Name : [in Japanese]
Location : [in Japanese]
Date : October 30, 2024 - October 31, 2024
Pages 8-9
CO2 methanation is performed at 300-450°C and atmospheric pressure using Ni supported on CeO2 or ZrO2 as catalysts with moderate basicity. However, the cost of the catalyst is problematic. Therefore, the perovskite-type oxides, BaZr0.95M0.05O3-δ, in which a part of Zr4+ is replaced by M3+ (Y, Fe, Al) and oxygen vacancies were increased, were focused on. In this study, the effect of Ni 10 wt% supported perovskite oxide catalysts on CO2 methanation reaction at 300-450°C was investigated. The highest CH4 yields for Ni/BaZrO3 (400°C), Ni/BaZr0.95Y0.05O3-δ (350°C), Ni/BaZr0.95Fe0.05O3-δ and Ni/BaZr0.95Al0.05O3-δ (400°C) were 65, 75, 72 and 56 mol%, respectively. From the CO2-TPD profiles, CO2 desorption amounts of Ni/BaZr0.95Y0.05O3-δ and Ni/BaZr0.95Fe0.05O3-δ increased more than that of Ni/BaZrO3 between 100‒500°C, whereas Ni/BaZr0.95Al0.05O3-δ decreased 250‒400°C, indicating that the sites with moderate basicity for Ni/BaZr0.95Y0.05O3-δ and Ni/BaZr0.95Fe0.05O3-δ increased by the formation of the oxygen vacancies.
