摘要
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.
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 VO-3 chains composed of corner-sharing VO4 in the silicate gel plays an important role in the formation of —V—O—V— atomic wires in AM-6 crystals.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第3期721-725,共5页
Chemical Journal of Chinese Universities
基金
国家“九七三”计划项目(批准号:2009CB623507)
国家自然科学基金(批准号:20773118,21003122)资助
