Zeolite molecular sieve The adsorption of has two characteristics:
(1) The Lewis center on the surface has strong polarity;
(2) The size of cage or channel in zeolite is very small, which makes the gravitational field in it very strong. Therefore, its adsorption capacity for adsorbate molecules is far greater than other types of adsorbents. Even if the partial pressure (or concentration) of adsorbate is very low, the adsorption capacity is still considerable. The adsorption and separation effect of zeolite molecular sieve is not only related to the size and shape of adsorbate molecules, but also related to its polarity. Therefore, zeolite molecular sieve can also be used for the separation of substances with similar size.