In situ XANES studies of Titanium sites and their reactivities in nanoporous Titanosilicate frameworks
Abstract
This study focused on the study of titanium sites, their local structure and reactivities in nanoporous titanosilicates frameworks by using in situ X-ray absorption spectroscopy. XANES provide the information on the oxidation state of the titanium species as well as their change in coordination geometry during de- and re-hydration. Results fromin situ XANES studies shows that TS-1 is much more hydrophobic than TiAl or TiFe systems. Pre-edge features of Ti K-edge XANES spectra of these materials also suggested that TiVI is the dominant Ti coordination in dehydrated system whilst TiVI is the dominant in the re-hydrated one.
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