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University of Colorado, Boulder

Chemical & Biological Engineering Graduate Theses & Dissertations

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Study Of Redox Reactions For Solar Thermochemical Cycles, Ibraheam Abdulrahman Alshankiti Jan 2018

Study Of Redox Reactions For Solar Thermochemical Cycles, Ibraheam Abdulrahman Alshankiti

Chemical & Biological Engineering Graduate Theses & Dissertations

Solar thermal splitting of water or carbon dioxide is a promising technology for producing hydrogen and/or carbon monoxide. In a two-step cycle, a metal oxide is thermally reduced with concentrated solar radiation to release oxygen. The reduced metal oxide is then re-oxidized with steam or carbon dioxide to produce hydrogen or carbon monoxide. The two-step redox cycle can be operated either as a temperature swing where there is a temperature difference between the reduction and oxidation steps or isothermally. This work discusses various aspects of operating the redox cycle isothermally including redox cycle thermodynamics and overall system efficiency and ...