物理化学学报 >> 1995, Vol. 11 >> Issue (10): 912 -915 .doi: 10.3866/PKU.WHXB19951011

研究简报 上一篇    下一篇

沸石的孔口改性与气体吸附分离

乐英红,唐颐,高滋   

  1. 复旦大学化学系,上海 200433
  • 收稿日期:1994-09-19 修回日期:1995-01-07 发布日期:1995-10-15
  • 通讯作者: 高滋

Fine Control of Zeolite Pore-opening Size and Gas Separation

Yue Ying-Hong,Tang Yi,Gao Zi   

  1. Department of Chemistry,Fudan University,Shanghai 200433
  • Received:1994-09-19 Revised:1995-01-07 Published:1995-10-15
  • Contact: Gao Zi

关键词: N2/O2分离, CH4/N2分离, 沸石, 化学气相沉积, 孔口改性

Abstract:

The performance of various types of zeolites for N2/O2 and CH4/N2 separation has been studied. The separation factors αN2/O2 and αCH4/N2 for all the Na-form zeolites are < 1. Compared with Na-form zeolites, H-form zeolites adsorb larger quantities of O2 and smaller quantities of N2, so αN2/O2 is increased, but αCH4/N2 is reduced. On the contrast, Ca-form zeolites adsorb larger quantities of N2, so αN2/O2 is reduced but αCH4/N2 is increased. However the αN2/O2 and αCH4/N2 for both H- and Ca- form zeolites are <1.The changes in adsorption behavior can be explained in the light of energetics of sorption in zeolites. Chemical vapor deposition with silicon methoxide has been used to control the pore-opening size of the zeolites. As the amount of SiO2 deposition on NaA is increased, the adsorption of the bulkier component in the binary gas mixture is suppressed, so the values of αN2/O2 and αCH4/N2 for SiNaA zeolites are increased quickly to >1. Experimental results show that if the right type of zeolite is chosen fine control of zeolites pore-opening size through chemical vapor deposition has a potential as a good method for preparing high selective adsorbent in gas separation.

Key words: N2/O2 separation, CH4/N2 separation, Zeolites, Chemical vapor deposition, Controlled pore-opening size