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Dynamic nuclear polarisation enhanced solid-state nuclear magnetic resonance studies of surface modification of γ-alumina

Mais, Marco; Paul, Subhradip; Barrow, Nathan S.; Titman, Jeremy J.

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Authors

Marco Mais

Subhradip Paul

Nathan S. Barrow

Jeremy J. Titman



Abstract

Dynamic nuclear polarization (DNP) gives large (>100-fold) signal enhancements in solid-state NMR spectra via the transfer of spin polarization from unpaired electrons from radicals implanted in the sample. This means that the detailed information about local molecular environment available for bulk samples from solid-state NMR spectroscopy can now be obtained for dilute species, such as sites on the surfaces of catalysts and catalyst supports. In this paper we describe a DNP-enhanced solid-state NMR study of the widely used catalyst gamma-alumina which is often modified at the surface by the incorporation of alkaline earth oxides in order to control the availability of catalytically active penta-coordinate surface Al sites. DNP-enhanced 27Al solid-state NMR allows surface sites in gamma-alumina to be observed and their 27Al NMR parameters measured. In addition changes in the availability of different surface sites can be detected after incorporation of BaO.

Citation

Mais, M., Paul, S., Barrow, N. S., & Titman, J. J. (2018). Dynamic nuclear polarisation enhanced solid-state nuclear magnetic resonance studies of surface modification of γ-alumina. Johnson Matthey Technology Review, 62(3), 271-278. https://doi.org/10.1595/205651318x696765

Journal Article Type Article
Acceptance Date Feb 14, 2018
Publication Date Jul 1, 2018
Deposit Date Mar 21, 2018
Publicly Available Date Jul 1, 2018
Journal Johnson Matthey Technology Review
Electronic ISSN 2056-5135
Peer Reviewed Peer Reviewed
Volume 62
Issue 3
Pages 271-278
DOI https://doi.org/10.1595/205651318x696765
Public URL https://nottingham-repository.worktribe.com/output/911491
Publisher URL https://www.technology.matthey.com/article/62/3/271-278/

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