Hence, current research evaluates the potential of ruthenium (Ru) based catalysts, which promise high activity at low reaction temperatures . Previously we performed a detailed kinetic study comparing an iron (Fe) with a Ru based catalyst under mild reaction conditions, in order to identify promising catalysts for the aimed process intensification and to derive appropriate kinetic models . The major findings are as follows: A strong inhibition by H2 was observed for the Ru catalyst, which limits the catalytic activity, especially at low temperatures. As this inhibition remains unaffected during in situ removal of NH3, Ru appears disadvantageous for the sorption-enhanced NH3 synthesis. In contrast, the Fe catalyst was kinetically unaffected by H2 but inhibited by NH3 while reaching higher reaction rates at low temperature. Hence, even kinetic acceleration becomes possible for Fe catalysts by in situ removal of NH3. Consequently, the choice of the catalyst potentially affects the gain in yield applying a sorption-enhanced process concept.