物理化学学报 >> 1999, Vol. 15 >> Issue (12): 1092-1097.doi: 10.3866/PKU.WHXB19991208

研究论文 上一篇    下一篇

β沸石骨架稳定性与表面酸性的红外光谱研究

张建业, 李宣文, 刘兴云   

  1. 北京大学化学与分子工程学院,北京 100871
  • 收稿日期:1999-02-09 修回日期:1999-06-09 发布日期:1999-12-15
  • 通讯作者: 李宣文

Study on the Framework Stability and Surface Acidity of Hβ Zeolite by lnfrared Spectroscopy

Zhang Jian-Ye, Li Xuan-Wen, Liu Xing-Yun   

  1. College of Chemistry Molecular Engineering,Peking University,Beijing 100871
  • Received:1999-02-09 Revised:1999-06-09 Published:1999-12-15
  • Contact: Li Xuan-Wen

摘要:

用红外光谱法研究了真空热脱附和空气中焙烧两种不同的方法脱除模板剂对Hβ沸石骨架结构稳定性和表面酸性的影响. 结果表明,在真空条件下加热脱除模板剂,其骨架结构保持完好且质子酸中心最多. 而在空气中焙烧脱除模板剂, 导致沸石骨架部分脱铝, 形成大量的Lewis酸且耐酸性极差.

关键词: β沸石, 脱模板剂, 骨架稳定性

Abstract:

The framework stability and surface acidity of zeolite β have been studied by infrared spectroscopy. The results show that the framework stability and surface acidity of H β zeolite depend on the experimental condition of template removal from the parent β zeolite. With thermal decomposition in vacuum at 450 ℃ and 550 ℃, the IR spectrum of H β exhibited exclusively two intense bands (3610 cm -1 and 3740 cm -1 )showing relatively ideal of its framework and high Bronsted acidity. If the template was burned off in air at 550 ℃,the 3610 cm -1 band of H β diminished considerably and two new IR bands (3780 cm -1 and 3670 cm -1 ) appeared, indicating the obvious framework dealumination. The later H β showed high Lewis acidity.

Key words: Zeolite β, Template removal, Framework stability