We found that mass transfer and adsorption kinetics are critical within the design space of aminefunctionalised adsorbents and can be optimised via adsorbent and contactor design. Meanwhile, the heat transfer to the adsorbent also has a significant impact and should be improved through better adsorbent thermal conductivity, alternative contactor designs, or different heating methods. The maximum CO2 capacity of the adsorbent does not have a large impact on performance within the range studied, and neither do the heat effects of the heat of adsorption. However, high heats of adsorption are preferable