Abstract
Mesoporous silica SBA-15 supported NbC catalysts were prepared under reduced pressure of CH4-H2 gas in a closed circulating system. Nb K- and L3-edges XAFS measurements revealed that small NbC cluster formed on SBA-15 support and gradual carburization process by lengthening the carburization temperature-maintaining period. Carburization degree of Nb species was clearly explained by using threshold energy shift of Nb L3-edge XANES profile.
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