Dynamic nuclear polarization enhanced solid-state NMR studies of surface modification of gamma-alumina
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 b...
| Main Authors: | , , , |
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| Format: | Article |
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Johnson Matthey PLC
2018
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| Online Access: | https://eprints.nottingham.ac.uk/50554/ |
| _version_ | 1848798281168060416 |
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| author | Mais, Marco Paul, Subhradip Barrow, Nathan S. Titman, Jeremy J. |
| author_facet | Mais, Marco Paul, Subhradip Barrow, Nathan S. Titman, Jeremy J. |
| author_sort | Mais, Marco |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T20:17:16Z |
| format | Article |
| id | nottingham-50554 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T20:17:16Z |
| publishDate | 2018 |
| publisher | Johnson Matthey PLC |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-505542020-05-04T19:32:05Z https://eprints.nottingham.ac.uk/50554/ Dynamic nuclear polarization enhanced solid-state NMR studies of surface modification of gamma-alumina Mais, Marco Paul, Subhradip Barrow, Nathan S. Titman, Jeremy J. 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. Johnson Matthey PLC 2018-07-01 Article PeerReviewed Mais, Marco, Paul, Subhradip, Barrow, Nathan S. and Titman, Jeremy J. (2018) Dynamic nuclear polarization enhanced solid-state NMR studies of surface modification of gamma-alumina. Johnson Matthey Technology Review, 62 (3). pp. 271-278. ISSN 2056-5135 http://www.ingentaconnect.com/content/matthey/jmtr/2018/00000062/00000003/art00004;jsessionid=18s609d2rdtsr.x-ic-live-02 doi:10.1595/205651318X696765 doi:10.1595/205651318X696765 |
| spellingShingle | Mais, Marco Paul, Subhradip Barrow, Nathan S. Titman, Jeremy J. Dynamic nuclear polarization enhanced solid-state NMR studies of surface modification of gamma-alumina |
| title | Dynamic nuclear polarization enhanced solid-state NMR studies of surface modification of gamma-alumina |
| title_full | Dynamic nuclear polarization enhanced solid-state NMR studies of surface modification of gamma-alumina |
| title_fullStr | Dynamic nuclear polarization enhanced solid-state NMR studies of surface modification of gamma-alumina |
| title_full_unstemmed | Dynamic nuclear polarization enhanced solid-state NMR studies of surface modification of gamma-alumina |
| title_short | Dynamic nuclear polarization enhanced solid-state NMR studies of surface modification of gamma-alumina |
| title_sort | dynamic nuclear polarization enhanced solid-state nmr studies of surface modification of gamma-alumina |
| url | https://eprints.nottingham.ac.uk/50554/ https://eprints.nottingham.ac.uk/50554/ https://eprints.nottingham.ac.uk/50554/ |