Haldor Topsøe A/S
Gas cleaning where specific substances are removed down to a very low level is required in many catalytic processes either to avoid deactivation of catalysts or for environmental reasons. One example is ammonia synthesis where all oxygen-containing molecules have to be removed from the synthesis gas since the ammonia synthesis catalyst otherwise will be severely poisoned. Another example is production of chemicals like e.g. methanol from synthesis gas obtained from gasification of coal or biomass; here thorough cleaning of the gas from a lot of substances like heavy metals, S, Cl, and NH3 is required.
The technologies usually used for gas cleaning are scrubbing with liquids or absorption by solids. The presentation will review the possibility to use similar technologies for full or partly removal of water and CO2 from air to be used in Li-air batteries. By simple assumptions it is evaluated how different methods and process designs will influence the energy densities of the Li-air battery on the system level.