Using in-situ techniques to probe high-temperature reactions: Thermochemical cycles for the production of synthetic fuels from CO2 and water

摘要: Ferrites are promising materials for enabling solar-thermochemical cycles. Such cycles utilize solarthermal energy to reduce the metal oxide, which is then re-oxidized by H2O or CO2, producing H2 CO, respectively. Mixing ferrites with zirconia yttria-stabilized (YSZ) greatly improves their cyclabilities. In order understand this system, we have studied behavior of iron oxide/ 8YSZ (8 mol-% Y2O3 in ZrO2) using situ X-ray diffraction and thermogravimetric analyses at temperatures up 1500 °C under controlled atmosphere. The solubility oxide measured XRD room temperature was 9.4 Fe. increased least 10.4 Fe when heated between 800 1000 inert Furthermore found migrate out phase as oxidation state changed. samples containing >9.4 Fe, stepwise heating 1400 helium caused reduction Fe2O3 Fe3O4 FeO. Exposure FeO-containing material CO2 1100 FeO evolution CO. Thermogravimetric analysis during thermochemical cycling a range contents showed that mostly dissolved utilized greater proportion atoms present than did possessing fraction un-dissolved oxides. © International Centre Diffraction Data [doi:10.1017/S0885715612000255]