Adsorption on siliceous zeolites with perfect framework - I. Interaction of ethylamine/FAU

The interaction between the adsorptive ethylamine and siliceous FAU zeolite with perfect framework was investigated using XRD, Si-29 MAS NMR and FT - IR. As the loading of ethylamine into zeolite, the cell contracts and the s ymmetry transforms from cubic to tetragonal, one peak splits to four peaks on Si-29 MAS NMR spectra, and IR adsorbence of framework shifts to lower fr equency. The observation indicates that there is a strong interaction betwe en adsorptive ethylamine and Si-O framework of FAU zeolite, leading to high A(T) value of affinity index for ethylamine on the zeolite as well.