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EXAFS characterization of Ti/Al2O3 supports and Co/Ti/Al2O3 catalysts |
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| Authors: | Martin J. Fay Andrew Proctor Douglas P. Hoffmann Marwan Houalla David M. Hercules |
| Affiliation: | (1) Department of Chemistry, University of Pittsburgh, 15260, PA, USA;(2) Present address: Precision Printing, 801 Alfred Thun Rd., 370yO Clarksville, TN, USA;(3) Present address: Martin Marietta Energy Systems, MS-7272, P.O. Box 2003, 37830-7272 Oak Ridge, TN, USA;(4) Present address: Department of Chemistry, Vanderbilt University, Box 1822B, 37235 Nashville, Tennessee, USA |
| Abstract: | The structure of Ti/Al2O3 supports (0–14 wt% Ti) and Co/Ti/Al2O3 catalysts (3 wt% Co) was examined by EXAFS. The results indicated that the Ti was present primarily as a highly dispersed surface phase. The Ti EXAFS results indicated that the Ti species were octahedrally coordinated. Evidence of Ti—Ti interactions was found for all loadings (2–14 wt% Ti) suggesting that the Ti surface species are present as small clusters of TiO2.The Co EXAFS results showed evidence for several structurally different Co surface phases as a function of Ti loading. Evidence of a Co species interacting with the Ti surface phase was observed for the 3% Co/2% Ti-3%Co/6%Ti catalysts. At the highest loadings studied, 3%Co/8%Ti and 3%Co/14%Ti, evidence was found for a CoTiO3-like phase. |
| Keywords: | Co EXAFS titania alumina supports Ti EXAFS cobalt/titania-alumina catalysts characterization of Co/Ti/Al2O3 catalysts |
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