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Multinuclear solid-state NMR of ceria zirconia and hybrid perovskite systems
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Carver, Adam John (2021) Multinuclear solid-state NMR of ceria zirconia and hybrid perovskite systems. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3869896
Abstract
Solid-state NMR has been applied alongside other characterisation techniques such as Raman spectroscopy and pXRD, and with the aid of DFT calculations via CASTEP to investigate ceria-zirconia materials and a variety of organic-inorganic hybrid perovskites. NMR is a technique that has not widely been utilised before on these materials but has proved to further elucidate their properties.
Ceria (CeO2) is a very sought after material due to its broad range of uses in the medical field, as a catalyst, and as a non-inert support, particularly in catalytic converters. This is largely due it being able to reversibly change the oxidation state of the cerium nucleus from Ce4+ to Ce3+. This leads to these systems having an oxygen storage capacity (OSC) which is ideal in autocatalysis when reducing or oxidising emission gases. To avoid sintering and degradation at high temperatures, CeO2 is stabilised with ZrO2, to form a CeO2-ZrO2 solid solution. These systems, both disordered and ordered, have been labelled with 17O2 gas using a range of redox and straight exchange conditions such that 17O NMR can be utilised. In the disordered ceria-zirconia, solid-state NMR has confirmed that the Zr-O bonds are weaker as they exchange oxygen more readily at lower temperatures. These weak bonds facilitate the improved OSC of this system.
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Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Library of Congress Subject Headings (LCSH): | Nuclear magnetic resonance, Hybrid perovskites, Cerium oxides, Solid state physics, Raman spectroscopy, Catalysis | ||||
Official Date: | December 2021 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Physics | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Hanna, John V. ; Thompsett, David | ||||
Format of File: | |||||
Extent: | xix, 149 pages : illustrations, charts | ||||
Language: | eng |
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