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.
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