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分子筛骨架铝及非骨架铝的定量测定对于分子筛酸中心机理研究以及指导和监测分子筛改性工艺均有重要意义。众所周知,化学和X—Ray分析方法定量确定分子筛骨架和非骨架铝量比率有困难。目前多以NMR方法为主,综合化学及其它手段来获得有关信息:即对经脱铝热处理后的分子筛样,藉~(29)Si MAS NMR方法测定骨架硅铝比,而由化学分析方法确定铝
The quantitative determination of molecular sieve framework aluminum and non-framework aluminum is of great significance for the study of the molecular mechanism of molecular sieve acid and the guidance and monitoring of molecular sieve modification process. It is well-known that chemical and X-ray analysis methods have difficulty in quantitatively determining the ratio of the molecular sieve framework to the non-framework aluminum. So far, most of the methods are based on NMR methods, comprehensive chemistry and other methods to obtain the relevant information: the Si / Al ratio of the framework is determined by the ~ (29) Si MAS NMR method after the dealumination heat treatment of molecular sieve samples, and the chemical analysis method is used to determine aluminum