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Phase-boundary catalysts for acid-catalyzed reactions : the role of bimodal amphiphilic structure and location of active sites

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Title: Phase-boundary catalysts for acid-catalyzed reactions : the role of bimodal amphiphilic structure and location of active sites
Authors: Nur, Hadi Browse this author
Ikeda, Shigeru Browse this author →KAKEN DB
Ohtani, Bunsho Browse this author →KAKEN DB
Keywords: phase-boundary catalysis
acid-catalyzed reactions
Issue Date: Sep-2004
Publisher: Brazilian Chemical Society
Journal Title: Journal of the Brazilian Chemical Society
Volume: 15
Issue: 5
Start Page: 719
End Page: 724
Publisher DOI: 10.1590/S0103-50532004000500018
Abstract: The catalytic potential of phase-boundary catalyst for acid-catalyzed reactions has been demonstrated by NaY zeolite loaded with alkylsilane-covered niobic acid in the liquid phase hydration of 1,2-epoxyoctane with water. The catalyst was prepared by impregnation of niobic acid on the external surface of NaY and followed by a partial modification of the external surface of NaY with alkylsilyl groups. When the particles were added to a mixture of water and 1,2-epoxyoctane, they were feasibly located just at the liquid-liquid phase boundary and efficiently catalyzed hydration of the epoxide even without stirring. In order to investigate the effect of the location of the active sites, alkylsilylated HZSM-5 and sulfonic acid functionalized NaY in which the active sites are located dominantly on the internal surface of zeolites were prepared. In that case, mechanical stirring was needed to increase the reaction rate. It was suggested that alkylsilylation on the external surface of zeolite, when the active site is mainly inside the pore, could not change the mode of the catalytic action; it is still necessary to stir the reaction mixture to drive the mass transfer of substrates and reagents.
Type: article
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: 大谷 文章

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