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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/3350

Title: An in situ FT-IR study of photo-oxidation of alcohols over uranyl-anchored MCM-41: Possible reaction pathways
Authors: VIDYA, K
KAMBLE, VS
GUPTA, NM
SELVAM, P
Keywords: photocatalytic oxidation
reaction-mechanisms
tio2
ethanol
photochemistry
ion
nanoparticles
surfaces
behavior
sunlight
Issue Date: 2007
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Citation: JOURNAL OF CATALYSIS, 247(1), 1-19
Abstract: Photosensitive uranyl ions anchored onto MCM-41 mesoporous molecular sieves serve as remarkable photocatalysts in the degradation of alcohols, under ambient conditions of light, temperature, and air. The rates of conversion of alcohols to carbon dioxide was found to decrease in the order methanol > ethanol > 2-propanol > 1-propanol, with the difference in reactivity attributed to the stability of the carbon-centered radicals formed during photo-oxidation. Kinetics revealed that the photo-oxidation of alcohols followed a first-order reaction. A detailed in situ FT-IR analysis was used to identify the transient species formed during the photo-oxidation of ethanol and 2-propanof over uranyl-anchored photocatalyst. Acetic acid, ethyl acetate, and acetaldehyde were the intermediates obtained over UO22+/MCM-41 during photo-oxidation of ethanol, whereas acetate species, methyl acetate, and acetone were detected during photo-oxidation of 2-propanol. Based on the intenriediate species formed, their growth with respect to irradiation time, and their intensities, appropriate reaction mechanisms were proposed to corroborate our observations. (c) 2007 All fiahts reserved.
URI: http://dx.doi.org/10.1016/j.jcat.2007.01.007
http://dspace.library.iitb.ac.in/xmlui/handle/10054/3350
http://hdl.handle.net/10054/3350
ISSN: 0021-9517
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