Acta Chimica Sinica ›› 2008, Vol. 66 ›› Issue (19): 2099-2106. Previous Articles     Next Articles

Original Articles

无粘结剂ZSM-5沸石催化剂骨架脱铝改性的研究

程晓维 汪 靖 郭 娟 龙英才*

  

  1. (复旦大学化学系 上海市分子催化与新材料重点实验室 上海 200433)

  • 收稿日期:2007-11-12 修回日期:2008-04-20 出版日期:2008-10-14 发布日期:2008-10-14
  • 通讯作者: 龙英才

Binder-free ZSM-5 Zeolite Catalysts Modified with Framework De-alumination

CHENG, Xiao-Wei WANG, Jing GUO, Juan LONG, Ying-Cai*   

  1. (Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry,
    Fudan University, Shanghai 200433)
  • Received:2007-11-12 Revised:2008-04-20 Online:2008-10-14 Published:2008-10-14
  • Contact: LONG, Ying-Cai

The adsorption properties of binder-free and binder-containing ZSM-5 zeolite catalysts were compared, and the former one was proved to possess the excellent properties. The binder-free ZSM-5 zeolite catalyst has been treated with HCl solution, steaming, and steaming combined with HCl solution, respectively. The de-alumination behavior and the states of yielded non-framework aluminum on the treated catalysts were studied with 27Al MAS NMR. Some important properties of the treated catalysts, such as the crystalline structures, compositions, pore structures, and distribution of surface strong (S) and weak (W) acidity, Brönsted (B) and Lewis (L) acidity, have been investigated in detail with X-ray diffraction, XRF, N2 adsorption, NH3-TPD and pyridine-adsorption in situ infrared spectroscopy, respectively. The nature of strong tuning effect on the properties of the zeolite framework and surface solid acidity has been revealed for the zeolite catalyst treated with steaming, which plays the key role in tuning the S acidity and B acidity.

Key words: ZSM-5 zeolite, catalyst, binder-free, framework de-alumination, acidity