Choji FukuharaAsuka KamiyamaMikito ItohNozomu HirataSakhon RatchahatMasao SudohRyo WatanabeNational University Corporation Shizuoka UniversityMahidol UniversityAmano Institute of Technology2020-03-262020-03-262020-06-29Chemical Engineering Science. Vol.219, (2020)000925092-s2.0-85081022744https://repository.li.mahidol.ac.th/handle/20.500.14594/53626© 2020 Elsevier Ltd 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.Mahidol UniversityChemical EngineeringChemistryEngineeringArticleSCOPUS10.1016/j.ces.2020.115589