Support Shape Effect in Metal Oxide Catalysis: Ceria-Nanoshape-Supported Vanadia Catalysts for Oxidative Dehydrogenation of Isobutane

The support effect has long been an intriguing topic in catalysis research. With the advancement of nanomaterial synthesis, the availability of faceted oxide nanocrystals provides the opportunity to gain unprecedented insights into the support effect by employing these well-structured nanocrystals....

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Published inThe journal of physical chemistry letters Vol. 3; no. 11; pp. 1517 - 1522
Main Authors Wu, Zili, Schwartz, Viviane, Li, Meijun, Rondinone, Adam J, Overbury, Steven H
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 07.06.2012
Subjects
Surfaces, Interfaces, Porous Materials, and Catalysis
support effect
ceria
surface structure
shape
defects
vanadia
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Summary:The support effect has long been an intriguing topic in catalysis research. With the advancement of nanomaterial synthesis, the availability of faceted oxide nanocrystals provides the opportunity to gain unprecedented insights into the support effect by employing these well-structured nanocrystals. In this Letter, we show by utilizing ceria nanoshapes as supports for vanadium oxide that the shape of the support poses a profound effect on the catalytic performance of metal oxide catalysts. Specifically, the activation energy of VO x /CeO2 catalysts in oxidative dehydrogenation of isobutane was found to be dependent on the shape of ceria support, rods < octahedra, closely related to the surface oxygen vacancy formation energy and the numbe of defects of the two ceria supports with different crystallographic surface planes.
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ISSN:1948-7185
1948-7185
DOI:10.1021/jz300513u