Abstract
A series of SBA-15 with varying textural and surface properties were systematically prepared by post-synthesis and followed by modification with chromium oxide using incipient wetness impregnation method. They were characterized by SAXS, XRD, N2 adsorption, XPS, 29Si MAS NMR, TG, UV-vis and Raman. The catalytic performances of these CrOx supported catalysts in ethane dehydrogenation in the presence of CO2 were investigated. The amount of silanols on SBA-15 surface was found to be crucial for high activity in ethane dehydrogenation. The surface silanols can be eliminated by calcination at high temperature, and recovered by rehydroxylation with diluted H2O2. High catalytic activity comes from good dispersion of CrOx species, which can only be obtained on the silanol-abundant surface.
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