Dynamic nuclear polarisation (DNP) gives large (>100-fold) signal enhancements in solid-state nuclear magnetic resonance (solid-state NMR) spectra via the transfer of spin polarisation 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 γ-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 γ-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 barium oxide.
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Document Type: Research Article
July 1, 2018
This article was made available online on May 30, 2018 as a Fast Track article with title: "Dynamic Nuclear Polarization Enhanced Solid-state NMR Studies of Surface Modification of gamma-Alumina ".
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