无胺合成[Fe]ZSM-5分子筛的结构鉴定及其催化性能的研究

不用有机胺为模板剂,在碱性介质中采用水热合成法成功地合成了Fe]ZSM-5分子筛.用X射线衍射、透射电镜、红外光谱、顺磁共振谱、X射线光电子能谱和穆斯堡尔谱等对其结构进行了表征,结果表明,Fe原子进入了分子筛骨架,并处于四面体的配位环境.在由甲醇转化为汽油的过程中,以本文合成的Fe]ZSM-5与用有机胺为模板剂合成的Fe]ZSM-5分子筛为催化剂相比,其活性和选择性几乎相同,且都比通常的HAl]ZSM-5好,C₅组分以上的选择性大于80%,且芳烃(包括脂环烃)和异构烃的含量达75%以上.

Identification of Structure and Investigation of Catalytic Properties on [Fe]ZSM-5 Zeolite Synthesized Without Amines

Fe]ZSM-5 Zeolite was synthesized successfully in a alkaline medium by the hydrothermal crystallization method without amines as the templates.The structure of Fe]ZSM-5 zeolite was identified by means of XRD,TEM,IR,EPR,XPS and Mossbauer spectroscopies.It was proved that the structure of product is a typical ZSM-5 type and Fe3+ ions were introduced into the ZSM-5 framework and were in the lattice of zeolite with a tetrahedral environment.In the conversion reaction from methanol to gasoline he catalytic activity and selectivity of HFe]ZSM-5 zeolite synthesized without amines are the same as those of HFe]ZSM-5 zeolite synthesized with amine and are much better than those of HAl]ZSM-5 zeolite.The selectivity for C5+ products is over 80% and the components of aromatic hydrocarbons and isoalkanes in Ct products are over 75%.