Ni-based Catalyst Development for the Catalytic Conversion of CO2 to Substitute Natural Gas-Effect of Preparation Method

Substitute Natural Gas (SNG) is receiving discernible attention as a fuel for the next generations because of the growing energy demand, and fossil fuels are depleting. On the other hand, CO2 emissions are already increasing, so catalytic conversion of CO2 to SNG is a promising way to reduce atmospheric CO2. However, CO2 conversion is not so easy because of its stable properties. So, there is a need for a suitable catalyst that can solve problems such as CO2 conversion, CH4 yield, catalyst deactivation and related issues. Here, we report the effect of the catalyst preparation method and the effect of precipitating agents on the problems mentioned earlier. The 5 series of Al2O3-supported Ni-based and Ni-Fe bimetallic catalysts are prepared by impregnation and coprecipitation methods and characterized by H-2-TPR, XRD, H-2-TPD, and CO2-TPD, NH3-TPD techniques. The reactions are carried out with TPSR by using a pulse injection technique, which showed a range of CH4 formation and CO2 conversion with a CO2:H-2 ratio of 1:4. The 15(Ni-Fe)/Al2O3 showed almost 2 times better conversion and 1.5 times yield at a lower temperature (300 degrees C) compared to the other prepared catalysts. These findings are promising and suggest that Ni-Fe catalysts prepared by coprecipitation method are favoured for SNG production and could lead to more efficient and cost-effective process development. [GRAPHICS] .