A FTIR assessment of surface acidity and dispersion of surface species in titania and alumina-supported molybdena |
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| Institution: | 1. CNR-ICMATE, Institute of Condensed Matter Chemistry and Technologies for Energy, Via R. Cozzi 53, 20125 Milan, Italy;2. Combustion Sciences and Propulsion Research Branch, Naval Air Warfare Center Weapons Division, 1 Administration Circle, China Lake, CA, 93555, USA |
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| Abstract: | Adsorption of pyridine on the MoO3/TiO2 and MoO3/Al2O3 systems has been studied by FTIR spectroscopy, in order to identify surface acid sites existing in samples with different molybdena loadings. The results show that both Lewis and Brönsted surface acid sites exist, whatever the molybdena loading. The percentage of Brönsted sites is larger for loadings below the theoretical monolayer, and should correspond to bidimensional molybdenum oxides species, while for loadings above the monolayer these sites are associated with bulk MoO3. |
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