A simulated annealing study of cation distribution in dehydrated Na-exchanged faujasite zeolites

摘要

A simulated annealing method is employed to study the cation distribution in dehydrated Na- exchanged faujasite zeolites. By use of the same three parameter, i.e. E_I'-E_I, e-II-eI, the site energy level differences between the cations on the different cation sites I, I' and II, and w, the repulsive energy between cation pairs located on adjacent sites I and I', the cation distribution in dehydrated NaHY-type zeolites (with a Si/Al ratio of 2.46) with varying cation loading or temperatures could be accurately predicted.