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Multiphase reaction media including dense phase carbon dioxide and/or water: A case study for hydrogenation of phenol with a Pd/Al2O3 catalyst

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タイトル: Multiphase reaction media including dense phase carbon dioxide and/or water: A case study for hydrogenation of phenol with a Pd/Al2O3 catalyst
著者: Yoshida, Hiroshi 著作を一覧する
Narisawa, Satomi 著作を一覧する
Fujita, Shin-ichiro 著作を一覧する
Arai, Masahiko 著作を一覧する
キーワード: Carbon dioxide
Water
Hydrogenation
Catalyst deactivation
CO formation
発行日: 2013年11月15日
出版者: Elsevier science bv
誌名: Journal of molecular catalysis a-chemical
巻: 379
開始ページ: 80
終了ページ: 85
出版社 DOI: 10.1016/j.molcata.2013.07.019
抄録: Multiphase reaction media including dense phase CO2 and/or water were applied for a test reaction of hydrogenation of phenol with a Pd/Al2O3 catalyst. The features of these reaction media were clarified and the actions of dense phase CO2 and water were discussed. Different characterization methods (XPS, in situ high pressure FUR, ICP) were used to study (i) the surface of supported Pd particles that varied during the reaction, (ii) the competitive adsorption of phenol, water, and CO that was formed from H-2 and CO2 under pressurized conditions, and (iii) the leaching of active Pd species. Dense phase CO2 caused the deactivation of catalyst and it occurred more rapidly in the presence of both dense phase CO2 and water. In the system including water alone, the catalyst deactivation also happened but gradually. At the latter stage of reaction in this system, phenol was not consumed but cyclohexanone did transform to cyclohexanol. Those results may be explained by the leaching of Pd species and a structural change of supported Pd particles, resulting in a change in their adsorption behavior. The Pd leaching is more significant in acidic aqueous phase dissolving CO2 at high pressure. (C) 2013 Elsevier B.V. All rights reserved.
資料タイプ: article (author version)
URI: http://hdl.handle.net/2115/54742
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 荒井 正彦

 

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