To eliminate the aggregation of Co₃O₄ in the methane combustion process at high temperature, a thermally stable mullite structure, SmMn₂O₅ (SMO), was utilized as a support to improve the catalytic durability of Co₃O₄ particles. In detail, Co/SMO composite catalysts were prepared using the deposition–precipitation method with distinct Co/SMO nominal weight ratios of 5%, 30% and 50%. Later, their methane combustion performances under an oxygen-rich atmosphere were evaluated and compared. Meanwhile, their physical and chemical properties were characterized by XRD, Raman spectroscopy, the BET method, SEM, HRTEM, XPS, H₂-TPR and O₂-TPD. H₂-TPR and O₂-TPD results illustrated that the Co/SMO-50% catalyst showed the highest reducibility and it enhanced the mobility of oxygen species. As a result, the Co/SMO-50% sample exhibited the highest CH₄ combustion catalytic activity among all the composite catalysts. Specifically, the T₁₀, T₅₀, and T₉₀ for methane combustion were measured to be 334 °C, 390 °C, and 437 °C, very similar to those of Co₃O₄ catalyst. At the same time, the Co/SMO-50% catalyst showed improved durability, better performance after recycling, thermal aging and long-term experiments when compared to the Co₃O₄ catalyst.

中文翻译：

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负载在SmMn ₂ O ₅上 的Co ₃ O ₄颗粒提高了甲烷燃烧的耐久性†

为了消除高温下甲烷燃烧过程中Co ₃ O ₄的聚集，将热稳定的莫来石结构SmMn ₂ O ₅（SMO）用作载体，以提高Co ₃ O ₄颗粒的催化耐久性。详细地，使用沉积沉淀法制备了Co / SMO复合催化剂，Co / SMO的标称重量比分别为5％，30％和50％。随后，评估并比较了它们在富氧气氛下的甲烷燃烧性能。同时，通过X射线衍射，拉曼光谱，BET法，SEM，HRTEM，XPS，H ₂ -TPR和O ₂对它们的理化性质进行了表征。-TPD。H ₂ -TPR和O ₂ -TPD结果表明，Co / SMO-50％催化剂具有最高的还原性，并提高了氧的迁移率。结果，在所有复合催化剂中，Co / SMO-50％样品表现出最高的CH ₄燃烧催化活性。具体地说，测得的用于甲烷燃烧的T ₁₀，T ₅₀和T ₉₀分别为334°C，390°C和437°C，与Co ₃ O ₄催化剂非常相似。同时，与Co相比，Co / SMO-50％催化剂显示出更高的耐用性，再循环，热老化和长期实验后的更好性能。₃ O ₄催化剂。