Recent initiatives like CCS aim to reduce CO2 emissions by collecting and storing carbon dioxide. Thermochemical processes, utilizing concentrated solar power, enable recycling captured CO2 into fuel at temperatures exceeding 1000 °C. In the case of utilizing ceria (CeO2) and iron aluminate (FeAl2O4) as reactants, experiments with ceria covered a wide range of reaction temperatures, and experiments with spinel as an alternative reactant were conducted. And a system analysis of solar carbon dioxide thermochemical splitting was also conducted. The analysis assumed a scenario where heat recovery between solid materials was not carried out, and heat recovery was solely achieved from exhaust gases. By keeping the reduction reaction temperature constant at 1400 ℃ while varying the oxidation reaction temperature, the energy conversion efficiency from solar energy to fuel was calculated. The results indicated that when exhaust gas heat recovery was considered, using iron aluminate led to a higher energy conversion efficiency compared to using ceria.