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Adsorption from Experimental Isotherms of Supercritical Gases

ZHOU Li; ZHOU Yaping

  

  1. a Hydrogen Energy Research Center
    b Department of Chemistry, Tianjin University, Tianjin 300072, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2001-03-28 Published:2001-03-28
  • Contact: ZHOU Li

基于实验等温线确定超临界气体绝对吸附量的数学方法

周理; 周亚平   

  1. a Hydrogen Energy Research Center
    b Department of Chemistry, Tianjin University, Tianjin 300072, China
  • 通讯作者: 周理

Abstract: A mathematical method was proposed for the determination of absolute adsorption from
experimental isotherms. The method is based on the numerical equality of the absolute and
the excess adsorption when either the gas phase density or the amount adsorbed is not quite
considerable. The initial part of the experimental isotherms, which represents the absolute
adsorption, became linear with some mathematical manipulations. The linear isotherms were
reliably formulated. As consequence, either the volume or the density of the supercritical
adsorbate could be determined by a non-empirical way. This method was illustrated by the
adsorption data of supercritical hydrogen and methane on a superactivated carbon in large
ranges of temperature and pressure.

Key words: supercritical adsorption, absolute adsorption, physical state of adsorbate, physisorption equilibrium

摘要: A mathematical method was proposed for the determination of absolute adsorption from
experimental isotherms. The method is based on the numerical equality of the absolute and
the excess adsorption when either the gas phase density or the amount adsorbed is not quite
considerable. The initial part of the experimental isotherms, which represents the absolute
adsorption, became linear with some mathematical manipulations. The linear isotherms were
reliably formulated. As consequence, either the volume or the density of the supercritical
adsorbate could be determined by a non-empirical way. This method was illustrated by the
adsorption data of supercritical hydrogen and methane on a superactivated carbon in large
ranges of temperature and pressure.

关键词: supercritical adsorption;absolute adsorption;physical state of adsorbate;physisorption equilibrium