Abstract
Self-diffusion parameters of zinc into zeolites X and Y, of Si:Al atios of 1·26, 1·87 and 2·62 respectively, have been determined at low and high temperatures. Derived values of E A and ΔS‡ have been rationalized in terms of mechanisms in which water played an important part, and a possible explanation for anomalous results obtained with X at low temperatures has been put forward.
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