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An in situ FT-IR study of photo-oxidation of alcohols over uranyl-anchored MCM-41: Possible reaction pathways

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Title An in situ FT-IR study of photo-oxidation of alcohols over uranyl-anchored MCM-41: Possible reaction pathways
 
Creator VIDYA, K
KAMBLE, VS
GUPTA, NM
SELVAM, P
 
Subject photocatalytic oxidation
reaction-mechanisms
tio2
ethanol
photochemistry
ion
nanoparticles
surfaces
behavior
sunlight
mesoporous
mcm-41
uranyl
alcohols
photo-oxidation
in situ ir
 
Description 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.
 
Publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
 
Date 2011-07-12T14:23:04Z
2011-12-26T12:48:55Z
2011-12-27T05:34:27Z
2011-07-12T14:23:04Z
2011-12-26T12:48:55Z
2011-12-27T05:34:27Z
2007
 
Type Article
 
Identifier JOURNAL OF CATALYSIS, 247(1), 1-19
0021-9517
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
 
Language en