Abstract
Electronic spectra of Ni cations in X-zeolite were investigated. In hydrated zeolite, Ni cations are in the form of octahedral hexa-aquo complex. Upon dehydration, the coordination environment of Ni cations deviates from the octahedral one. Ammonia coordinates to Ni cations at room temperature when NiX is pretreated at 200 °C, but it does not coordinate to Ni cations even at 200 °C when NiX is evacuated at 500 °C. This indicates that Ni cations in S 1 sites do not migrate to the supercage below 200 °C. Adsorption of pyridine at 200 °C induces the migration of the cation from S 1 sites to the supercage.
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