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The Impact of the Bulk Structure on Surface Dynamics of Complex Mo–V-based Oxide Catalysts

MPS-Authors
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Trunschke,  Annette
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Noack,  Johannes
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
UniCat-BASF Joint Lab, Technische Universität Berlin, Sekr. EW K 01;

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Girgsdies,  Frank
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Lunkenbein,  Thomas
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Pfeifer,  Verena
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Catalysis for Energy, Group EM-GKAT, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Elektronenspeicherring BESSY II;

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Hävecker,  Michael
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Department of Heterogeneous Reactions, Max-Planck-Institut für Chemische Energiekonversion;

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Kube,  Pierre
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Sprung,  Christoph
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Trunschke_2017_SI.pdf
(Supplementary material), 5MB

Citation

Trunschke, A., Noack, J., Trojanov, S., Girgsdies, F., Lunkenbein, T., Pfeifer, V., et al. (2017). The Impact of the Bulk Structure on Surface Dynamics of Complex Mo–V-based Oxide Catalysts. ACS Catalysis, 7(4), 3061-3071. doi:10.1021/acscatal.7b00130.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-EF32-6
Abstract
Mixed oxides composed of the four metals Mo, V, Te, and Nb are known to be efficient catalysts in selective oxidation of lower alkanes. The outstanding catalytic performance of such mixed oxides is attributed to the presence of the so-called M1 crystal phase that contains all four elements in the metal positions of the structure. In the present work, an M1 phase composed only of Mo and V has been prepared by hydrothermal synthesis. High crystallinity was achieved by applying a synthesis temperature of 200 °C. The phase-pure mixed MoV oxide was studied as catalyst in the oxidation of propane. In contrast to previous reports, the desirable oxidation product acrylic acid is formed over the Te-free M1 structure in significant amounts, implying that Te is not necessarily required as a component of the active ensemble responsible for selective oxygen insertion. The MoV M1 oxide is, however, less selective compared to that of the M1 structure composed of the four metals Mo, V, Te, and Nb. The reason has been determined by applying a combination of synchrotron-based single crystal structure analysis and near-ambient-pressure X-ray photoelectron spectroscopy. Determination of the crystal structure of MoV M1 oxide reveals partial occupation of sites in the hexagonal channels of the M1 structure by V, which are occupied by Te in MoVTeNb M1 oxide. Hydrolysis of the M-O bonds (M = V, Te) under reaction conditions leads to migration of the metal in the hexagonal channels to the surface. Accumulation of more than 50 at % V on the surface of the MoV M1 oxide most likely causes postcombustion of formed acrylic acid, whereas enrichment of Te at the surface of MoVTeNb M1 oxide results in dilution of surface V5+ species and, consequently, high selectivity.