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A series of CeO2 supported Cu, Co, and Ni catalysts have been synthesized by the wetimpregnation method for CO2 thermo-catalytic hydrogenation from 200 -400 °C in the fixed bed reactor. All catalysts were characterized by XRD, N2-isotherms, and H2 temperature-programmed reduction. XRD results have suggested that the incorporated Cu, Co, and Ni have uniformly distributed on the CeO2 surface, N2-isotherm analysis confirmed that the pores of CeO2 were blocked by incorporated metals and H2-TPR indicated strong interaction between active metal and CeO2. The CO2 consumption rate and product selectivity depend on the type of active metal on CeO2 and reaction temperature. The order of CO2 consumption rate for 5wt% catalysts was 5Ni/CeO2 > 5Co/CeO2 > 5Cu/CeO2 at 400 °C. The high CO2 consumption rate for 5Ni/CeO2 was attributed to the presence of more number of active metallic Ni during the reaction which dissociated H2 molecule to H-atoms. The formed H-atoms reacted with active CO2 molecule and formed CH4 with 100% selectivity.

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This work investigates the effect of the Potassium promoter and the calcination temperature on the catalytic activity in the dry reforming of methane reaction and compares the performance of the Ni, Co, Fe-Al 2 O 3 trimetallic catalysts with the reference Ni-Al 2 O 3 . Although higher activity was achieved with the Ni-Al 2 O 3 , trimetallic catalysts resulted in a more favorable CO/H 2 ratio and considerably better coke resistance. Higher calcination temperature led to the increase in coke formation which caused the sintering of the catalysts. Promoting samples with 0.5%K in order to improve the coke formation resistance, reduced the catalytic activity.