AM-6分子筛的快速合成及原子线形成机理研究

摘要

A rapid synthesis(4 h) method of AM-6 zeolite was reported. The effects of the n(K+ )/n(V4+) ratio and the pH value of the initial gel on the purity and crystallinity of AM-6 zeolite were investigated. The synthesis conditions optimize at n ( K + )/n ( V4+ ) = 3 and pH = 12.5. The formation mechanism of the V—O—V— atomic wires in AM-6 was monitored by UV Raman spectroscopy in combination with UV-Vis spectroscopy and X-ray diffraction patterns. It turns out that the formation of the VO3- chains composed of cornet-sharing VO4 in the silicate gel plays an important role in the formation of—V—O—V— atomic wires in AM-6 crystals.%报道了一种4 h快速合成AM-6分子筛的方法,考察了凝胶中K+含量和起始凝胶碱度对AM-6分子筛纯度以及晶化度的影响.结果表明,向合成体系中引入适量K+可以抑制杂相的生成,在n(K+)/n(V4+)=3和pH=12.5条件下,制备的样品为纯相且晶化度最高.结合紫外-可见吸收光谱和紫外拉曼光谱研究了AM-6分子筛的形成过程.结果表明,在合成初期形成了由VO4四面体共角相连的VO-3的链状结构,该结构是形成AM-6分子筛中-V-O-V-原子线的重要中间物种.