Abstract
AbstractDealuminated Y zeolites (DAY) were obtained by steaming of NH4NaY at temperatures between 450 °C and 700 °C. They were characterised by means of 27Al and 29Si MAS NMR, IR spectroscopic and XRD measurements. The Si/Al framework ratios of samples were calculated using the 29Si MAS NMR signal intensities, the wave numbers of the double‐ring vibration band wDR and the asymmetrical TOT valence vibration wTOT of IR spectra as well as the XRD lattice constant a0. In contrast to actual Si/Al ratio obtained from wDR and a0, the NMR spectroscopic and wTOT values were determined to be too high because of the superposition of the signals coming from dealuminated zeolite framework and silica gel which forms in the zeolite as a result of steaming. The differently determined Si/Al ratios characterise the siliceous extra‐framework species.
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