Perovskite oxides have been considered as appropriate alternatives to precious metal catalysts in CH₄ combustion due to their excellent activity and sintering-resistance capacity. Herein, an innovative plasma-induced strategy was employed to the one-step preparation of porous LaMnO₃ (LMO-P) and cerium-substituted LaMnO₃ (LCMO-P) perovskite oxides with enhanced lattice distortion. The increased specific surface area provided numerous active sites for surface diffusion, and formational lattice distortion introduced more active oxygen species. Exceptionally, the defect-enriched porous LMO-P and LCMO-P catalysts displayed supreme low temperature CH₄ oxidation activities, giving T₉₀ of 475 °C and 440 °C at a space velocity of 30 000 mL g⁻¹ h⁻¹, respectively. The excellent catalytic activities of plasma-induced perovskite catalysts might be associated with high reactivity of oxygen adspecies as well as preferable reducibility. This study will provide a novel and universal strategy for the synthesis of composite oxide catalysts with rich surface defects.

中文翻译：

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用于催化甲烷燃烧的缺陷富集钙钛矿氧化物的等离子体诱导构建

钙钛矿氧化物因其优异的活性和抗烧结能力而被认为是 CH ₄燃烧中贵金属催化剂的合适替代品。在此，采用创新的等离子体诱导策略一步制备多孔 LaMnO ₃ (LMO-P) 和铈取代的 LaMnO ₃ (LCMO-P) 钙钛矿氧化物，具有增强的晶格畸变。增加的比表面积为表面扩散提供了许多活性位点，并且晶格畸变引入了更多的活性氧物种。异常地，富含缺陷的多孔 LMO-P 和 LCMO-P 催化剂表现出极高的低温 CH ₄氧化活性，使T ₉₀在 30 000 mL g ^-1 h ^{-1 的}空速下分别为 475 °C 和 440 °C 。等离子体诱导钙钛矿催化剂的优异催化活性可能与氧物质的高反应性以及较好的还原性有关。该研究将为合成具有丰富表面缺陷的复合氧化物催化剂提供一种新颖且通用的策略。