Abstract The CO2 methanation for transition-metal catalysts loaded on various oxide-supports was investigated under feeding with a raw material gas containing oxygen. The co-feeding of the oxygen greatly improved methanation performance for Ni- and Ru-based catalysts, because of the high thermal energy generated from hydrogen–oxygen combustion. Especially, Ni/CeO2, Ni/ZrO2, Ni/Y2O3, and Ni/Al2O3 catalysts and the prepared ruthenium catalysts demonstrated high activity and high methane-selectivity even in a region at room temperature and atmospheric pressure. The auto-methanation (AM) phenomenon, which is reported in the world for the first time, proceeded over these catalysts. Compared to that of the Ni-based catalyst, the AM activity of the Ru-based catalyst was approximately 10% higher. Although it was generally predicted that the produced methane was combusted by the co-fed oxygen, yet such methane combustion was not observed so as that the minimum ignition energy of methane–oxygen is much larger than that of hydrogen–oxygen.

中文翻译：

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负载在各种氧化物载体上的过渡金属催化剂的自动甲烷化：室温和大气压下 CO2 转化的新途径

摘要 研究了负载在各种氧化物载体上的过渡金属催化剂在含氧原料气进料下的 CO2 甲烷化。由于氢-氧燃烧产生的高热能，氧气的共同进料大大提高了镍基和钌基催化剂的甲烷化性能。尤其是Ni/CeO2、Ni/ZrO2、Ni/Y2O3和Ni/Al2O3催化剂和制备的钌催化剂，即使在室温和大气压的区域内也表现出高活性和高甲烷选择性。世界上首次报道的自甲烷化（AM）现象就是在这些催化剂上进行的。与Ni基催化剂相比，Ru基催化剂的AM活性高出约10%。