分子筛酸中心与NMR

ACIDIC CENTER OF ZEOLITE AND NMR

通过沸石分子筛的固体高分辨核磁共振观测，可以确定骨架硅、铝比，分析硅、铝在骨架上的统计分布特征。基于化学位移或核电四极作用的表征，可识别、分辨铝在沸石中不同结构状态或配位状态；这些微观信息，有助于认识沸石酸性机理，以及对有关其合成、改性的种种研究提供重要依据。

he high resolution solid -state NMR is able to determine the framework Si/Al ra-tio and to analyze the statistical distribution characters of Si, Al atom in the frameworkof zeolite samples. Based on characterizations of the chemical shift and quadrupoleinteraction the various aluminum species presented in zeolites can be identified or classi-fied. The inicroscopic information is helpful to the understanding of acidity mecha-nisms and provides important basis for researches of the synthesis and the modificationof zeolites.