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

16th International Conference on X-ray Absorption Fine Structure

Ichikuni, N.^1 ; Yanagase, F.^1 ; Mitsuhara, K.^2 ; Hara, T.^1 ; Shimazu, S.^1

Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, Chiba, Japan^1

Research Organization of Science and Technology, Ritsumeikan University, Kusatsu, Japan^2

关键词: Carburization process;    Mesoporous Silica;    Nb carbide;    Reduced pressure;    Sba-15 supports;    Threshold energy;    XAFS measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012060/pdf
DOI  :  10.1088/1742-6596/712/1/012060

来源: IOP

【 摘 要 】

Mesoporous silica SBA-15 supported NbC catalysts were prepared under reduced pressure of CH4-H2gas 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.