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

Aany S.L. Thankamony, Stefan Knoche, Sarah Bothe, Alfons Drochner, Anil P. Jagtap, Snorri Th Sigurdsson, Herbert Vogel, Bastian J.M. Etzold, Torsten Gutmann*, Gerd Buntkowsky

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

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).

Original languageEnglish
Pages (from-to)20857-20864
Number of pages8
JournalJournal of Physical Chemistry C
Volume121
Issue number38
DOIs
Publication statusPublished - 28 Sep 2017

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Publisher Copyright:
© 2017 American Chemical Society.

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