Adsorption on Non-Porous Surface

The only experiment of binary adsorption on non-porous materials, at least to this author s knowledge, where the adsorbates are different enough to have differing E s and differing A s is that by Arnold [36]. Arnold studied 

The resultant binary plot with the ratios of the pressures staying constant at 50.2% O2 and 49.8% N2 is shown in Fig. 92 along with the calculation. The overall picture is fairly close with the offset in the 

The data by Arnold, which after all was performed with instrumentation that today would be considered rudimentary, reveal a fair agreement between experiment and the x theory. Surely, more experiments along this line with modem instmments would be very useful. 

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These comparisons are intimately intertwined with the use of adsorption equations of which the DR equation relates directly to micropore filling, the BET equation initially being designed to describe adsorption on non-porous surfaces. The use of the DR equation to interpret isotherms, obtained at low relative pressures, of both nitrogen and carbon dioxide, provides a rapid method for the characterization of microporosity and the analysis of mechanisms of development of porosity during activation processes. The processes of adsorption of nitrogen and carbon dioxide into microporosity are different as explained below. 

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