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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
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)
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Submitter: 神谷 裕一
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