基于双模板剂B-EU-1/ZSM-5复合分子筛的合成与表征

Synthesis and characterization of B-EU-1/ZSM-5 composite molecular sieves based on dual template

首次在Na2O-SiO2-Al2O3-TPABr(四丙基溴化铵)-HMBr2(溴化六甲双铵)-H2O合成体系中,以溴化六甲双铵(HMBr2)和四丙基溴化铵(TPABr)为双模板剂,采用一步晶化法合成了具有微-微孔道结构的B-EU-1/ZSM-5复合分子筛,并通过XRD,FT-IR,SEM等手段对合成样品的物性进行表征;分析发现合成的复合分子筛同时具有ZSM-5和EU-1的特征衍射峰,结晶度较好,是两种晶相相互作用的分子分散晶相材料;通过合成条件的探究,发现复合分子筛的生长过程与两种模板剂的比例有关,在0.2<n(四丙基溴化铵)/n(溴化六甲双铵)<0.5的范围内是复合分子筛适宜的生长环境,得到合成的最佳条件为:n(四丙基溴化铵)/n(溴化六甲双铵)=0.4,晶化时间72h。

The B-EU-1/ZSM-5composite molecular sieve with porous structure was synthesized using hexamethonium bromide（HMBr2）and four propyl bromide（TPABr）as co-templates by one-step hydrothermal synthesis method in Na2O-SiO2-Al2O3-TPABr-HMBr2-H2 O synthesis system for the first time.The properties of synthetic samples were characterized by the XRD,FT-IR and SEM,finding that the composite molecular sieve was dispersed crystal phase material which had diffraction peaks of ZSM-5and EU-1at same time,and had better crystallinity.Exploring the synthesis conditions,found the growth process of the molecular sieve was in connection with the proportion of two templates.Composite molecular sieve would be suitable for the growth in a range of 0.2〈n（TPABr）/n（HMBr2）〈0.5.The best synthesis conditions was n（TPABr）/n（HMBr2）=0.4and reaction time 72 h.