Ejp. Feijen et al., USE OF C-13 CP NMR-SPECTROSCOPY FOR THE QUANTIFICATION OF FAU EMT ZEOLITE INTERGROWTHS SYNTHESIZED WITH 15-CROWN-5 AND 18-CROWN-6 ETHERS/, Journal of physical chemistry, 99(7), 1995, pp. 1837-1839
The C-13 CP NMR envelope of as-synthesized crown ether containing inte
rgrown faujasite polytype zeolites can be used to determine their FAU
and EMT content. The method is calibrated with multiphase Rietveld ref
inement of X-ray patterns that are not broadened too much compared to
those of the phase pure samples.