Abstract
The hydrothermal transformation of Na-clinoptilolite to NaY and NaP 1 zeolites has been studied by Mössbauer spectroscopy of well-characterized solid intermediate phases (XRD, IR, 29Si MAS NMR, and thermodielectric analysis). The evolution of the quadrupole splitting of high spin Fe 3+ during the amorphization and crystallization processes which characterize the hydrothermal transformations indicates that octahedral sites are structure sensitive, while the tetrahedral ones fundamentally depend on the Si Al ratio. Isomer shift values depend on Si Al ratio in both cases.
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