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沸石晶内的扩散行为与其孔结构有密切关系,本文用不同的处理方法,制备了不同硅铝比和相对结晶度的改性Y型沸石,研究了它们的孔结构和用容量法测定扩散系数间的关系。Y型沸石的脱铝率增高,相对结晶度下降,使沸石晶内的孔结构发生变化。次级孔增加,微孔减少,晶粒的当量直径也减小,这对扩散性能的改善十分有利。低次级孔率时,扩散系数随次级孔量的增加而近似呈线性上升,说明在有次级孔的情况下,沸石晶内的扩散系数的大小不仅与孔道尺寸有关,也与次级孔量有密切的关系。
The diffusion behavior in the zeolite is closely related to its pore structure. In this paper, different Y-type zeolites with different Si / Al ratios and relative crystallinity were prepared by different treatment methods. Their pore structures were studied and the diffusion coefficient Relationship between. Y-type zeolite off-rate increased, the relative decline in crystallinity, zeolite crystal structure of the pore structure changes. The secondary pores increase, micropores decrease, and the equivalent diameter of the grains also decreases, which is very beneficial to the improvement of diffusion properties. In the case of low secondary porosity, the diffusion coefficient increases approximately linearly with the increase of the secondary pore volume, indicating that in the case of secondary pores, the size of the diffusion coefficient in the zeolite is not only related to the pore size but also to the secondary There is a close relationship between the amount of holes.