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The solid-state rearrangement of the Wells-Dawson K6P2W18O62·10H2O to a stable Keggin-type heteropolyanion phase: a catalyst for the selective oxidation of isobutane to isobutene

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Abstract

The thermal and structural stability of the Wells-Dawson-type heteropoly compound K6P2W18O62·10H2O was examined by FT-IR spectroscopy, X-ray powder diffraction, thermogravimetric analysis and HRTEM. It was found that calcination at temperatures higher than 850 K led to the formation of a Keggin-type compound “K3PW12O40”, containing small amounts of an additional phase originated from the high-temperature interaction between potassium phosphate (K3PO4 formed during the decomposition of the K6P2W18O62·10H2O) and the Keggin-type compound itself. The Keggin-type product showed a higher activity in the selective oxidative dehydrogenation of isobutane to isobutene compared to both the Wells-Dawson precursor and to pure, authentic K3PW12O40. This higher activity can be tentatively attributed to the presence of an amorphous layer of unknown stoichiometry at the surface of the thermally rearranged Wells-Dawson compound.

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Authors and Affiliations

  1. Dipartimento di Scienze e Tecnologie Chimiche, Universitá di Udine, via Cotonificio 108, 33100, Udine, Italy

    Clara Comuzzi, Giuliano Dolcetti & Alessandro Trovarelli

  2. Dipartimento di Chimica Industriale e dei Materiali, Viale Risorgimento 4, 40136, Bologna, Italy

    Fabrizio Cavani & Ferruccio Trifirò

  3. Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 647, 08028, Barcelona, Spain

    Jordi Llorca

  4. Department of Chemistry, Colorado State University, 80523, Fort Collins, CO, USA

    Richard G. Finke

Authors
  1. Clara Comuzzi
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  2. Giuliano Dolcetti
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  3. Alessandro Trovarelli
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  4. Fabrizio Cavani
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  5. Ferruccio Trifirò
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  6. Jordi Llorca
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  7. Richard G. Finke
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Comuzzi, C., Dolcetti, G., Trovarelli, A. et al. The solid-state rearrangement of the Wells-Dawson K6P2W18O62·10H2O to a stable Keggin-type heteropolyanion phase: a catalyst for the selective oxidation of isobutane to isobutene. Catal Lett 36, 75–79 (1996). https://doi.org/10.1007/BF00807208

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  • DOI: https://doi.org/10.1007/BF00807208

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