Methane is classified as one of the most dangerous air pollutant with a warming potential over 20 times higher than that of CO₂. Then, methane abatement trough catalytic oxidation processes, especially using low-cost, noble-metal-free catalysts, falls in line with the most important challenges of environmental catalysis. Therefore, a series of MnCeO_x composite materials, with different compositions (0.10 < χ_Ce<0.75), have been prepared via, a facile, eco-friendly redox-precipitation route and their catalytic performance on methane total oxidation reaction were evaluated from 200 °C to 700 °C, at a space velocity of 30,000 h⁻¹. A significant improvement of activity was observed by increasing the fraction of CeO₂ in the catalytic compositions. An almost complete methane conversion (already at 600 °C) and characteristic T₅₀ value of 475 °C were recorded with the most active catalyst (i.e. Mn-to-Ce ratio of 1:3). Bulk and surface characterization techniques provide evidence of strong synergism between the different oxide phases, favouring Mn ions dispersion at quasi-molecular level, through the incorporation of Mn²⁺ ions into ceria lattice, enhancing surface area and redox functionality too. The superior catalytic performance of the MnCeO_x composite catalysts, especially at high χ_Ce, is therefore associated with enhanced textural properties, along with the presence of highly dispersed manganese species and structural defects on the surface, leading to an improved “oxygen mobility” and low-temperature reducibility.

甲烷被归类为最危险的空气污染物之一，其变暖潜力比 CO ₂高 20 多倍。然后，通过催化氧化过程减少甲烷，特别是使用低成本、不含贵金属的催化剂，符合环境催化最重要的挑战。因此，一系列MnCeO的_X复合材料，具有不同组成（0.10 <χ_铈<0.75），已经制备通过，一个轻便，生态友好的氧化还原-沉淀路线以及它们对甲烷总氧化反应催化性能，从200评价°C 至 700 °C，空速为 30,000 h ^-1. 通过增加催化组合物中CeO ₂的比例，观察到活性的显着提高。几乎完全的甲烷转化（已经在 600 °C 下）和475 °C 的特征 T ₅₀值被记录到使用最活跃的催化剂（即 Mn 与 Ce 的比例为 1:3）。本体和表面表征技术提供了不同氧化物相之间强协同作用的证据，通过将 Mn ²⁺离子结合到氧化铈晶格中，也增加了表面积和氧化还原功能，从而有利于 Mn 离子在准分子水平上的分散。MnCeO _x复合催化剂的优异催化性能，尤其是在高 χ _Ce，因此与增强的质地特性有关，以及表面上存在高度分散的锰物种和结构缺陷，从而导致“氧迁移率”和低温还原性的改善。