无导向剂快速合成小晶粒Y分子筛  

Rapid Synthesis of Small Zeolite Y Crystals in the Absence of Seed Gel

作　　者：苑昊[1] 厉刚[1] 

机构地区：[1]浙江大学化学系,浙江杭州310027

出　　处：《石油学报（石油加工）》2012年第6期1006-1011,共6页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(50976103)资助

摘　　要：考察了无有机模板剂、无导向剂条件下合成Y分子筛体系的n(Na2O)/n(SiO2)、n(SiO2)/n(Al2O3)及硅源对Y分子筛结晶过程及其粒径的影响。结果表明,增加n(Na2O)/n(SiO2)有利于促进Y分子筛的形成,但同时也加速Y分子筛的转晶。Y分子筛的粒径随n(Na2O)/n(SiO2)的增加而减小,n(Na2O)/n(SiO2)=0.6和0.88的合成体系在100℃下反应3h后,所得产物的平均粒径分别为0.4和0.3μm,n(Na2O)/n(SiO2)=1.04时形成的小晶粒Y分子筛易发生团聚而形成大颗粒。Y分子筛的n(SiO2)/n(Al2O3)随n(Na2O)/n(SiO2)的增加而减小。n(SiO2)/n(Al2O3)减少时,Y分子筛的粒径分布变宽(0.2～0.7μm)。以硅溶胶或固体纳米SiO2为硅源合成所得Y分子筛的粒径分布较窄(0.3～0.5μm),而以硅酸钠为硅源合成所得Y分子筛的粒径分布较宽(0.2～1.0μm)。Effects of n （Na2 O）/n （Si02）, n （SiO2）/n （A12 O3 ） and Si source on the crystallization process of zeolite Y and its particle size were investigated in the absence of both seed gel and organic templates. The results showed that increase of n（Na20）/n（Si02） in zeolite Y synthesis system not only promoted the formation of zeolite Y crystals, but also facilitated transformation of zeolite Y into other zeolite. The particle size and n（SiO2）/n（A1203） of zeolite Y decreased with the increase of n （Na2 O）/n（Si02 ） in the synthesis system. The average particle sizes of zeolite Y were 0.4 and 0. 3 μm, respectively, under n（Na2O）/n（Si02） of 0.60 and 0.88 and crystallized for 3 h at 100℃. The small crystals already crystallized will aggregate into large ones under n（Na20）/n（Si02） of 1.04. A wide particle size distribution （0.2--0.7 μm） and the decrease of n（SiO2 ）/n（A12Oa ） in zeolite Y were observed with the decrease of n（Na20）/n（Si02）. The particle size distribution of zeolite Y was narrow （0.3-0.5μm） when colloidal silica sol or nanometer silica powder was used as Si source, while a wide particle size distribution （0.2-1.0 μm） was observed when sodium silicate was used as Si source.

关 键 词：Y分子筛 小晶粒 导向剂 快速合成 

分 类 号：O611.4[理学—无机化学]