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Sulfated silica-titania aerogel as a bifunctional oxidative and acidic catalyst in the synthesis of diols

Hamdan, Halimaton and Ling, Lee Siew (2008) Sulfated silica-titania aerogel as a bifunctional oxidative and acidic catalyst in the synthesis of diols. Journal of Non-Crystalline Solids, 354 (33). pp. 3939-3943. ISSN 0022-3093

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Official URL: http://dx.doi.org/10.1016/j.jnoncrysol.2008.05.034

Abstract

Sulfated silica-titania aerogel (SO4/ST) catalyst was prepared by direct synthesis and modified with H2SO4 by wet impregnation method. Brønsted acid sites were generated after sulfation of the silica-titania aerogel with a pKa of -14.52. Consecutive transformation of 1-octene, catalyzed by sulfated silica-titania aerogel using aqueous hydrogen peroxide as oxidant shows high activity towards 1,2-octanediol through the formation of 1,2-epoxyoctane. The formation of 1,2-octanediol is enabled by the co-existence of sulfated Ti species with Brønsted acid sites in the SO4/ST system. Sulfated silica-titania aerogel catalyst produced 1,2-octanediol (326 μmol) with selectivity of 63%. In contrast, no diol was produced when silica-titania aerogel was used.

Item Type:Article
Uncontrolled Keywords:Chemical properties, catalysis,Sol–gel, aerogel and solution chemistry, aerogels, tin oxide, X-ray diffraction
Subjects:Q Science > QD Chemistry
Divisions:Science
ID Code:7346
Deposited By: Maznira Sylvia Azra Mansor
Deposited On:01 Jan 2009 07:20
Last Modified:01 Jan 2009 07:20

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