Synthesis and characterization of ferrite materials for thermochemical CO2 splitting using concentrated solar energy

FUEL 53

Andrea Ambrosini, aambros@sandia.gov, Fuels and Energy Transitions, Sandia National Laboratories, PO Box 5800, MS 0734, Albuquerque, NM 87185-0734, Eric N. Coker, encoker@sandia.gov, Chemical Synthesis and Nanomaterials, Sandia National Laboratories, PO Box 5800, MS 1349, Albuquerque, NM 87185, Mark Rodriguez, Materials Characterization, Sandia National Laboratories, PO Box 5800, MS1411, Albuquerque, NM 87185, Stephanie Livers, Solar Technologies, Sandia National Laboratories, PO Box 5800, MS1127, Albuquerque, NM 87185-1127, and James E. Miller, jemille@sandia.gov, Ceramic Processing and Inorganic Materials, Sandia National Laboratories, 1001 University Blvd, Albuquerque, NM 87106.

The Sunshine to Petrol effort at Sandia aims to convert carbon dioxide and water to precursors for liquid hydrocarbon fuels using concentrated solar power. Significant advances have been made in the field of solar thermochemical CO2-splitting technologies utilizing yttria-stabilized zirconia (YSZ)-supported ferrite composites. Such materials work via the basic redox reactions:

Fe3O4→ 3FeO + 0.5O2                                  (Thermal reduction, >1350˚C)

3FeO + CO2→ Fe3O4 + CO                          (CO2-splitting oxidation, <1200˚C)

There has been little fundamental characterization of the ferrite-based materials at the high temperatures and conditions present in these cycles. A systematic study of these composites is underway in an effort to begin to elucidate microstructure, structure-property relationships, and the role of the support on redox behavior under high-temperature reducing and oxidizing environments. In this presentation the synthesis, structural characterization (including scanning electron microscopy and room temperature and in-situ x-ray diffraction), and thermogravimetric analysis of YSZ-supported ferrites will be discussed.