Effect of Partial Noble Metal (M = Pd, Rh, Ru, Pt) Substitution in La1−xSrxCo1−yMyO3 Perovskite-Derived Catalysts for Dry Reforming of Methane

This study examines the surface chemistry of platinum, palladium, rhodium, and ruthenium-substituted lanthanum strontium cobaltate perovskite catalysts in the context of the dry reforming of methane (DRM). The catalysts were synthesized by the solution combustion method and characterized by using a series of techniques. To explore the effect of noble metal ion substitution on the DRM, surface reaction was probed by CH<inf>4</inf>/CO<inf>2</inf> TPSR using mass spectroscopy. It was recognized that La<inf>1−x</inf>Sr<inf>x</inf>Co<inf>1−y</inf>Pd<inf>y</inf>O<inf>3</inf> show the best activities for the reaction in terms of the temperature but became deactivated over time. CH<inf>4</inf>/CO<inf>2</inf> temperature-programmed surface reactions (TPSRs) were set up to unravel the details of the surface phenomena responsible for the deactivation of the DRM activity on the LSPdCO. The CH<inf>4</inf>/CO<inf>2</inf> TPSR analysis conclusively demonstrated the importance of lattice oxygen in the removal of carbon, which is responsible for the stability of the catalysts on the synthesized perovskites upon noble metal ion substitution.