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Preferential oligomerization of isobutene in a mixture of isobutene and 1-butene over sodium-modified 12-tungstosilicic acid supported on silica

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Title: Preferential oligomerization of isobutene in a mixture of isobutene and 1-butene over sodium-modified 12-tungstosilicic acid supported on silica
Authors: Zhang, Jin Browse this author
Kanno, Mitsuru Browse this author
Zhang, Jiao Browse this author
Ohnishi, Ryuichiro Browse this author
Toriyabe, Kakeru Browse this author
Matsuhashi, Hiromi Browse this author
Kamiya, Yuichi Browse this author →KAKEN DB
Keywords: Supported heteropolyacid
Modification with alkali metal cations
Isobutene oligomerization
Surface acidity
Temperature-programmed desorption
Issue Date: 1-Jul-2010
Publisher: Elsevier B.V.
Journal Title: Journal of Molecular Catalysis A : Chemical
Volume: 326
Issue: 1-2
Start Page: 107
End Page: 112
Publisher DOI: 10.1016/j.molcata.2010.04.017
Abstract: Modification of 15 wt% H4SiW12O40/SiO2 with Na+ ions was investigated. Na-modified H4SiW12O40/SiO2 showed higher selectivity for isobutene oligomerization in the preferential oligomerization of isobutene in an equimolar mixture of isobutene and 1-butene than the unmodified one and the selectivity increased with an increase in the Na+ ion content. The highest selectivity (~97%) was achieved by using Na3HSiW12O40/SiO2. The activity decreased with an increase in the Na+ ion content. Unmodified H4SiW12O40/SiO2 had two kinds of acid sites with different acid strengths (medium and strong acid sites) on the outermost surface as revealed by temperature-programmed desorption of benzonitrile. However, the strong acid sites were eliminated by modification with alkaline metal cations: for example, Na3HSiW12O40/SiO2 had a negligible amount of strong acid sites. Thus, we concluded that the absence of strong acid sites on the outermost surface is the reason for the high selectivity. Li3HSiW12O40/SiO2 and K3HSiW12O40/SiO2 also exhibited high selectivity for isobutene oligomerization with activities comparable to that of Na3HSiW12O40/SiO2.
Type: article (author version)
URI: http://hdl.handle.net/2115/43649
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 神谷 裕一

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