Counterdiffusion of Liquid Hydrocarbon Pairs in Ion-Exchanged Forms of Zeolite X

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Abstract
Adsorptive counterdiffusion rates of liquid benzene, ethyl benzene, 1,3,5-trimethyl benzene, and 1-methyl naphthalene into Na+, K+, Cs+, and Ca2+ ion exchanged forms of zeolite X saturated with cyclohexane were measured. The diffusivity of the adsorbing hydrocarbon decreases as the effective pore size of the zeolite is decreased by ion exchange. The effective pore size in CaX and CsX was so small as not to allow the adsorptive counterdiffusion of 1,3,5-trimethyl benzene and 1-methyl naphthalene. Diffusion took place only after the cations in the pore mouths were displaced to other cation sites in the structure under the influence of the adsorbing hydrocarbon molecules, and thus the rate of counterdiffusion appeared to increase with time.