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Polyoxometalate catalysts with co-substitution of VO2+ and transition metals and their catalytic performance in isobutane oxidation

Abstract

The Cs-salts of Keggin-type phosphomolybdic acid with simultaneously doping of VO2+ and different transition metals have been prepared, characterized and tested as catalysts in the oxidation of isobutane to methacrylic acid under isobutane-rich conditions. The results showed that co-substitution of VO2+ and Cu at the secondary structure exhibited a higher catalytic performance than those with co-doping of VO2+ and other transition metals, such as Fe, Ni and Ce. This difference has been explained by the existence of synergetic effect between Cu and VO2+ only in the secondary structure. This synergetic effect was related to a charge transfer between Mo6+ in the Keggin anions and Cu counter-cation which promoted the re-oxidation of the catalyst and consequently its catalytic activity.

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Publication details

The article was received on 30 May 2018, accepted on 03 Oct 2018 and first published on 04 Oct 2018


Article type: Paper
DOI: 10.1039/C8CY01101J
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Polyoxometalate catalysts with co-substitution of VO2+ and transition metals and their catalytic performance in isobutane oxidation

    Y. Liu, J. He, W. Chu and W. Yang, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY01101J

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