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Determination of the Mo surface environment of Mo/TiO2 catalysts by EXAFS,XANES and PCA |
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| Authors: | Martin J Fay Andrew Proctor Douglas P Hoffmann Marwan Houalla David M Hercules |
| Institution: | (1) Films Division, Mobil Chemical, 14502 Macedon, NY, USA;(2) Martin Marietta Energy Systems, 37830-7272 Oak Ridge, TN, USA;(3) Chemistry Department, University of Pittsburgh, 15260 Pittsburgh, PA, USA |
| Abstract: | The local structure of oxidic Mo/TiO2 catalysts (0.5 to 13.5 wt.% Mo) has been studied using EXAFS and XANES. Both EXAFS and XANES results suggest that the Mo surface phase is octahedrally coordinated for all Mo loadings. The EXAFS results were also examined using principal component analysis (PCA) to determine the number of Mo species present on the Mo/TiO2 catalysts. Results from PCA of the Mo EXAFS spectra suggested the presence of three Mo species: two surface species and bulk MoO3. |
| Keywords: | principal component analysis (PCA) extended X-ray absorption fine structure (EXAFS) catalysts |
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