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A study on the preparation of supported metal oxide catalysts using JRC-reference catalysts. I. Preparation of a molybdena–alumina catalyst. Part 2. Volume of an impregnation solution |
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| Authors: | Yasuaki Okamoto Yusaku Arima Michiyasu Hagio Kazuyuki Nakai Satoshi Umeno Yoshio Akai Kei Uchikawa Kazuhiro Inamura Takashi Ushikubo Naonobu Katada Sadao Hasegawa Hisao Yoshida Tsunehiro Tanaka Takaaki Isoda Isao Mochida Koichi Segawa Akio Nishijima Muneyoshi Yamada Hideyuki Matsumoto Miki Niwa Toshio Uchijima |
| Affiliation: | a Department of Materials Science, Shimane University Matsue 690 Japan b Catalysts and Chemicals Ind. Co., Ltd. Kitakyushu 808 Japan c Bel Japan, Inc., Ebie Osaka 553 Japan d Idemitsu Petrochemical Co., Ltd. Tokuyama 745 Japan e Idemitsu Kosan Co., Ltd. Sodegaura 299-02 Japan f Mitsubishi Chemicals Corp. Yokohama 227 Japan g Department of Materials Science, Tottori University Tottori 680 Japan h Department of Chemistry, Tokyo Gakugei University Koganei 184 Japan i Department of Molecular Engineering, Graduate School of Engineering, Kyoto University Kyoto 606-01 Japan j Institute of Advanced Material Study, Kyushu University Kasuga 816 Japan k Department of Chemistry, Sophia University Tokyo 102 Japan l National Institute of Materials and Chemical Research Tsukuba 305 Japan m Department of Applied Chemistry, Graduate School of Engineering, Tohoku University Sendai 980-77 Japan n Technology Marketing Department, Business Development Division, JGC Corp. Yokohama 232 Japan o Department of Materials Engineering, Tsukuba University Tsukuba 305 Japan |
| Abstract: | Ten types of 13 wt% MoO3/Al2O3 catalysts were prepared by a conventional impregnation or equilibrium adsorption method using a common extrudate support. These catalysts were subjected to a comprehensive characterization and catalytic reactions to find important preparation parameters in practical preparations. It was demonstrated in the present group study that the formation of crystalline MoO3 was strongly correlated with the Mo segregation on the outer surface of the extrudate. When the amount of the impregnation solution was large (ca. 10 cm3 g-Al2O3−1), a considerably homogeneous distribution and high dispersion of Mo oxide species were attained irrespective of the other preparation parameters. It is suggested that when a pore volume impregnation or incipient wetness technique is employed, drying processes strongly affect the dispersion and distribution of Mo oxide species. Drying at a reduced pressure is suggested to result in a segregation of Mo oxides on the outer surface of the extrudate, and accordingly a formation of crystalline MoO3. |
| Keywords: | MoO3/Al2O3 Preparation Dispersion of Mo Distribution of Mo HDS Hydrogenation |
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