杂原子ZSM－5、ZSM－11和ZSM－48型分子筛的合成

在Na₂O-SiO₂-M_xO_y-H₂O体系中,以HMDA为模板剂用动态法和静态法合成了Ti-ZSM-48型分子筛,首次以85%(wt)HMDA+15%(wt)TPA⁺为模板剂用低温陈化的静态法合成了第四周期过渡金属杂原子M-ZSM-5型分子筛,并与以HMDA、TPA⁺为模板剂合成M-ZSM-5和以TBA⁺为模板剂合成M-ZSM-11进行了对比研究。利用XRD技术跟踪晶体生长过程,考查了模板剂、合成方法、pH值、Na⁺含量等因素对晶化动力学的影响,得出了合成各种杂原子分子筛的最佳条件。各种测试均表明杂原子进入了分子筛骨架。

Synthesis of Heteroatom-Containing Zeolites ZSM-5,ZSM-11 and ZSM-48

By means of pretreatment-grinding gel,Ti-ZSM-48 zeolite was synthesized in the presence of HMDA template under dynamic and static conditions.Several zeolites having ZSM-5 structure and containing the fourth periodic transition metals were synthesized by us ing a mixture of 85% HMDA and 15% TPABr as the template for the first time under static conditions with previous aging at low temperature.A compared investigation of the above synthesis and those of M-ZSM-5 and M-ZSM-11 with HMDA and TPABr as the template re spectively were carried out. XRD analysis at the growing stages of crystals showed that the synthesis methods,pH values and content of sodium ions had great effects on crystallization dynamics,and the optimal synthesis conditions were found.Characterization of the prepared samples indicated that the heteroatoms were located in the zeolite frameworks.