Silica supported amorphous molybdenum catalysts prepared via sol–gel method and its catalytic activity

Adam, Farook and Mohamed Iqbal, Mohammad Anwar (2011) Silica supported amorphous molybdenum catalysts prepared via sol–gel method and its catalytic activity. Microporous And Mesoporous Materials, 141 (1-3). pp. 119-127. ISSN 1387-1811

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Abstract

Silica supported amorphous molybdenum catalysts had been synthesized in alkali, neutral and acidic medium via sol–gel technique. The catalysts were found to be amorphous and free from bulk MoO3. UV–Vis diffuse reflectance analysis and XPS analysis indicated the co-existence of Mo5+ and Mo6+ species when the incorporation was done in acidic medium. The catalytic activity was tested in the liquid phase oxidation of styrene by using hydrogen peroxide as oxidant. The catalyst prepared in acidic medium showed better catalytic activity compared to the catalysts prepared in alkali and neutral medium. The co-existence of Mo5+ and Mo6+ species is believed to enhance the catalytic activity. Benzaldehyde was the major product detected. The structure of the catalyst was proposed based on the results obtained from XPS, 29Si MAS NMR, UV–Vis diffuse reflectance and FT-IR spectroscopy.

Item Type:	Article (Journal)
Additional Information:	6745/22279
Uncontrolled Keywords:	Amorphous molybdenum–silica catalyst; Oxidation of styrene; Sol–gel technique; Heterogeneous catalyst; Benzaldehyde
Subjects:	Q Science > QD Chemistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Department of Biotechnology
Depositing User:	Dr Mohammad Anwar Mohamed Iqbal
Date Deposited:	14 Dec 2012 14:43
Last Modified:	14 Dec 2012 14:43
URI:	http://irep.iium.edu.my/id/eprint/22279

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