodiu m were prepared by washing with different amounts of deionized water. The activi ty and stability of the catalyst increased markedly with decreasing sodium conte nt. The presence of residual sodium accelerated the catalyst sintering, which in creased the crystallite size and decreased the specific surface area of t he cataly st. A highly active and stable methanol synthesis catalyst should have a residua l sodium content below 0.5 mg/g.

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Study on Fixed-Bed Process of Epoxidation of Allyl Chloride Catalyzed by Ti-MWW YAO Mingkai;YANG Junxia;ZHAO Song;LIU Yueming*;WU Haihong;WU Peng 2008, 29 (12):  1271-1276.  Abstract ( 1888 )   [Full Text(HTML)] () PDF (448KB) ( 755 )   The epoxidation of allyl chloride with hydrogen peroxide was conducted over Ti-MWW in a fixed-bed reactor. The studies of reaction conditions in the fixe d-bed reactor system showed that the operation parameters had obvious influence s on the epoxidation of allyl chloride (ALC), especially on the WHSV of H2O2 . Low WHSV of H 2O2 promoted the decomposition of H2O2 and decreased the ALC conversion an d the utilization efficiency of H2O2.

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Characterization of Nanosized SrTiO3 Catalyst for Oxidative Coupling of Methane by in Situ ESR and TPSR MIAO Jianwen;*;SONG Guohua;FAN Yining;ZHOU Jing 2008, 29 (12):  1277-1282.  Abstract ( 2128 )   [Full Text(HTML)] () PDF (435KB) ( 900 )   The catalytic performance of nanosized SrTiO3 (n(Sr)/n(Ti)=1.2) a nd conventional SrTiO3 (n(Sr)/n(Ti)=1.2) for OCM reaction was mea sured. The nanosized SrTiO3 catalyst exhibited better catalytic activity at l ow temperature (～650 ℃) than the conventional SrTiO3 catalyst with the sam e composition. The catalytic performance of the nanosized SrTiO3 catalyst was correlated to the higher concentration of F centers owing to low coordination nu mbers on the nanosized oxide particles.

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Contents of Volumn 29 (Chinese) 2008, 29 (12):  1283-1288.  Abstract ( 1544 )   [Full Text(HTML)] () PDF (188KB) ( 953 )

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Contents of Volumn 29 (English) 2008, 29 (12):  1289-1297.  Abstract ( 1422 )   [Full Text(HTML)] () PDF (468KB) ( 851 )