Abstract
Recent information concerning the kinetics and equilibria of sorption of various classes of molecule in four representative types of molecular sieve (4A/5A, 13X, natural erionite and H-chabazite) is reviewed. The general relationships between the crystal structure of the sieve, the molecular properties of the adsorbate (particularly the critical diameter and polar nature of the molecule) and the sorption/diffusion behaviour are emphasized.

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