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Acta Chimica Sinica ›› 2009, Vol. 67 ›› Issue (18): 2067-2073. Previous Articles     Next Articles

Original Articles

天然CXN沸石分子筛水热稳定性研究 II. 水蒸汽处理温度对铵型沸石物化性质的影响

何秋平a 程晓维b 鄢 浩*,a 龙英才*,b   

  1. (a上海大学环境与化学工程学院化工系 上海 201800)
    (b复旦大学化学系 上海市分子催化与功能材料重点实验室 上海 200433)
  • 投稿日期:2008-11-27 修回日期:2009-01-04 发布日期:2009-12-31
  • 通讯作者: 龙英才

Hydrothermal Stability of Natural CXN Zeolite II. Influence of Steaming Temperature on the Properties of NH4-Type Zeolite

He, Qiupinga Cheng, Xiaoweib Yan, Hao*,a Long, Yingcai*,b   

  1. (a Department of Chemical Engineering, School of Environment and Chemical Engineering,
    Shanghai University, Shanghai 201800)
    (b Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry,
    Fudan University, Shanghai 200433)
  • Received:2008-11-27 Revised:2009-01-04 Published:2009-12-31
  • Contact: Long, Yingcai

Cited

4

Based on the investigation of factors influencing the hydrothermal stability of natural Stilbite (CXN) zeolite, the relationship between the steaming temperature and coordinations of Al and Si in the framework of NH4-CXN zeolite has been investigated in detail by 27Al & 29Si MAS NMR characterizations, which indicate that both the framework SiO2/Al2O3 ratios and Si(OH) contents of the zeolite increase with the steaming temperature rising, and 21.3 of the framework SiO2/Al2O3 ratio for the zeolite was obtained by steam treatment at 750 ℃ for 3 h. NH3-TPD shows that the total acid amount of the zeolite decreases with the steaming temperature rising. Nitrogen adsorption data prove that non-framework aluminum obviously blocks part of the zeolite channels and some mesopores appear at the same time.

Key words: CXN zeolite, STI zeolite, steam treatment, non-framework aluminum, acidity, pore structure