Study of the state of rhodium in the potassium rhodiumundecatungstosilicate/alumina system by diffuse-reflectance IR spectroscopy |
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| Authors: | P A Korovchenko R A Gazarov L M Kustov |
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| Institution: | 1. I. M. Gubkin State University of Oil and Gas, 65 Leninsky prosp, 117917, Moscow, Russian Federation
2. N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 117913, Moscow, Russian Federation
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| Abstract: | Adsorption of CO on the catalytic system K5SiW11RhO39]/Al2O3 was studied by diffuse-reflectance IR spectroscopy. The electronic state of rhodium and thermal stability of the system in
the redox cycles were studied. The oxidized heteropolycompound (HPC) contains the charged forms Rh+, Rh2+, and Rh3+. Their ratio strongly depends on the pre-treatment temperature of the sample. In the reduced HPC two main forms of rhodium
exist: the ionic Rh+ and metallic Rh0. The supported HPC structure is stable in an oxidative medium at temperatures below ∼900 K. The properties of the K5SiW11RhO39]/Al2O3 system are retained in the redox cycles up to ∼670 K, and the highly dispersed state of rhodium is observed up to 900 K. |
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