Chinese Journal of Catalysis

Chinese Journal of Catalysis ›› 2009, Vol. 30 ›› Issue (10): 976-980.

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Effect of Pore Structure of SiO2 on Catalytic Performance of Pd-SiW12/SiO2 for Direct Oxidation of Ethylene to Acetic Acid

XU Shuliang1, 2, WANG Lixia1, 2, CHU Wenling1,*, YANG Weishen1,*   

  1. 1State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China 2Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2009-10-25 Online:2009-10-25 Published:2013-06-06

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Abstract: The Pd-SiW12/SiO2 catalysts with different pore structure of SiO2 were prepared for direct oxidation of ethylene to acetic acid. The catalysts were characterized by X-ray diffraction, N2 physical adsorption, infrared spectroscopy of adsorbed pyridine, and H2-pulse chemical adsorption. The results showed that the pore structure of SiO2 had an important influence on the catalytic performance of the catalysts. The Pd-SiW12/SiO2 catalyst prepared by the SiO2 support with larger pore size and pore distribution exhibited the highest catalytic activity, on which 145.2 g/(L·h) of acetic acid yield was obtained. Pd dispersion was responsible for the catalytic activity of the Pd-SiW12/SiO2 catalyst.

Key words: palladium, silicotungstic acid, silica, ethylene, oxidation, acetic acid