“…Under atmosphere pressure, it is much easier to convert CO2 into methane when operating the system. The chemical equation and enthalpy change is written as [16] (20) In the system, the yield of fuel is modeled by reaction kinetics. Refer to the experiment data from Miguel et al [17], reaction kinetic equation of CO2 methanation over Ni-based catalysts at 473-673 K, is written as…”