Experimental investigation of La0.6Sr0.4FeO3- pellets as oxygen carriers in a counter-current packed-bed reactor for efficient chemical looping CO2 splitting
Yongliang Yan, Reinaldo Juan Lee Pereira, Matteo Fella, Zuoan Li, Wenting Hu, Yngve Larring, Ian S. Metcalfe
Abstract
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.