Pt LIII-edge XANES and EXAFS studies on γ-Al2O3 supported Pt catalysts |
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| Authors: | Jifei Jia Yuan Kou Liwu Lin Zhusheng Xu Tao Zhang Jianzhong Niu and Dongbai Liang |
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| Affiliation: | (1) Dalian Institute of Chemical Physics, Chinese Academy of Sciences, P.O.Box 110, 116023 Dalian, P. R. China;(2) State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, 730000 Lanzhou, P.R. China |
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| Abstract: | Pt LIII-edge XANES and EXAFS were employed to investigate the nature of Pt/γ-Al2O3, Pt−Sn/γ-Al2O3 and Pt−Fe/γ-Al2O3 catalysts. The results indicated that Pt species on these catalysts were all in the oxidized states before reduction, and
in the metallic states after reduction. The dispersity of the Pt species on the catalysts was very high after reduction. The
electronic properties of the highly dispersed Pt species were different from that of the bulk Pt in large crystallites. An
interaction between Pt and the metal-oxide modified γ-Al2O3 support is proposed. The interaction improved the dispersity of the Pt species on the catalysts and is thought to be the
reason for the enhanced activity and selectivity for dehydrogenation reactions over these catalysts. |
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| Keywords: | XANES Pt γ -Al2O3 |
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