科研之友
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摘要
Raman, UV-vis, and X-ray photoelectron spectroscopy were combined in one experimental setup to directly study the interplay between the structure and dispersion of SBA-15-supported vanadium oxide during dehydration. The fully hydrated catalyst is slightly reduced but consists mainly of V(5+) species with pseudo-octahedral V coordination strongly resembling the xerogel V(2)O(5)-1.2H(2)O. After dehydration, a highly dispersed surface vanadium oxide species with tetrahedrally coordinated vanadium and significantly smaller ensemble size is formed.
- 出版日期2007-5-15
