Characterization of V-Mo-W Mixed Oxide Catalyst Surface Species by 51V Solid-State Dynamic Nuclear Polarization NMR

Thankamony AS, Knoche S, Bothe S, Drochner A, Jagtap AP, Sigurdsson ST, Vogel H, Etzold BJ, Gutmann T, Buntkowsky G (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Journal of Physical Chemistry C American Chemical Society

Book Volume: 121

Pages Range: 20857-20864

Journal Issue: 38

DOI: 10.1021/acs.jpcc.7b06761

Abstract

The investigation of V-Mo-W mixed oxide catalysts by ⁵¹V DNP MAS NMR is reported. It is shown that the ⁵¹V NMR signal from surface near vanadium nuclei was enhanced by a factor of ≈50 by direct polarization transfer from unpaired electrons to ⁵¹V nuclei. The dependency of the DNP enhancement of the samples on different polarizing mixtures is investigated and complemented by EPR studies. V-Mo-W mixed oxide catalysts with different stoichiometry (V2Mo8W0.5Oy, V2Mo8W1Oy, and V2Mo8W1.5Oy) are compared, and a suitable assignment of ⁵¹V signals to different phases that are present near to the catalysts surfaces is given. Finally, the applicability of DNP solid-state NMR for the characterization of V-Mo-W mixed oxide catalysts is discussed in terms of the synthesis conditions (i.e., pH-value). (Graph Presented).

Authors with CRIS profile

Bastian Etzold

Involved external institutions

Technische Universität Darmstadt

Germany (DE) University of Iceland (UI) / Háskóli Íslands

Iceland (IS)

How to cite

APA:

Thankamony, A.S., Knoche, S., Bothe, S., Drochner, A., Jagtap, A.P., Sigurdsson, S.T.,... Buntkowsky, G. (2017). Characterization of V-Mo-W Mixed Oxide Catalyst Surface Species by 51V Solid-State Dynamic Nuclear Polarization NMR. Journal of Physical Chemistry C, 121(38), 20857-20864. https://doi.org/10.1021/acs.jpcc.7b06761

MLA:

Thankamony, Aany S.L., et al. "Characterization of V-Mo-W Mixed Oxide Catalyst Surface Species by 51V Solid-State Dynamic Nuclear Polarization NMR." Journal of Physical Chemistry C 121.38 (2017): 20857-20864.

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