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Issue 110, 2014
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Redox-driven atomic-scale changes in mixed catalysts: VOX/WOX/α-TiO2 (110)

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X-ray studies of vanadium–tungsten mixed-monolayer-oxide catalysts grown on the rutile α-TiO2 (110) single crystal surface show redox behavior not observed for lone supported vanadium or tungsten oxides. Two cases are presented: sub-monolayer (sub-ML) vanadium oxide (vanadia) grown on ML tungsten oxide and ML vanadia grown on sub-ML tungsten oxide. The X-ray standing wave (XSW) and X-ray photoelectron spectroscopy (XPS) observations for both cases show coverage-dependent reversible redox-induced atomic-scale structural and chemical state changes. Atomic force microscopy shows that the mixed VOX/WOX overlayers have a conformal film-like structure in the as-deposited state. XSW analysis in light of XPS reveals that the V and W cations that are uncorrelated with the substrate lattice play an important role in catalytic redox reactions. Distinct differences in the redox-induced changes for these two mixed catalysts result from tuning the ratio of V to W, and relationships are drawn between the catalyst composition, structure, and chemistry. Comparison of these V–W mixed cases and the corresponding unmixed cases reveals a synergistic effect in which the reduction of W can be significantly enhanced by the addition of V.

Graphical abstract: Redox-driven atomic-scale changes in mixed catalysts: VOX/WOX/α-TiO2 (110)

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The article was received on 08 Oct 2014, accepted on 20 Nov 2014 and first published on 20 Nov 2014

Article type: Paper
DOI: 10.1039/C4RA14140G
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RSC Adv., 2014,4, 64608-64616

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    Redox-driven atomic-scale changes in mixed catalysts: VOX/WOX/α-TiO2 (110)

    Z. Feng, M. E. McBriarty, A. U. Mane, J. Lu, P. C. Stair, J. W. Elam and M. J. Bedzyk, RSC Adv., 2014, 4, 64608
    DOI: 10.1039/C4RA14140G

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