以EU-1分子筛为晶种合成ZSM-11分子筛及其表征

摘要

以EU-1分子筛为异质晶种,采用不同模板剂和硅源合成两种不同粒度尺寸的ZSM-11分子筛.采用XRD,FT-IR,SEM,N2吸附-脱附等手段对合成的ZSM-11分子筛样品进行表征.结果表明,当晶种加入量(w)为1％～10％时,一定温度下水热晶化处理1～10天,均可以得到结晶度高、无杂晶的ZSM-11分子筛.采用不同方法合成的两种ZSM-11分子筛在形貌、晶粒尺寸及硅铝比上存在较明显区别,微米尺寸的ZSM-11分子筛呈椭球状,由许多板条状粒子团聚而成,尺寸约为200 nm× 700 nm,硅铝比较高；纳米尺寸的ZSM-11分子筛为清晰的球状晶体,是由许多球状纳米级粒子团聚形成的,粒径在100 nm以下,硅铝比较低.%With zeolite EU-1 as heterogenous crystal seed,two ZSM-11 zeolite samples having different crystal sizes were synthesized by using different synthesis methods, templates and silicon sources.The prepared ZSM-11 samples were characterized by XRD,FT-IR,SEM,N2 adsorption-desorp-tion and so on.The influence of the adding amount of heterogenous crystal seed was studied.Results showed that zeolite ZSM-11 with high crystallinity could be obtained when using 1%-10% heterogenous crystal seed and crystallization under a certain temperature for 1-10 days.The characterization results showed that the morphologies and crystal size of ZSM-11 samples synthesized by different methods were varied:one exhibited as spherical nanometer crystals with particle size under 100 nm,and another was elliptic globosity micron crystals(200 nm×700 nm)having large mesoporous structure, which was agglomerated by panel particles.Furthermore,the SiO2/Al2O3 ratios of these two samples varied significantly as well,the nanometer sample was lower and the micron one was higher.