Here, the initial deactivation rate for the longer interval with 240 s is less pronounced (smaller slope) compared to the 120 s period. Therefore, it can be presumed that the coke formation may not be the key process, but the formation of reactive carbon deposits, which are hydrogenated during the CO free half-period. Thus, the deactivation for the longer period duration of 240 s is less pronounced at the beginning, since the period for reactivation of the catalyst is longer. For increasing TOS the deactivation rate of all three cases become similar and the feedback between deactivation rate and current activity makes the interpretation more complex. Interestingly, a dynamic operation may prevent the chemical deactivation at least partly. Hence, further experimental investigations are necessary to prove the suggested deactivation mechanism and develop strategies to prevent deactivation.