Self-diffusion parameters for copper(II) ions in three synthetic faujasite zeolites with Si:Al ratios of 1.26, 1.87 or 2.62 were determined for two temperature ranges (table 51). The deduced values were used to predict the ion sites which were involved in the diffusion processes.

The Mobility of Cations in Synthetic Zeolites with the Faujasite Framework - VII: The Mobility of Copper in X and Y Zeolites. A.Dyer, S.A.I.Barri: Journal of Inorganic and Nuclear Chemistry, 1977, 39[6], 1061–3