The results for 𝑟 are displayed together with the directly measured bed temperature 𝑇 in Figure and Figure . The figures are structured by white and grey background into variations (grey) and reference points (white). In Figure and Figure the activity and temperature are shown over the whole campaign for the PFA and the PTFA reactor, respectively. The comparison of the activity between reference I and II as well as between reference III and IV reveals stable catalyst performance during the whole duration of the campaign with marginal changes during variation II at higher pressure. This is in contrast to other recent studies investigating Ru-catalysts in low-temperature CO2 methanation . When comparing both reactors, higher temperatures and CO2 consumption rates were measured in the PTFE reactor, as can be seen when comparing the data at 220 °C in Figure and Figure . A simple estimate using the Arrhenius equation and power-law kinetics shows that the difference in activity is unlikely to be due to the increased temperature alone.