沸石分子筛的生成机理与晶体生长(Ⅻ)——非自发成核体系中沸石分子筛的晶体生长模型

The Mechanism of Formation and Crystal Growth of Molecular Sieve Zeolte (Ⅻ)——A Model for Crystal Growth of the Molecular Sieve Zeolite in the System of Non-Spontaneous Nucleation

依据沸石分子筛液相机理,建立了非自发成核体系的晶体生长模型,计算所得27条L型、Ω型和ZSM-5型沸石分子筛晶体生长理论曲线与实验值相符合,确证了该模型的合理性。直到目前为止,关于沸石分子筛晶化动力学的研究几乎都是围绕晶化曲线的形状,建立某种经验公式或理论模型,然后将理论计算结果与实验值相比较。

A model for the crystal growth of molecular sieve zeolite in the system of non-spontaneous nucleation was developed on the basis of the liquid-phase mechanism. 27 curves of crystal growth of L, Ω and ZSM-5 type zeolites were calculated by using the method of computational mathematics. The fact that the calculated curves are consistent with the experimental values shows clearly that the model is of values to explain the process of crystal growth of zeolites, particularly, the stage at the end of crystal growth (the previous other models can not explain experimental curve at this stage). At the same time, some parameters concerned are discussed.