Addressing the thermal deactivation of catalysts remains critical for light hydrocarbons (LHs) combustion. This study develops Ru/La-Co3O4 nanosheets combining RuOx and La-doped Co3O4, demonstrating exceptional high-temperature stability. The individual introduction of Ru or La significantly promoted the catalytic activity of Co3O4, 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-Co3O4 at 750 °C for 4 h presented a better activity than the fresh catalyst and the TC3-90 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 Co3O4 and promoted the migration of the lattice oxygen, moreover, the high-temperature induced the formation of LaRuO3 perovskite through the reaction of RuOx with the exsolved La from Co3O4. LaRuO3 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.
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