Correlation of multicomponent gas adsorption by the dual-site Langmuir model. Application to nitrogen/oxygen adsorption on 5A-zeolite

The dual-site Langmuir model (bimodal two-site discrete distribution with the Langmuir isotherm) provides a powerful framework to correlate multicomponent gas adsorption since it has a flexible mathematical form for pure-gas adsorption, and it provides a flexible way to describe mixed-gas competition. The model meets the requirements imposed by thermodynamic consistency. The power of this model as a correlative tool is analyzed and demonstrated by applying it to a set of single- and multicomponent data for the adsorption of nitrogen and oxygen on 5A-zeolite.