Carbon dioxide (CO 2 ) in sour natural gas can be removed using green technology via catalytic methanation reaction by converting CO 2 to methane (CH 4 ) gas. Using waste to wealth concept, production of CH 4 would increase as well as creating environmental friendly approach for the purification of natural gas. In this research, a series of alumina supported manganese-nickel oxide based catalysts doped with noble metals such as ruthenium and palladium were prepared by wetness impregnation method. The prepared catalysts were run catalytic screening process using inhouse built micro reactor coupled with Fourier Transform Infra Red (FTIR) spectroscopy to study the percentage CO 2 conversion and CH 4 formation analyzed by GC. Ru/Mn/Ni(5:35:60)/Al 2 O 3 calcined at 1000°C was found to be the potential catalyst which gave 99.74% of CO 2 conversion and 72.36% of CH 4 formation at 400°C reaction temperature. XRD diffractogram illustrated that the supported catalyst was in polycrystalline with some amorphous state at 1000°C calcination temperature with the presence of NiO as active site. According to FESEM micrographs, both fresh and used catalysts displayed spherical shape with small particle sizes in agglomerated and aggregated mixture. Nitrogen Adsorption analysis revealed that both catalysts were in mesoporous structures with BET surface area in the range of 46-60 m 2 /g. All the impurities have been removed at 1000°C calcination temperature as presented by FTIR, TGA-DTA and EDX data. ª 2013 Production and hosting by Elsevier B.V. on behalf of King Saud University.

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