Interactions between Surface Vanadate and Surface Sulfate Species on Metal Oxide Catalysts

Autor:	Jih-Mirn Jehng, Joseph P. Dunn, Israel E. Wachs, Laura E. Briand, and Harvey G. Stenger, Du Soung Kim
Rok vydání:	1998
Předmět:	Inorganic chemistry Oxide Surfaces Coatings and Films Catalysis Metal chemistry.chemical_compound Sulfation Adsorption chemistry visual_art Monolayer Materials Chemistry visual_art.visual_art_medium Vanadate Physical and Theoretical Chemistry Sulfate
Zdroj:	The Journal of Physical Chemistry B. 102:6212-6218
ISSN:	1520-5207 1520-6106
DOI:	10.1021/jp9814247
Popis:	The interactions between surface sulfate and surface vanadate species present on sulfated supported vanadia catalysts under dehydrated conditions have been investigated with infrared and Raman spectroscopies. The surface sulfate species present on sulfated TiO2, ZrO2, and Al2O3 supports and V2O5/TiO2, V2O5/ZrO2, and V2O5/Al2O3 catalysts have identical molecular structures, i.e., (M−O)3SO, where M = Ti, Zr, or Al. Interactions between the surface vanadia and surface sulfate species do not lead to the formation of sulfate−vanadate compounds. The surface sulfate species on the V2O5/TiO2, V2O5/ZrO2, and V2O5/Al2O3 catalysts anchor to and displace only the most basic support hydroxyls, while the surface vanadate species titrate both basic and neutral support hydroxyls forming a complete close-packed monolayer. At low V2O5 loadings, the surface vanadia species on these catalysts preferentially titrate basic hydroxyls, which consumes the sites capable of sulfate adsorption. Thus, the amount of adsorbed surface s...
Databáze:	OpenAIRE
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