Hydrothermal Synthesis of Mo-Based Oxide Catalysts and Selective Oxidation of Alkanes |
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| Authors: | Wataru Ueda Kenzo Oshihara Damien Vitry Tokio Hisano Youhei Kayashima |
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| Affiliation: | (1) Catalysis Research Center, Hokkaido University, Kita-ku, Kita 11, Nishi 10, Sapporo, 060-0811, Japan;(2) Department of Materials Science and Engineering, Science University of Tokyo in Yamaguchi, 1-1-1 Daigaku-dori, Onoda, Yamaguchi, 765-0884, Japan;(3) Research Laboratories of Resource Utilization, Tokyo Institute of Technology, Nagatsuta 4259, Midori-ku, Yokohama, 226-0045, Japan |
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| Abstract: | Mo-V-M(=Al, Ga, Bi, Sb and Te)–O mixed oxide catalysts were synthesized hydrothermally for the first time, characterized structurally, and tested for ethane and propane oxidation after activation by various ways. These catalysts were black solids of rod-shaped (fiber like) crystals, which had a layer structure in the direction of fiber axis and a high dimensional arrangement of metal octahedra in the cross-section plane. These fresh crystalline materials became active for catalytic oxidation of alkanes after heat-treatment at 600 °C and subsequent grinding in order to increase exposed plane of the cross-section. The resulting catalysts were very active for an oxidative dehydrogenation of ethane with 80% of the ethylene selectivity in the reaction temperature range of 300 to 400 °C and also showed about 50% selectivity to acrylic acid in the propane oxidation. Multi-functional character which derived from the high dimensional structure of the catalysts and mechanism of the selective alkane oxidation were discussed. |
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| Keywords: | hydrothermal synthesis Mo-V oxide catalyst catalyst structure alkane selective oxidation ethane propane isobutane ethene acrylic acid |
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