微量Al对杂原子ZSM-5型沸石晶化的影响

The Influence of Trace Amounts of Aluminium on the Crystallization of Heteroatom-Containing ZSM-5-Type Zeolites

在HMDA-Na_(2)O-MO_(x/2)-SiO_(2)-H_(2)O体系中(HMDA=1,6-己二胺,M=V(Ⅲ),V(Ⅳ),Fe(Ⅲ)和Ga),通过加Al对照实验、液相电子衍射结构分析、X射线光电子能谱(XPS)表面组成分析和晶化动力学计算等方法,考察了微量Al对杂原子ZSM-5型沸石形成与晶体生长的影响。结果表明,微量Al对这类沸石的形成起"助成核作用",从而加速其晶体生长。

The present paper reports the systematical investigation of the influence of trace amounts of aluminium on the formation and crystal growth of M-Si-ZSM-5 type zeolites(M=B,Ga,Ti,V,Cr and Fe).It is shown that a trace of aluminium plays"nucleation-assisting"role in the formation of heteroatom-containing ZSM-5 type zeolites and accelerates the crystal growth of these zeolites by means of the comparison experiments of adding Al to the system of HMDA-Na_(2)O-MO_(x/2)-SiO_(2)-H_(2)O,electron diffraction,XPSand the calculation of the crystallization kinetic model.