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利用不同比例的高岭土和硅藻土为原料通过原位晶化方法合成出了结晶度较高的NaY分子筛,采用X射线衍射仪、扫描电子显微镜、N2吸附–脱附等测试手段对合成样品进行了表征。着重考察了m(高岭土):m(硅藻土)(质量比,下同)为6:4和2:8两种比例下,晶化合成体系中n(SiO2):n(Al2O3)(摩尔比,下同)、n(Na2O):n(SiO2)和n(H2O):n(Na2O)对原位晶化产物性能的影响。结果表明:在m(高岭土):m(硅藻土)为6:4的合成体系中,随n(SiO2):n(Al2O3)的增大,NaY分子筛的相对结晶度先增大后减小,增大体系的n(Na2O):n(SiO2)和减小n(H2O):n(Na2O)都有利于产品相对结晶度的提高;在m(高岭土):m(硅藻土)为2:8的合成体系中,增大n(SiO2):n(Al2O3),NaY分子筛的相对结晶度先增大后减小,但增大n(Na2O):n(SiO2)和减小n(H2O):n(Na2O),NaY分子筛的相对结晶度减小。
NaY zeolite with high crystallinity was synthesized by in-situ crystallization using different proportions of kaolin and diatomite as raw materials. The synthesized samples were characterized by X-ray diffraction, scanning electron microscopy and N2 adsorption-desorption Characterization. It is emphatically investigated that the molar ratio of n (SiO2): n (Al2O3) (mols) in the crystallization synthesis system is 6: 4 and 2: 8 for m (kaolin) Than the same below), n (Na2O): n (SiO2) and n (H2O): n (Na2O) on the performance of in situ crystallization products. The results show that the relative crystallinity of NaY zeolite first increases and then decreases with the increase of n (SiO2): n (Al2O3) in the synthesis system of m (kaolin): m (Na2O): n (SiO2) and decreasing n (H2O): n (Na2O) increase the relative crystallinity of the product. In m (kaolin): m : 8, the relative crystallinity of n (SiO2): n (Al2O3) and NaY zeolite increases firstly and then decreases, but the relative crystallinity of n (SiO2): n ): n (Na2O), NaY zeolite relative crystallinity decreases.