Thermally Reconstructed Ru/La-CoO Nanosheets with Super Thermal Stability for Catalytic Combustion of Light Hydrocarbons: Induced Surface LaRuO Active Phase

Addressing the thermal deactivation of catalysts remains critical for light hydrocarbons (LHs) combustion. This study develops Ru/La-CoO nanosheets combining RuO and La-doped CoO, demonstrating exceptional high-temperature stability. The individual introduction of Ru or La significantly promoted the catalytic activity of CoO, but a severe thermal deactivation is still inevitable. Remarkably, the co-decoration of Ru and La brought a prominent resistance to high-temperature, the aged Ru/La-CoO at 750 °C for 4 h presented a better activity than the fresh catalyst and the T instead decreased by 11 °C, even only increased by 1 °C after aging 100 h and 15 °C for 200 h. Systematic studies revealed that the co-presence of La and Ru enhanced the resistance to sintering of CoO and promoted the migration of the lattice oxygen, moreover, the high-temperature induced the formation of LaRuO perovskite through the reaction of RuO with the exsolved La from CoO. LaRuO phase with excellent redox ability and thermal stability presented a superior activity for catalytic combustion of LHs and suppressed the leaching of Ru species in an oxidizing atmosphere at high temperature. This work contributed to the design of catalysts especially Ru based catalysts for the stable elimination of LHs emissions under high temperature conditions.