Pr_3N-ZSM-5分子筛的合成与表征

Synthesis and Characterization of Pr_3N-ZSM-5 Molecular Sieve

硅铝酸盐分子筛的合成一般采用水热晶化法,反应混台物的pH值大于10,并且体系中含有金属离子,分子筛原粉必须通过铵离子交换和焙烧才能转变为氢型催化剂,1986年,Guth等人曾在非碱性介质含氟体系中,在加晶种条件下以三丙胺为模板剂得到ZSM-5分子筛,文献报道的ZMS-5分子筛大单晶的合成均采用四丙基铵离子作模板剂,尚未见到用其它有机分子作为模板剂合成ZMS-5大单晶的报道,我们在非碱性介质含氟体系中以三丙胺直接合成出ZSM-5分子筛,并得到了大单晶。用多种实验技术对三丙胺在ZSM-5分子筛中的存在状态进行了表征。

The ZSM-5 and its larger single crystals were crystallized hydrothermally from Pr3N-SiO2-AS2O3-H2O-HF (Pr3N=tripropylamine) system.The scanning electron microscopy and electron probe microanalysis show that the morphology of ZSM-5 crystals was influenced by A! contents and the crystal nuclei were first produced from the gel enriched in silicon.Tripropylamine molecules in the protonated from are occuluded in the chanels.The numbers of organic template molecules per unit cell are 4.15.