Abstract
Abstract The molecular structure of the surface vanadium oxide species present on different oxide supports (TiO 2 , γ-Al 2 O 3 , and SiO 2 ) were determined by laser Raman spectroscopy and 51 V solid state NMR under hydrated and dehydrated conditions. The structure of the vanadium oxide species changes with dehydration and a four coordinated vanadium oxide species with a short terminal bond was present on all oxide supports considered. The reactivity of the supported vanadium oxide catalysts was determined via the methanol oxidation reaction. Correlation of the structure and reactivity data indicate the strength of the bridging, vanadium-oxygen-support, bond to be controlling the activity of these supported vanadium oxide catalysts. The effect of promoters/impurities on 1% V 2 O 5 /TiO 2 catalyst depends on their acid/base nature. Basic promoters titrate the vanadium oxide site and destroy the vanadium-oxygen-support bond of the parent 1% V 2 O 5 /TiO 2 . Acidic promoters/impurities coordinate to the support and do not show any appreciable change to the structure, reactivity, and the vanadium-oxygen-support bond of the parent 1% V 2 O 5 /TiO 2 .
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
