Elucidation of Active Species over Ru/MnO Catalyst on Co2/H2 Methanation Reaction

摘要

The information regarding phase changes and structure transformation, particle sizes as well as active species of the catalyst are briefly discussed towards alumina supported Ru/MnO catalysts according to their various parameters of calcination temperatures and Mn loading. The Ru/Mn-75/Al2O3 catalysts calcined at 400°C, 700°C, 900°C, 1000°C and 1100°C, Ru/Mn-65/Al2O3 and Ru/Mn-85/Al2O3 catalyst calcined at 1000°C were synthesized by the wetness impregnation method. All the prepared catalysts exhibited crystallite size in the range of 95 nm to 114 nm. It was found that the catalyst with Ru/Mn-75/Al2O3 calcined at 1000°C showed the highest 60.21% CO2 conversion with 57.84% formation of CH4 at the reaction temperature 200°C. The expected active species that assist the CO2 methanation activity over this catalyst was Mn3O4.