Improving the efficiency of a ceria reduction-oxidation cycle through the choice of operating conditions and ceria morphology
2014-05
Loading...
View/Download File
Persistent link to this item
Statistics
View StatisticsJournal Title
Journal ISSN
Volume Title
Title
Improving the efficiency of a ceria reduction-oxidation cycle through the choice of operating conditions and ceria morphology
Authors
Published Date
2014-05
Publisher
Type
Thesis or Dissertation
Abstract
Pathways for improving the efficiency of ceria-based thermochemical cycling for solar-driven fuel production are investigated. First, the operating conditions of an isothermal CO<sub>2</sub> splitting cycle are optimized to improve process efficiency. The optimum conditions are a sweep gas flow rate of 150 mL min<super>-1</super> g<super>-1</super>, a CO<sub>2</sub> flow rate of 50 mL min<super>-1</super> g<super>-1</super>, a reduction time of 100 s, and an oxidation time of 155 s. A quasi-equilibrium model is developed to predict the rates of ceria reduction and oxidation. Finally, a new ceria morphology, wood templated ceria, is used to improve the heterogeneous oxidation reaction rates by maintaining a high surface area when exposed to the extreme temperatures required for ceria reduction. Wood templated ceria performs well at reduction temperatures up to 1400 °C, reaching peak CO production rates of 9 mL min<super>-1</super> g<super>-1</super>, but rates decrease due to sintering when it is reduced at 1500 °C.
Description
University of Minnesota M.S. thesis. May 2014. Major:Mechanical Engineering. Advisor: Dr. Jane H. Davidson. 1 computer file (PDF); xii, 129 pages, appendices A-B.
Related to
Replaces
License
Series/Report Number
Funding information
Isbn identifier
Doi identifier
Previously Published Citation
Suggested citation
De Smith, Robert Michael. (2014). Improving the efficiency of a ceria reduction-oxidation cycle through the choice of operating conditions and ceria morphology. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/169982.
Content distributed via the University Digital Conservancy may be subject to additional license and use restrictions applied by the depositor. By using these files, users agree to the Terms of Use. Materials in the UDC may contain content that is disturbing and/or harmful. For more information, please see our statement on harmful content in digital repositories.