Figure shows the results for the measured NH3 outlet molar flow rate for bed configurations a) and c) at 80 bar and 350 °C. The in situ sorption experiment exhibits the different phases proposed by Wein et al. as discussed. While both bed configurations in principle show the expected behavior according to Figure , a deviation from the ideal behavior is observed for the saturation phase, where both experiments do not reach the exact same NH3 outlet molar flow rates. This can be explained by differences in catalyst bed preparation and activation in both bed configurations. The measured NH3 outlet molar flow rates for bed configurations a) and c) for all reaction conditions shown in Table can be found in the supplementary information (Figures and). Experiments were carried out at different temperatures and pressures to investigate the sorption under varying reaction conditions. The measured extents of the NH3 sorption 𝜉 ̇ are shown in Figure for pressures of 45 bar (solid lines) and 80 bar (dashed lines). The maximum extent of sorption was observed at 400 °C and 80 bar. Under these conditions the highest NH3 productivity of the Fe catalyst can be achieved, which facilitates NH3 sorption due to the higher driving force. For lower temperatures the peak maximum for the extent of sorption lowers, while the duration of the sorption phase was prolonged. The latter effect is presumably caused by the increased sorption capacity at lower temperatures. Pressure reduction from 80 to 45 bar led to a decreased extent of sorption, as the related reduction of the NH3 partial pressure reduces the driving force for the sorption.