The methanation experiments were conducted at 280 °C and a pressure of 2 bar with a stoichiometric ratio of H2:COx of 4:1. The volumetric flow rates at standard conditions of the different components were adjusted to 100 mL min -1 H2, 25 mL min -1 CO2 or CO, 20 mL min -1 Ar (internal standard) and 105 mL min -1 He (dilution) for the carbon containing gas line and 100 mL min -1 H2 and 150 mL min -1 He for the carbon-free gas line, resulting in a total volumetric flow rate of 250 mL min -1 through the reactor. We compared the deactivation of a 12 h long steady-state methanation run with that during the dynamic PTK experiment with the same TOS under syngas. Hence, the representative PTK experiment took 24 h and consists of 360 periods of 240 s, each, in order to mimic the steady-state operation for 12 h. The outlet molar flow rates of each carbon-containing half-period were used for evaluation in the pseudosteady-state. In order to reduce noise, we averaged the composition measured for 10 s in this region.