Location and movement on dehydration of Cu2+in Cs7Na5A zeolite from electron spin echo modulation analysis

摘要

It is shown that paramagnetic ions like Cu2+can be located and that their motion upon dehydration in zeolites can be monitored by electron spin echo modulation analysis. In Cs7Na5A zeolite, Cu2+is located inside the bgr; cage about 0.1 nm below a hexagonal window between the bgr; and agr; cages. The Cu2+is coordinated to three lattice oxygens and one water molecule. On dehydration Cu2+moves out of the bgr; cage along the threefold axis of the hexagonal window to about 0.1 nm above the hexagonal window into the agr; cage.