高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (6): 943.

• 论文 • 上一篇    下一篇

酸处理对β沸石结构和酸性的影响

沈剑平1, 李悦1, 孙铁1, 郭军1, 张波1, 蒋大振1   

  1. 1. 吉林大学化学系, 长春, 130023;
    2. 北京石油化学科学研究院;
    3. 克山师范专科学校
  • 收稿日期:1994-08-24 修回日期:1995-02-04 出版日期:1995-06-24 发布日期:1995-06-24
  • 通讯作者: 沈剑平,男,26岁,博士研究生.
  • 作者简介:沈剑平,男,26岁,博士研究生.
  • 基金资助:

    石油化学工业总公司基金

Effect of Acid Treatment on the Structure and Acidity of Beta Zeolite

SHEN Jian-Ping1, LI Yue1, SUN Tie1, GUO Jun1, ZHANG Bo1, JIANG Da-Zhen1   

  1. 1. Department of Chemistry, Jilin University, Changchun, 130023;
    2. Research Institute of Petroleum Processing, Beijing;
    3. Keshan Normal College, Keshan
  • Received:1994-08-24 Revised:1995-02-04 Online:1995-06-24 Published:1995-06-24

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摘要： 考察了酸处理对β沸石的结构和酸性的影响;发现β沸石的骨架虽易脱铝,但能抗5mol/LHCl,在5mol/LHCl中,β沸石的脱铝程度可达80.0%以上.β沸石中四方晶系的耐酸性比单斜晶系差,故可通过酸处理调节β沸石的手性.吸附表明,酸处理对β沸石的孔容影响不大.NH3-TPD及Py-IR结果表明,β沸石经酸处理后,其酸强度增加,在Si/Al=38.8样品上达到最强,表面酸以L酸为主,且随Si/Al比的增加而增强.

关键词: &beta, 沸石, 酸处理, 多晶稳定性, 孔径和酸性

Abstract: The effect of acid treatment on the structure and acidity of β zeolite was investigated. It was found that βzeoliteis easily dealuminated by acid treatment,but it can resist 5 mol/L HCl solution.The degree of dealumination is higher than 80% in the 5 mol/L HCl solution.In the acid solution the stability of polymorph(A)is less than that of(B).The chiral of βzeolite can be modified by acid treatment.The results of adsorption, NH3-TPD and pyridine-IR show that the pore volume does not change obviously,the acid strength of sample changes with acid treatment and reaches its maximum in the sample with the Si/Al of 38.8.Lacid is the main acid sites on the surface and increases with increasing the value of Si/Al ratio.

Key words: β-Zeolite, Acid treatment, Polymorph stability, Pore and acidity

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