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Synthesis and characterization of acid modified silica-titania aerogel as oxidative-acidic bifunctional catalyst

Lee, Siew Ling and Nur, Hadi and Pei, Wen Koh and Mohd. Ekhsan, Jamilah and Soo, Chien Wei (2011) Synthesis and characterization of acid modified silica-titania aerogel as oxidative-acidic bifunctional catalyst. International Journal of Advanced Research in Computer Science, 1 (1). pp. 43-47. ISSN 2010-362X

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Official URL: http://dx.doi.org/10.7763/IJAPM.2011.V1.9

Abstract

Acid treatment using H2SO4, HCl and H3PO4 has been carried out in an attempt to improve catalytic performance of silica-titania aerogel. X-ray diffraction results showed the amorphous structure of the aerogels remained after the acid impregnation and calcinations steps. Hammert analysis revealed these acid modified silica-titania aerogels were superacids with pKa < -14.52. Different Ti species was observed in the samples upon the acid treatment. As compared to silica-titania aerogel, Lewis acidity increased remarkably in HCl treated sample without formation of any Brønsted acid site. Meanwhile, H2SO4 and H3PO4 treated samples possessed both Lewis and Brønsted acid sites. The catalytic performance of these samples was evaluated through a consecutive transformation of 1-octene to 1,2-octanediol through the formation of 1,2-epoxyoctane using aqueous hydrogen peroxide as oxidant.

Item Type:Article
Uncontrolled Keywords:Bifunctional catalyst, Brønsted acidity, oxidative site, silica-titania aerogel
Subjects:Q Science
Divisions:Science
ID Code:39935
Deposited By: Fazli Masari
Deposited On:21 Jul 2014 13:20
Last Modified:05 Mar 2019 09:34

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