The reactor was charged with 2 g of the catalyst diluted with 4 g of quartz sand. The catalyst bed length was 5 cm. Hence, the pressure drop was considered to be negligible. The measurements were carried out at atmospheric pressure using mixtures of CO, CO2, H2, H2O, and N2. First, the influence of each gas on the reaction rates was examined. Both for CO and for CO2 methanation, a kinetic expression based on a Langmuir–Hinshelwood approach turned out to be suitable. The temperature was then varied from 160–190 ◦C for CO and 190–235 ◦C for CO2. Initially, the residence time was small to keep conversion of CO and CO2 low (