The analysis of adsorption isotherms was based on the calculation of differential distributions of the amount adsorbed with respect to the adsorption potential.
It appears that the filling of Cu-BTC micro pores with nitrogen occurs in two steps due to specific interaction of nitrogen molecules with open metal sites. In contrast to nitrogen,the filling of Cu-BTC micro pores with argon takes place in one step.
The micro pores of Fe-BTC are filled with nitrogen and argon gradually in two featureless stages indicating the unordered porous structure.
Fe-BTC show one saturation step being less sharp than in the case of Cu-BTC.
This domination is especially pronounced for cyclopentane adsorbed on Cu-BTC
In the case of Fe-BTC