合成条件对ZSM-35分子筛结构和形貌的影响

分别以乙二胺、环己胺和吡咯烷为模板剂，采用静态水热晶化法合成ZSM-35分子筛。通过XRD、SEM、低温N2吸脱附手段对分子筛的晶体结构、形貌和孔结构进行表征，对加料顺序、碱度、晶化温度和时间以及模板剂种类等影响分子筛合成的因素进行考察。结果表明：ZSM-35分子筛需在较强的碱性条件下合成，晶化温度为170 ℃时得到的分子筛样品结晶度较好，晶化时间适当延长有利于晶体的生长；模板剂种类对分子筛的形貌和粒径有较大影响，采用吡咯烷作模板剂在相同条件下得到的分子筛粒径最小，同时采用乙二胺和环己胺作模板剂时，得到了片状且分散较好的小粒径晶体。

EFFECT OF SYNTHESIS CONDITIONS ON STRUCTURE AND MORPHOLOGY OF ZSM-35 ZEOLITE

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.