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Physical properties and bifunctional catalytic performance of phosphate-vanadium impregnated silica-titania aerogel

Lee, Siew Ling and Nur, Hadi and Hamdan, Halimaton (2009) Physical properties and bifunctional catalytic performance of phosphate-vanadium impregnated silica-titania aerogel. Catalysis Letters, 132 (1-2). 28 -33. ISSN 1011-372X

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Official URL: http://dx.doi.org/10.1007/s10562-009-0040-x

Abstract

The excellent catalytic performance of phosphate-vanadium impregnated silica-titania aerogel as a bifunctional oxidative and acidic catalyst was evaluated in consecutive transformation of 1-octene to 1,2-octanediol through formation of 1,2-epoxyoctane using aqueous H2O2. Phosphate group and vanadium were impregnated onto silica-titania aerogel via wet impregnation method at room temperature, followed by a high calcination temperature. Significant increase of hydrated, tetrahedrally coordinated Ti species was found in phosphate-vanadium impregnated silica-titania sample. Pyridine adsorption study revealed that the combination of phosphate group and vanadium is essential for generation of Brønsted acidic sites. Phosphate-vanadium impregnated silica-titania catalyst produced 1,2-octanediol (275 µmol) with selectivity of 65%. In contrast, no noticeable diol was produced when silica-titania aerogel and phosphate treated silica-titania sample were used.

Item Type:Article
Uncontrolled Keywords:bifunctional catalyst, brønsted acidity, phosphate, silica-titania aerogel, vanadium
Subjects:Q Science > QD Chemistry
Divisions:Science
ID Code:13051
Deposited By: Liza Porijo
Deposited On:15 Jul 2011 01:43
Last Modified:15 Jul 2011 01:43

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