Journal
ENERGY & ENVIRONMENTAL SCIENCE
Volume 11, Issue 3, Pages 648-659Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ee03383d
Keywords
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Funding
- NSF [CBET-1335817, CHE-1531590, IIP-1743623]
- Office of Graduate Studies, USF
- McKnight Dissertation Fellowship by NASA Florida Space Grant Consortium
- Dissertation Improvement Fellowship
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1531590] Funding Source: National Science Foundation
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Conversion of CO2 in a scalable technology has the potential for enormous energy and environmental impact but remains a challenge. We present several stable, earth abundant perovskite oxide materials for the reverse water gas shift chemical looping (RWGS-CL) process as a potential solution for this CO2 mitigation problem. This material and process combination circumvents issues plaguing other emerging technologies, viz. poor rates of CO2 conversion, high operation temperatures, use of precious metal catalysts, or combinations thereof. Using DFT-calculated oxygen vacancy formation energy, a key descriptor for the RWGS-CL process, we have successfully predicted several earth abundant perovskite oxides with high CO2 conversion capability. We simultaneously achieved 100% selective CO generation from CO2 at the highest known rates (approximate to 160 moles per min per gram perovskite oxide) at record low process temperatures of 450-500 degrees C using lanthanum and calcium based perovskite oxides. These materials are stable over several RWGS-CL cycles, enabling industrial implementation.
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