高等学校化学学报 ›› 1989, Vol. 10 ›› Issue (7): 729.

• 研究论文 • 上一篇    下一篇

脱铝八面沸石的催化行为——非晶格铝的影响

矫庆泽, 蒋大振, 范曙光, 曹建华   

  1. 吉林大学化学系
  • 收稿日期:1987-09-14 出版日期:1989-07-24 发布日期:1989-07-24
  • 通讯作者: 蒋大振

Catalytic Characterization of the Dealuminized Faujusite ——Effect of the Nonframework Aluminiun

Jiao Qingzhe, Jiang Dazhen, Fan Shuguang, Cao Jianhua   

  1. Department of Chemistry, Jilin University, Changchun
  • Received:1987-09-14 Online:1989-07-24 Published:1989-07-24

摘要: 经水热处理和SiCl4处理得到了两个系列的脱铝Y沸石USY(W)和USY(T).经X射线衍射分析、化学分析和ESCA研究确定USY(W)中包含有非晶格铝.通过TPD、IR研究发现,沸石中非晶格铝屏蔽了沸石中的强酸中心,同时产生部分弱酸中心。经异丙苯裂化反应和DTA实验发现非晶格铝的存在虽使反应活性降低,但却提高了抗积碳能力。

关键词: 脱铝八面沸石, 非骨架铝, 表面酸性, 催化活性

Abstract: By hydrothermal treatment or silicon tetrachloride reaction at a high temperature, we have succeeded in reducing the content of Al atom in zeolite HYand obtained two series of deafuminized Yzeolite named as USY(W) containing nonframework Al and USY(T).USY(W) and USY(T) were characterized by TPD.IRand ESCA.The results shows that the nonframework Al in the USY (W) screens the strong acid sites of the surface and produces weak acid sites.The effects of Si/Al ratio and nonframework Al on the cumene- cracking activity of dealuminated zeolite were examined.The results shows that the higher the Si/Al is, the smaller the catalytic activity is.Besides, the nonframework Al in the USY(W) exerts a influence on the catalytic activity of zeolite in cumene-cracking and coking.The catalytic activity of zeolite decreases with the formation of non-framework Al and the coking amount reduces obviously.

Key words: Dealuminized faujastite, Nonframcvvork aluminium, Surface acidity.Catalytic activity

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