The most commonly used adsorbents for drying air are silica gel and molecular sieve. These have proven themselves due to their properties and are used in flow-through bodies or in closed systems, depending on the objective.
In order for the adsorption to be economical, the adsorbent must meet a number of criteria. Among other things, a high useful capacity as well as a high selectivity for certain adsorptives are required. In addition, favourable desorption behaviour and good regenerability must be taken into account when selecting adsorbents. Other important criteria are, for example, high abrasion resistance and good sorption stability.