Abstract
Intracrystalline self-diffusion of water and short-chain-length paraffins in zeolite ZK-4, NaA, and NaCaA as determined by the n.m.r. pulsed-field gradient technique are compared. While the paraffin diffusivities in zeolite ZK-4 and NaCaA are found to be of the same order, and by at least four orders of magnitude above the values for NaA, the water self-diffusion coefficients are found to decrease in the sequence ZK-4 > NaA > NaCaA. These experimental results may be explained on the basis of the different rate-controlling mechanisms for intracrystalline diffusion.
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