The kinetic parameters, summarized in table 2, are determined in our previous work for hydrogenation of CO/CO2 mixtures using 5 wt.-% Ni/Al2O3 catalyst with a pellet size of 175 µm . Hence, these parameters are already validated for the case of small catalyst pellets discussed in the simulation scenarios below. The equilibrium constant of the CO2 methanation 𝐾 eq is calculated via the Gibbs free energy of reaction assuming the isobaric heat capacity being temperature invariant in accordance to and data from .