Using concentrated solar energy as the source of high-temperature process heat, a two-step CO₂ splitting thermochemical cycle based on Zn/ZnO redox reactions is applied to produce renewable fuels. The solar thermochemical cycle consists of (1) the solar endothermic dissociation of ZnO to Zn and O₂; (2) the non-solar exothermic reduction of CO₂ with Zn to CO and ZnO; the latter is recycled to the 1st solar step. The second step of the cycle is experimentally investigated in a hot-wall quartz aerosol flow reactor, designed for quenching of Zn(g), formation of Zn nanoparticles, and in-situ oxidation with CO₂. The effects of varying the reactants stoichiometry, reaction temperatures, and inlet flow temperatures for radial and annular flows were investigated. Chemical conversions of Zn to ZnO of up to 88% were obtained for a residence time of 3s. For all of the experiments, the reactions primarily occurred heterogeneously on the reaction zone surfaces, outside the aerosol jet flow.