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Molecular approach to prepare mixed MoW alumina supported hydrotreatment catalysts using H4SiMonW12-nO40 heteropolyacids

Abstract

H4[SiMonW12-nO40] heteropolyacids (HPA) are interesting precursors for the preparation of alumina supported hydrotreating catalysts to introduce simultaneously both metals while maintaining a Mo-W nanoscale proximity. Two heteropolyacids with n = 1 and 3 have been synthesized and used for the first time for preparing hydrotreatment catalysts. The crystal structure refinement has been performed and evidences the formation of β-H4[SiMo3W9O40] with three ordered Mo sites forming a face. The purity of the samples in aqueous solution has been shown from Raman and polarography characterizations. These heteropolyacids were then impregnated on alumina to prepare supported MoW based catalysts. As references, catalysts with same Mo/W ratios have been prepared using monometallic H4SiMo12O40 and H4SiW12O40 HPA (mixture of these 2 HPA in the impregnating solution). EXAFS characterization performed simultaneously at the Mo K and W LIII edges shows mixed heteropolyanion SiMonW12-nO404- preservation at the alumina surface after drying and evidences after sulfidation the mixed “MoW-S2” slabs formation. Better catalytic hydrogenation properties for dibenzothiophene hydrodesulfurization and naphthalene hydrogenation have been obtained when using β-H4[SiMo3W9O40] which is explained by the formation of the mixed “MoW-S2” active phase.

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Publication details

The article was received on 04 Apr 2018, accepted on 09 Sep 2018 and first published on 12 Sep 2018


Article type: Paper
DOI: 10.1039/C8CY00672E
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Molecular approach to prepare mixed MoW alumina supported hydrotreatment catalysts using H4SiMonW12-nO40 heteropolyacids

    M. Nikulshina, P. Blanchard, A. Mozhaev, C. Lancelot, A. Griboval-Constant, M. Fournier, E. Payen, O. Mentré, V. Briois, P. A. Nikulshin and C. Lamonier, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY00672E

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