Isovalent Doping Effect on Pd Exsolution in Perovskite-type Oxide for CO₂ Methanation

The increase of carbon dioxide (CO₂) in the global atmosphere is a critical problem that accelerates global warming through the greenhouse effect, and a solution is needed to reduce carbon dioxide. Among the various carbon reduction technologies, CO₂ methanation can contribute to reducing CO₂ emissions by chemical reactions with hydrogen (H₂), and synthetic methane (CH₄) gas obtained by the reaction can be stored and transported through an advanced natural gas infrastructure. However, it is necessary to develop catalysts with high catalytic activity and durability in order to maintain methane production for a long time. Exsolution process in which metal ions doped in the perovskite lattice escape from the lattice and become nanoparticles on the surface is a synthetic technique that has been reported to ensure catalyst durability by strong bonding with supports and metal ions.<br/>In this study, we aim to apply the isovalent doping effect in perovskite-type oxide to promote the exsolution of Palladium (Pd), which is known as a representative active catalyst for CO₂ methanation reaction. We evaluated the catalytic activity and durability of Pd exsolved SrTiO₃ catalysts by Ba doping in Sr sites against CO₂ methanation .