The state of palladium in the system potassium palladium-11-tungstosilicate on aluminosilicate as studied by DRIFT spectroscopy |
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| Authors: | Vladimirov N A Korovchenko P A Gazarov R A Kustov L M Ivanov A V |
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| Institution: | (1) I. M. Gubkin State University of Oil and Gas, 65 Leninsky prosp., 119991 Moscow, Russian Federation;(2) N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation |
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| Abstract: | The influence of redox treatments on the state of palladium in the heteropoly acid K6SiW11PdO39] supported on amorphous aluminosilicate was studied by diffuse-reflectance IR spectroscopy using CO as a probe molecule. A bulk sample of the K6SiW11PdO39]·11H2O heteropoly compound (HPC) was studied for comparison. The deposition of the bulk sample on aluminosilicate leads to the partial decomposition of Keggin structure and to the removal of palladium cations from the HPC framework. The metal introduced into the K6SiW11PdO39]/SiO2-Al2O3 system within HPC displays higher thermal stability in redox cycles compared to that of the bulk HPC. A highly dispersed state of palladium persists up to 573 K. |
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| Keywords: | heteropoly compound potassium palladium-11-tungstosilicate Keggin structure palladium electronic state of metal thermal stability diffuse-reflectance FTIR spectroscopy |
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