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Study of nano-structured ceria for catalytic CO oxidation

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Title Study of nano-structured ceria for catalytic CO oxidation
 
Creator Valeccha, Dolly
Lokhande, Suchita
Klementova, Mariana
Subrt, Jan
Rayalu, Sadhana
Labhsetwar, Nitin
 
Subject Materials Science
 
Description Mesoporous, nano-structured ceria has been synthesized using a low-cost biopolymer chitosan as
a template, and the same material has been studied for its CO oxidation activity. The ceria thus
prepared shows low crystallite size (6.5 nm), high surface area (BET-SA 144.2 m2 g�1) and mesopores
(32.4 A ° ) without ordered structure. Different ceria samples have been synthesized by manipulating
the chitosan : cerium ratio and synthesis temperature. These ceria samples have been characterized using
XRD, BET-SA, SEM, FTIR, UV-DRS, PL and TEM techniques. The ceria samples show fluorite
structure with cubic symmetry and increased lattice volume. The nano-structured ceria thus synthesized
lowers the CO oxidation temperature by 30–60 �C as compared to the commercial ceria. The improved
catalytic activity primarily appears to be the effect of improved surface area and pore characteristics
of nano-structured ceria. Also the expansion in lattice cell volume leads to the improvement in redox
properties of ceria, thereby facilitating the formation of surface oxygen vacancies. Such mesoporous ceria
without ordered structure could be useful as an oxidation catalyst as well as a support for various
catalysts. The platinum incorporated mesoporous ceria also shows excellent CO oxidation.
 
Publisher RSC
 
Date 2011
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://neeri.csircentral.net/1035/1/valechha2011.pdf
Valeccha, Dolly and Lokhande, Suchita and Klementova, Mariana and Subrt, Jan and Rayalu, Sadhana and Labhsetwar, Nitin (2011) Study of nano-structured ceria for catalytic CO oxidation. Journal of Materials Chemistry, 21. pp. 3718-3725. ISSN 0959-9428
 
Relation http://pubs.rsc.org/en/journals/journalissues/jm#!issueid=jm022048&type=archive&issnprint=0959-9428
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