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Study of nano-structured ceria for catalytic CO oxidation
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SYSNO ASEP 0369978 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Study of nano-structured ceria for catalytic CO oxidation Tvůrce(i) Valechha, D. (IN)
Lokhande, S. (IN)
Klementová, Mariana (UACH-T) RID, SAI, ORCID
Šubrt, Jan (UACH-T) SAI, RID
Rayalu, S. (IN)
Labhsetwar, N. (IN)Zdroj.dok. Journal of Materials Chemistry. - : ROYAL SOC CHEMISTRY - ISSN 0959-9428
Roč. 21, č. 11 (2011), s. 3718-3725Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova mesoporous CeO2 ; titania ; alumina ; oxides Vědní obor RIV CA - Anorganická chemie CEZ AV0Z40320502 - UACH-T (2005-2011) UT WOS 000287970500030 DOI 10.1039/c0jm03267k Anotace 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 m(2) g(-1)) and mesopores (32.4 angstrom) 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 degrees 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. Pracoviště Ústav anorganické chemie Kontakt Jana Kroneislová, krone@iic.cas.cz, Tel.: 311 236 931 Rok sběru 2012
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