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RevistaJournal of American Chemical Society
Año2010
Volumen132
Páginas2345
Internacional

Role of Ceria in Oxidative Dehydrogenation on Supported Vanadia Catalysts

Autores:María Verónica Ganduglia Pirovano, Cristina Popa , J. Sauer , Heather Abbott , Alexander Uhl , Martin Baron , Dario Stacchiola , Oleksandr Bondarchuk , Shamil Shaikhutdinov , H.-J. Freund
Grupos de investigación:Catálisis Teórica y Modelización
The effect of the suppport on oxidative dehydrogenation activity for vanadia/ceria systems is examined for the oxidation of methanol to formaldehyde by use of well-defined VO(x)/CeO(2)(111) model catalysts Temperature-programmed desorption at low vanadia loadings revealed reactivity at much lower temperature (370 K) as compared to pure ceria and vanadia on inert supports such as silica Density functional theory is applied and the energies of hydrogenation and oxygen vacancy formation also predict an enhanced reactivity of the vanadia/ceria system At the origin of this support effect is the ability of ceria. to stabilize reduced states by accommodating electrons in localized f-states.
Palabras clave:FORMALDEHYDE, RUTILE TIO2(110), METAL-OXIDE, PROPANE, SELECTIVE OXIDATION, OXIDE CATALYSTS, METHANOL OXIDATION, THIN-FILMS, CEO2(111), SILICA
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