SOLAR THERMOCHEMICAL CO2 SPLITTING OVER La0.6Sr0.4MnO3 PEROVSKITES

The effect of Fe and Mn content in mixed perovskites (La0.6Sr0.4Mn1-xFexO3-?) on the performance of solar thermochemical CO2 splitting is studied. Catalyst were tested by thermogravimetric analysis (TGA) and activity tests in a lab-scale reactor. On increasing the Fe content the temperature at which reduction is activated decreases. Conversely, the oxidation step is favored by high Mn content. Results show that for optimizing both reduction and oxidation step bi-functional systems with two active sites are needed. One site should enhance the self-reduction activity, the other should enhance the oxidation reaction.