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Title: Hydroxyapatite in carbon capture and CO2 utilisation
Author: Nowicki, Duncan Alexander
ISNI:       0000 0004 8498 4827
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 2019
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There is an immediate need for anthropogenic greenhouse gas emissions to approach net-zero if the impacts of future climate change are to be mitigated. Whilst carbon capture & storage (CCS) offers a route for reducing the emission of CO2 from large point sources such as fossil fuel power stations, improvements in the economic case are required before this technology can become viable on a significant scale. Pathways by which the economics of CCS could be improved include the development of more energy-efficient techniques for capture and also via the conversion of captured CO2 gas into value-added products that can be sold to generate revenue. With this in mind, the purpose of this thesis was to assess the potential of the calcium phosphate hydroxyapatite (HA) in carbon capture and CO2 utilisation. A range of carbonated hydroxyapatite (CHA) materials which could have viable real-world applications were prepared. Characterisation of these compositions revealed that phase-pure CHAs with high levels of carbonate incorporation could be prepared using simple, relatively benign, aqueous precipitation reactions at room temperature. Although not essential to achieve high degrees of carbonation in these materials, additional carbonate could be incorporated via a heat treatment in dry CO2. A number of the prepared apatites then proved to be functional CO2 sorbents for carbon capture at 500°C, with relatively stable reactivates over several carbonation-calcination cycles. These tests also revealed that the CO2 carrying capacity of HA could be improved by substituting potassium and carbonate ions for calcium and phosphate ions respectively. Whilst the work presented in this thesis provides clear initial support for HA in carbon capture and CO2 utilisation, further testing of the synthesised materials in prospective applications, including carbon capture, is required before a final conclusion can be reached.
Supervisor: Gibson, Iain R. ; Skakle, Jan M. S. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Hydroxyapatite ; Carbon sequestration ; Carbon dioxide