The interaction between the adsorptive ethylamine and siliceous FAU zeolite with perfect framework was investigated using XRD, ^2^9Si MAS NMR and FT-IR. As the loading of ethylamine into zeolite, the cell contracts and the symmetry transforms from cubic to tetragonal, one peak splits to four peks on ^2^9Si MAS NMR spectra, and IR adsorbence of framework shifts to lower frequency. The observation indicates that there is a strong interaction between 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.

Key words: SILICON, ZEOLITE, ETHYLAMINE, INTERACTIONS, NMR SPECTROMETRY, INFRARED SPECTROPHOTOMETRY