In this study, a series of BaO-MnO_x mixed oxide catalysts were synthesized by the mechanochemical method and employed in lean methane catalytic combustion (MCC) at low temperatures. The synthesized catalysts were characterized by XRD, BET, TGA, FT-IR, H₂-TPR, O₂-TPD, and FESEM analyses. The results indicated that the 10 wt% BaO-MnO_x catalyst with a BET surface area of 25 m² g⁻¹ possessed the best catalytic performance. The higher activity of the 10 wt% BaO-MnO_x catalyst was due to the higher ability to supply oxygen through the components during the MCC process. The light-off temperature corresponding to 50% of the methane conversion was about 330 °C, which was about 50 °C lower than the pure MnO_x. Moreover, for the BaO(10)-MnO_x catalyst, the 10 and 90% of methane conversion temperatures were about 305 and 427 °C, respectively. Also, the 10 wt% BaO-MnO_x catalyst exhibited high catalytic stability under dry feed condition at 450 °C for 50 h. Furthermore, the influence of various parameters such as calcination temperature, feed ratio, GHSV, pretreatment condition, and presence of water vapor in the feedstock was studied on the catalytic performance.

在这项研究中，通过机械化学方法合成了一系列BaO-MnO _x混合氧化物催化剂，并将其用于低温下的稀甲烷催化燃烧（MCC）。通过XRD，BET，TGA，FT-IR，H ₂ -TPR，O ₂ -TPD和FESEM分析对合成的催化剂进行了表征。结果表明，BET表面积为25m ²  g ^-1的10wt％的BaO-MnO _x催化剂具有最佳的催化性能。10 wt％BaO-MnO _x的较高活性之所以使用这种催化剂，是因为在MCC工艺过程中，通过组分提供氧气的能力更高。对应于甲烷转化率50％的起燃温度约为330°C，比纯MnO _x低约50°C 。此外，对于BaO（10）-MnO _x催化剂，甲烷的10％和90％的甲烷转化温度分别约为305和427°C。同样，10 wt％的BaO-MnO _x催化剂在干进料条件下于450°C下保持50 h表现出高催化稳定性。此外，研究了煅烧温度，进料比，GHSV，预处理条件和原料中水蒸气的存在等各种参数对催化性能的影响。