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Investigation of the state of palladium in the potassium palladium-11-tungstosilicate/alumina system by diffuse-reflectance IR spectroscopy

  • Physical Chemistry
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Abstract

The influence of redox treatments on the state of palladium in the K6[SiW11PdO39]·11H2O/γ-Al2O3 system was investigated by diffuse-reflectance IR (DRIFT) spectroscopy using CO as a probe molecule. The K6[SiW11PdO39]·11H2O heteropoly-compound (HPC) and starting γ-Al2O3 support were studied for comparison. It was shown that palladium is present in HPC mainly in the form of Pd2+ ions. Treatment of HPC in an H2 flow results in complete reduction of palladium to Pd0. The HPC is unstable in redox cycles at temperatures above 373 K. When the HPC was supported on alumina, the Keggin units were stabilized on the support surface and Pd+ formed in the oxidized sample. The supported K6[SiW11PdO39]·11H2O/γ-Al2O3 catalyst displays higher thermal stability and does not decompose during redox treatments at temperatures up to 723 K.

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Authors and Affiliations

  1. I. M. Gubkin State University of Oil and Gas, 65 Leninsky prosp., 117917, Moscow, Russian Federation

    P. A. Korovchenko & R. A. Gazarov

  2. N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 117913, Moscow, Russian Federation

    A. Yu. Stakheev & L. M. Kustov

Authors
  1. P. A. Korovchenko
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  2. R. A. Gazarov
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  3. A. Yu. Stakheev
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  4. L. M. Kustov
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya. No. 7, pp. 1271–1275. July, 1999.

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Korovchenko, P.A., Gazarov, R.A., Stakheev, A.Y. et al. Investigation of the state of palladium in the potassium palladium-11-tungstosilicate/alumina system by diffuse-reflectance IR spectroscopy. Russ Chem Bull 48, 1261–1265 (1999). https://doi.org/10.1007/BF02495286

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  • DOI: https://doi.org/10.1007/BF02495286

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