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Effect of Potassium on the Physiochemical and Catalytic Characteristics of V2O5/TiO2 Catalysts in o-Xylene Partial Oxidation to Phthalic Anhydride

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Abstract

Abstract

Vanadia species formed on the surface depend on the K/V atomic ratio. At small K/V ratios, Raman spectra show the formation of the K-doped and K-perturbed monomeric species. At K/V = 1, kristalline KVO3 is mainly present on the surface. In situ high temperature XRD-results exhibit a promoting effect on the anatase to rutile phase transformation in the presence of 0.03 and 0.21 wt% potassium. Large amount of K (3 wt%) provides thermal stability of V/Ti/O catalyst and no transformation is found up to 600 °C. Reduction of vanadia K-doped vanadia catalysts is moved to higher temperatures than for the catalyst without potassium. The catalyst having 0.21 wt% K possesses the highest activity in o-xylene oxidation. Furthermore, the K-doped monomeric vanadia species in this catalyst leads to a promoted adsorption or a prevented desorption of phthalide, resulting in a decreased selectivity towards phthalide and COx and a increased PA selecticity.

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Authors and Affiliations

  1. Faculty of Chemistry, Institute of Chemical Technology, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany

    Philipp Eversfield, Wenjing Liu & Elias Klemm

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  1. Philipp Eversfield
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  2. Wenjing Liu
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  3. Elias Klemm
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Correspondence to Philipp Eversfield or Elias Klemm.

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Eversfield, P., Liu, W. & Klemm, E. Effect of Potassium on the Physiochemical and Catalytic Characteristics of V2O5/TiO2 Catalysts in o-Xylene Partial Oxidation to Phthalic Anhydride. Catal Lett 147, 785–791 (2017). https://doi.org/10.1007/s10562-017-1972-1

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  • DOI: https://doi.org/10.1007/s10562-017-1972-1

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