Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (11): 968-972.doi: 10.3866/PKU.WHXB19951103

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Binary Gas Adsorption on Silica Gel with Different Surface Coverage

Dai Min-Guang,Miao Rui-Ping   

  1. Department of Chemistry,Fuzhou University,Fuzhou 350002
  • Received:1994-11-07 Revised:1995-02-20 Published:1995-11-15
  • Contact: Dai Min-Guang

Abstract:

The composition adsorption isotherms (ya~xg curve) for acetone-n-hexane, benzene-n-hexane, toluene-n-hexane and n-pentance-n-hexane vapor mixtures on silica gel with different surface coverage (θ) at 25℃ were measured. The experimental results indicated that the ya ~ xg curves approached gradually down to corresponding binary liquid-vapor equllibrium curves with increasing of surface coverage. Therefore, the binary adsorbed phases are similarly with the binary liquid phase. Except for acetone-n-hexane system, which had a minimum boiling point, the composition adsorption isotherms of the other three binary systems could be simulated by equation of relative volatility.

Key words: Binary gas adsorption, Silica gel, Aceton-n-hexane, Toluene-n-hexane, Benzene-n-hexane, n-Pentane-n-hexane, Surface coverage