关键词: ZSM-35分子筛, 晶粒尺寸, 晶体形貌

Abstract:

ZSM-35 zeolites were synthesized by hydrothermal synthesis method using ethylenediamine (EDA)、cyclohexane(CHA) and pyrrolidine(THP) as organic templates separately. The crystal structure, morphology, and pore structure of ZSM-35 prepared were characterized by X-ray diffraction, scanning electron microscope, and N2 adsorption isotherms. The influence factors during synthesis, such as basicity, crystallization temperature, crystallization time and template types were investigated. The results show that the stronger basic conditions are needed for ZSM-35 zeolite synthesis. At the crystallization temperature of 170℃, the ZSM-35 zeolites possess higher relative crystallinity. Extending the crystallization time is beneficial to the growth of crystals. The template type has an important influence on the morphology and particle size of ZSM-35 zeolite. Under the same preparation conditions, the smallest particle of the ZSM-35 zeolite can be obtained using pyrrolidine as a template. When ethylenediamine and cyclohexane are used together, the small sheet and dispersive crystals are received.

Key words: ZSM-35 zeolite, particle size, crystal morphology