In this paper, 20 wt%NiO–Al₂O₃ catalysts promoted by various promoters (iron, cobalt, manganese, and chromium oxides) were synthesized using the facile mechanochemical method, and their performance in the process of carbon dioxide methanation was investigated. The physicochemical features of the catalysts were examined by the XRD, BET, TPR, and FESEM analyses. The results showed that the catalyst promoted by manganese oxide has the best performance among the nickel-based catalysts due to the more adsorption of carbon dioxide and higher reducibility. The synthesized 20 wt%NiO-15 wt%Mn₂O₃–Al₂O₃ sample with a BET area of 258.79 m²/g showed 85.36% carbon dioxide conversion and 99.3% methane selectivity at 350 °C. According to the obtained results, the catalyst calcined at 500 °C showed the highest efficiency in this process. Furthermore, the 20 wt%NiO-15 wt%Mn₂O₃–Al₂O₃ catalyst showed high stability during 12 h of the reaction time.

在本文中，使用简便的机械化学方法合成了由各种助催化剂（铁、钴、锰和铬氧化物）促进的20 wt% NiO–Al ₂ O ₃催化剂，并研究了它们在二氧化碳甲烷化过程中的性能。通过XRD、BET、TPR和FESEM分析检测了催化剂的物理化学特征。结果表明，氧化锰促进的催化剂由于对二氧化碳的吸附更多，还原性更高，因此在镍基催化剂中性能最好。合成的 20 wt% NiO-15 wt%Mn ₂ O ₃ –Al ₂ O ₃样品，BET 面积为 258.79 m ²/g 在 350 °C 下显示 85.36% 的二氧化碳转化率和 99.3% 的甲烷选择性。根据所得结果，在该过程中，在 500 °C 下煅烧的催化剂显示出最高的效率。此外，20 wt% NiO-15 wt%Mn ₂ O ₃ –Al ₂ O ₃催化剂在12小时的反应时间内表现出高稳定性。