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化学学报
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化学学报 ›› 2009, Vol. 67 ›› Issue (16): 1829-1834. 上一篇    下一篇

研究论文

甲胺改性酸碱双功能Y沸石的制备和表征

陈筱诚 余 辉 郭 娟 贺鹤勇 傅正文 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)

  • 投稿日期:2009-02-03 修回日期:2009-03-25 发布日期:2009-08-28
  • 通讯作者: 龙英才

Preparation and Characterization of Acid-base Bifunctional Y Zeolite Modified with Methylamine

Chen, Xiaocheng Yu, Hui Guo, Juan He, Heyong
Fu, Zhengwen Long, Yingcai*
  

  1. (Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry,
    Fudan University, Shanghai 200433)
  • Received:2009-02-03 Revised:2009-03-25 Published:2009-08-28
  • Contact: Long, Yingcai

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以甲胺水溶液为改性剂, H-Y沸石可在416 K下经水热反应制备酸碱双功能甲胺杂化H-Y沸石. X 射线粉末衍射(XRD), 固体29Si魔角核磁共振(29Si MAS NMR)表征表明甲胺分子与H-Y相互作用导致沸石晶胞体积明显增大, 骨架产生新的Si—N键. 以热重(TG/DTG)及差热分析(DTA), NH3, CO2程序升温脱附(NH3-TPD和CO2-TPD)研究杂化H-Y沸石的酸-碱性质及其经不同温度焙烧后的变化, 结果表明, 杂化后沸石的酸/碱量, 尤其是后者增加甚大. 与H-Y相比, 随焙烧温度变化, 该酸-碱双功能沸石材料的酸/碱量可分别提高3至7倍和1.5至26倍.

关键词: H-Y沸石, 甲胺, 杂化, 改性, 酸碱双功能

An acid-basic bifunctional amine-hybrid H-Y zeolite has been hydro-thermally prepared at 416 K with methylamine solution as a modifier. Characterized with X-ray powder diffraction (XRD) and solid state 29Si magic-angle spinning nuclear magnetic resonance (29Si MAS NMR), the obvious increase of cell volume and the appearance of new Si—N bonds in the framework have been observed. The acid-basic properties of the hybrid zeolite, investigated with TG/DTG/DTA and NH3-TPD or CO2-TPD, have been proved to be greatly enhanced. As pre-calcination at different temperatures, the acid amount and basic amount of the modified zeolite increase 3 to 7 times and 1.5 to 26 times respectively, in comparison with those of H-Y zeolite.

Key words: H-Y zeolite, methylamine, hybridation, modification, acid-base bifunctional