摘要
采用乳液聚合法制备单分散的聚合物(聚苯乙烯)微球,将Y沸石晶种溶液填充到聚合物微球的间隙中,成功合成粒径和形貌可控的小晶粒Y沸石。采用DLS表征聚合物的粒径,XRD、N_2吸附和SEM表征结果表明,合成的样品为纳米到亚微米级Y沸石。主要原因:(1)聚合物之间的间隙可限制晶体的生长;(2)Y沸石晶种溶液的引入可以缩短诱导期,增加单位体积的晶核数量。给出了修正后的聚合物间隙的物理模型,通过改变物理模型中的可变参数,可控制合成出所需系列粒径的小晶粒沸石分子筛。
Monodisperse polystyrene microspheres were prepared by emulsion polymerization. Uniform small crystal size zeolite Y with size and appearance control were firstly synthesized by filling confined voids formed by polymer spheres with crystal seed solution of zeolite Y. DLS was used to characterize grain size of polymer mierospheres. The characterization results of XRD, N2 adsorption-desorption isotherms and SEM indicated that the size of as-synthesized Y zeolite could controlled from nanometer to hypomicron. The main reasons were as follows：the first one was the confined growth of zeolite crystals in the voids of polymer microspheres;the second one was to shorten induction period and increase the number of crystal nuclei in unit volume due to the introduction of crystal seed solution of zeolite Y. The model of confined voids for polymer mierospheres was modified. The zeolites with controlled crystal size ,which were expected, were synthesized by adjusting alterable parameters in the model.
出处
《工业催化》
CAS
2011年第6期47-50,共4页
Industrial Catalysis
关键词
催化剂工程
小晶粒Y沸石
晶种溶液
聚合物微球
catalyst engineering
small crystal size zeolite
crystal seed solution
polymer microspheres
