Argon nitrogen/carbon monoxide adsorbed

The same sample of AlP04-5 was used to obtain the results shown in Figure 12.13. Here, the isotherms of methane, argon, nitrogen and carbon monoxide and the corresponding net adsorption energies were determined at 77 K after the adsorbent had teen outgassed by CRTA to 353 K. 

The energetic heterogeneity shown by nitrogen and carbon monoxide at low loading is clearly evident and is probably due to specific interactions with hydroxyl groups and defect sites. With argon, nitrogen and carbon monoxide, the adsorbate-... 

Some characteristics of channels (windows) are of the same order as the dimensions of small molecules. The diameter of the entry window determines the size of the molecules which can enter the pores of 4 A, 5 A, 8.0 A and 9.0 A (see Table 4-7). A molecular sieve of 5 A-type is the most commonly used adsorbent for separation of permanent gases, for example, nitrogen and oxygen. The elution order at room temperature is follows neon, hydrogen, argon/oxygen, nitrogen, methane, carbon monoxide etc. 

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