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Mechanistic study of the selective hydrogenation of carboxylic acid derivatives over supported rhenium catalysts

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Title: Mechanistic study of the selective hydrogenation of carboxylic acid derivatives over supported rhenium catalysts
Authors: Takashi, Toyao Browse this author →KAKEN DB
Kah Wei, Ting Browse this author
S. M. A. Hakim, Siddiki Browse this author →KAKEN DB
Touchy, Abeda S. Browse this author
Onodera, Wataru Browse this author
Maeno, Zen Browse this author →KAKEN DB
Ariga-Miwa, Hiroko Browse this author →KAKEN DB
Kanda, Yasuharu Browse this author
Asakura, Kiyotaka Browse this author →KAKEN DB
Shimizu, Ken-ichi Browse this author →KAKEN DB
Issue Date: 7-Oct-2019
Publisher: Royal Society of Chemistry
Journal Title: Catalysis Science & Technology
Volume: 9
Issue: 19
Start Page: 5413
End Page: 5424
Publisher DOI: 10.1039/c9cy01404g
Abstract: The structure and performance of TiO2-supported Re (Re/TiO2) catalysts for selective hydrogenation of carboxylic acid derivatives have been investigated. Re/TiO2 promotes selective hydrogenation reactions of carboxylic acids and esters that form the corresponding alcohols, and of amides that generate the corresponding amines. These processes are not accompanied by reduction of aromatic moieties. A Re loading amount of 5 wt% and a catalyst pretreatment with H-2 at 500 degrees C were identified as being optimal to obtain the highest catalytic activity for the hydrogenation processes. The results of studies using various characterization methods, including X-ray diffraction (XRD), X-ray absorption fine structure (XAFS), X-ray photoelectron spectroscopy (XPS), and scanning transmission electron microscopy (STEM), indicate that the Re species responsible for the catalytic hydrogenation processes have sub-nanometer to a few nanometer sizes and average oxidation states higher than 0 and below +4. The presence of either a carboxylic acid and/or its corresponding alcohol is critical for preventing the Re/TiO2 catalyst from promoting production of dearomatized byproducts. Although Re/TiO2 is intrinsically capable of hydrogenating aromatic rings, carboxylic acids, alcohols, amides, and amines strongly adsorb on the Re species, which leads to suppression of this process. Moreover, the developed catalytic system was applied to selective hydrogenation of triglycerides that form the corresponding alcohols.
Type: article (author version)
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 鳥屋尾 隆

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