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New Assignment of the Signals in 23Na DOR NMR to Sodium Sites in Dehydrated NaY Zeolite
The Journal of Physical Chemistry
A new assignment of the signals in the 23Na DOR N M R spectra to the different sodium sites in dehydrated NaY zeolite is presented. 23Na DOR and MAS N M R measurements of dehydrated N a y , Ca2+-exchanged NaY samples, and NaY samples in which M o ( C O )~ is adsorbed are used for this purpose. Four distinct signals in the 23Na DOR N M R spectra of dehydrated NaY are found: the first signal with an isotropic chemical shift of -6 ppm and a quadrupolar coupling constant of 0.4 M H z is assigned todoi:10.1021/j100079a027 fatcat:2bi4blj5znfp3nfm337ppn5g3q