As the temperature is raised in consecutive experiments, the capacity of the first cycle in each experiment differs due to the desorption of further NH3. This effect further explains that all cycles at 300 °C are similar, as the pretreatment was carried out at the same temperature. The dependence of the sorbent capacity of the regeneration procedure is commonly described in the literature investigating similar sorbents . The total capacity is usually categorized into an irreversible and a reversible fraction. In the first cycle, the sum of both fractions is measured, while during repeated cycles only the reversible capacity is determined . Hence, the further discussion of results refers to the second cycle of experiments to ensure comparability of the results. Figure further shows the measured molar fraction, 𝑦 , during the total sorption phase of the respective cycle. This molar fraction represents the NH3 that is not removed from the gas stream through sorption and is consequently referred to as NH3 slip. In this, two related trends can be observed. Firstly, the slip generally increases for all cycles with increasing temperatures, indicating the shift of the NH3 sorption equilibrium as expected for the exothermic sorption. Secondly, the slip is lower for the first cycle and increases for the second and third cycle, following the trend of the measured capacities. This shows that the loss of the irreversible sorption capacity after the first cycle also causes an increase in NH3 slip through the sorbent bed.