Nb K- and L3-edges XAFS study on the structure of supported Nb carbide catalyst

Nb K- and L3-edges XAFS study on the structure of supported Nb carbide catalyst

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 tempera...

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Veröffentlicht in:Journal of physics. Conference series 2016-05, Vol.712 (1)
Hauptverfasser: Ichikuni, N, Yanagase, F, Mitsuhara, K, Hara, T, Shimazu, S
Format: Artikel
Sprache:eng
Schlagworte:
Carburization (corrosion)
Carburizing
Catalysts
Niobium carbide
Physics
Silicon dioxide
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Zusammenfassung: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.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/712/1/012060