The Sunshine to Petrol project at Sandia aims to utilize concentrated solar energy to convert carbon dioxide and water to syn gas precursors for liquid hydrocarbon fuels. Solar thermochemical CO 2-splitting is possible utilizing redox-active metal oxides: MO x → MO x-y + y/2 O 2 (>1300°C) MO x-y + yCO 2→ MO x + yCO (<1200°C) M can be, but is not limited to, Fe, Co, Ni, or Ce. Ferrite-based oxides require a support, e.g. yttria-stabilized zirconia, to be repeatedly redox-active. Ceria-based materials do not require a support but present different challenges, including high reduction temperatures and low Ce utilization. A systematic study of these oxides is underway to better elucidate microstructure, structure-property relationships, and transport behavior under high-temperature reducing and oxidizing environments. The design of in-situ experiments to investigate the chemistry under operating conditions has been a main focus. The results of these experiments and how they relate to material performance will be presented.
ASJC Scopus subject areas
- Chemical Engineering(all)