Due to the different bed configurations applied, the evaluation of the experimental data needs to be adjusted for each of the configurations. The applied calculations for the molar flow rate of NH3 at the reactor outlet 𝑛̇ , are summarized in Table . A detailed description of the evaluation method is given in the supplementary information (Eq. S1 to Eq. S12). For experiments using catalyst and inert SiC only (bed configuration a)), the extent of sorption was assumed to be zero (Eq.( )). Accordingly, the measured molar flow rate of NH3 at the reactor outlet of bed configuration (a) is calculated as given in Eq. ( ) based on the measured molar fraction 𝑦 , . Bed configurations using catalyst and sorbent in a two-bed configuration (bed configuration b) and c)) were used to measure the sorbed amount of NH3 under varying reaction conditions. Due to the consecutive arrangement of catalyst and sorbent, the synthesis reaction in the catalyst was not affected by the sorption. Hence, the NH3 synthesis rate is assumed identical for configurations a), b) and c). Accordingly, the extent of sorption for the experiments was calculated by Eq. ( ), using the measured molar flow rate of configuration a) under equal reaction conditions. The respective molar flow rate 𝑛̇ , , was calculated using Eq. ( ). The sorbed amount of NH3 𝑛 , , was calculated by integration of the extent of sorption over a certain time interval Δ𝑡, as shown in Eq. ( ). The time interval was defined as follows based on experimentally accessible information: