(569gb) CO2 methanation over Ni-7%Mo/AC catalyst

As a result of the significant increase in greenhouse gas emissions, technologies for the capture, utilization and storage of carbon dioxide are being implemented. Carbon dioxide (CO₂) methanation has attracted considerable interest among potential carbon utilization strategies due to its ability to generate energy from non-fossil resources by using captured CO₂. However, due to the extremely limited kinetics of CO₂ methanation, the use of a catalyst is required to achieve the desired reaction efficiency. Due to their high availability and activity, nickel-based catalysts have become increasingly popular in recent years to catalyse the CO₂ methanation process. The use of nickel-based catalysts requires a high activation energy of 92 kJ/mol for the reaction to proceed. This study investigated the effect of temperature over Ni-7%Mo/AC in the temperature range of 200 - 450 °C for CH₄ production. The catalyst was synthesised using the incipient wetness impregnation method. The findings indicate that the maximum CO₂ conversion and CH₄ yield were achieved at a temperature of 350 °C with a total GHSV of 12000 h⁻¹, and H₂:CO₂ ratio of 4:1 under atmospheric pressure. Therefore, the results demonstrate the potential of Ni-7%Mo/AC for CO₂ methanation at low temperatures and atmospheric pressure.

Keywords: CO₂, methanation, CO₂ conversion, nickel.