Experimental investigation of La0.6Sr0.4FeO3- pellets as oxygen carriers in a counter-current packed-bed reactor for efficient chemical looping CO2 splitting

The application of chemical looping for reverse water gas-shift provides an efficient way for the conversion of CO 2 to CO, enabling the transformation of captured CO 2 into value-added products. For example, by using the produced CO along with renewable H 2 to synthesise liquid fuels. In this study, we applied the concept of a chemical ‘memory’ reactor, employing a perovskite-based oxygen carrier (La 0.6 Sr 0.4 FeO 3- δ , LSF) in a counter-current packed-bed reactor for CO 2 splitting. This approach overcomes the chemical equilibrium limitation and could produce high purity CO. Our work experimentally investigated the performance of LSF pellets as oxygen carriers in a large lab-scale packed-bed reactor with gas switching technology for chemical looping CO 2 splitting. We evaluated the effects of changes in feed time, bed temperatures, and flow rates on CO 2 to CO conversion. Optimal conditions gave over 90 % CO 2 to CO conversion via counter-current flow, compared to 45 % for conventional co-current flow in the same reactor. Higher bed temperatures enhanced the CO 2 to CO conversion. • La 0.6 Sr 0.4 FeO 3- δ pellets were investigated in a reverse-flow chemical looping reactor for CO 2 splitting. • Nearly complete CO 2 to CO conversion can be achieved without thermodynamic limitations. • Effects of changing in bed temperature, feed time, and flow rates on CO 2 conversion have been evaluated. • La 0.6 Sr 0.4 FeO 3- δ pellets exhibits stable performance over CO 2 splitting tests.