The simulation results are analysed for the time on temperature TOT and time on stream TOS being apparent in the reaction system. The basic idea (see sec. Finally, the mixed deactivation exhibits a complex difference between PTK and steady-state experiment. We can see from the simulation study that the thermal deactivation seems to be more prominent at the beginning. However, the slope of deactivation during PTK is smaller for higher TOS, which can be explained by the reactivation occurring under periodic absence of component A.