Elucidation of Active Species over Ru/MnO Catalyst on Co 2 /H 2 Methanation Reaction

Abstract

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/Al 2 O 3 catalysts calcined at 400˚C, 700˚C, 900˚C, 1000˚C and 1100˚C, Ru/Mn-65/Al 2 O 3 and Ru/Mn-85/Al 2 O 3 catalyst calcined at 1000˚C were synthesized by the wetness impregna-tion 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/Al 2 O 3 calcined at 1000˚C showed the highest 60.21% CO 2 conversion with 57.84% formation of CH 4 at the reaction temperature 200˚C. The expected active species that assist the CO 2 methanation activity over this catalyst was Mn 3 O 4 .