高等学校化学学报

高等学校化学学报 ›› 1990, Vol. 11 ›› Issue (11): 1180.

• 研究论文 • 上一篇    下一篇

沸石分子筛的骨架同晶置换(Ⅰ)——NH4BF4溶液中沸石分子筛的脱铝补硅

刘新生, 徐如人, 丁红, 张艳秋, 刘子阳   

  1. 吉林大学化学系, 130023
  • 收稿日期:1989-05-25 出版日期:1990-11-24 发布日期:1990-11-24
  • 通讯作者: 刘新生
  • 基金资助:

    国家自然科学基金

Isomorphous Substitution of Zeolitic Framework (Ⅱ)—— Dealumination and Silicon Insertion for Zeolites in an Aqueous Solution of NH4BF4

Liu Xinsheng, Xu Ruren, Ding Hong, Zhang Yanqiu, Liu Ziyang   

  1. Department of Chemistry, Jilin University, Changchun, 130023
  • Received:1989-05-25 Online:1990-11-24 Published:1990-11-24

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摘要： 通过NH4BF4溶液对沸石分子筛进行脱铝补硅,对所得产物已用多种技术表征。结果表明,在此处理过程中,产物的硅铝比随溶液中NH4BF4浓度的增加而增加,热稳定性随之增强,酸量随之减弱,未发现硼对骨架元素的同晶置换,而发生了脱铝补硅作用。

关键词: NH4BF4, 脱铝补硅, 热稳定性, 酸性

Abstract: Dealumination and silicon insertion of zeolites (Y, ZSM-5 and Beta) in an aqueous solution of NH4BF4 were investigated. The products were characterized by using various techniques such as XRD, IR, NMR, TPDand XRF. It is demonstrated that dealumination and silicon insertion occur definitely during this treatment. The Si/Al ratio is increased and the acidity is decreased with increasing the concentration of NH4BF4 used. In this process substitution of B for the framework elements does not occur and the process is proven to be a useful method for monitoring the Si and Al siting in the zeolites.

Key words: NH4BF4, Dealumination-silicon insertion, Thermal stability, Acidity

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