硅沸石完美骨架上的吸附——Ⅰ.乙胺/FAU型沸石相互作用

Adsorption on Siliceous Zeolites with Perfect Framework——Ⅰ. Interaction of Ethylamine/FAU

采用核磁、红外、XRD研究了FAU硅沸石与吸附的乙胺之间的相互作用,XRD谱显示乙胺的吸入导致沸石晶胞收缩、对称性改变,立方变四方.^(29)Si MAS NMR上,FAU硅沸石的单峰分裂成四重峰,同时骨架的红外吸收峰移向低频.这些结果表明,FAU骨架与吸附的乙胺之间存在着强烈的相互作用.

The interaction between the adsorptive ethylamine and siliceous FAU zeolite with perfect framework was investigated using XRD, 29Si 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 peaks on 29 Si 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 AT value of affinity index for ethylamine on the zeolite as well.