Diffusion in multicomponent gas adsorption on MSC5A, chromatographic study
1. Introduction The combination of chromatographic method and moment analysis of the response peaks is one of the useful techniques to study adsorption equilibrium and adsorption rate. Perturbation chromatography with the mixed multi component adsorbate gas carrier (two adsorbates) has been applied to several studies on adsorption. In this work, perturbation chromatography with multi component gas carrier (two adsorbates with inert gas) and non-equilibrium thermodynamics liner law was applied for discussion of the interference effect and the displacement effect (those are cross effects) on mass transfer in multi component gas adsorption. Moment analysis method and stop & go simulation method were utilized to obtain each mass transfer parameters of adsorbate gases. Dependency of micropore diffusion on amount adsorbed and correlation of micropore diffusion with chemical potential driving force for microporous adsorbent were discussed. Also, cross effect were discussed. Ruthven already pointed the dependency of micropore diffusivity on amount adsorbed in single component adsorption. Tondeur et al gave general background on multi component perturbation chromatography for the first moment only.
A chromatographic study of the diffusion of N2,CH4 and binary CH4‐N2 mixtures in 4A molecular sieve
The kinetics and equilibrium of sorption of CH4, N2 and binary CH4–N2 mixtures in 4A molecular sieve have been studied by a chromatographic method. The equilibrium isotherms and zeolitic diffusivities, determined with a helium carrier, show good agreement with previous gravimetric data. Counter-diffusion in the binary adsorbed phase was investigated using a mixed carrier gas and following the response to a small step change from a previously established equilibrium position. The dynamic response curves for the binary system could be satisfactorily interpreted on the assumption that both components in the mixture diffuse independently with the same intrinsic mobilities as for the single component systems. 
 
 
 
On a etudie, en employant une methode chromatographique, la cinetique et l'equilibre de sorption de CH4 et N2 et de melanges binaires de ces deux gaz, sur un tamis moleculaire 4A. Les isothermes d'equilibre et les diffusivites dans les zeolithes, qu'on a determinees avec de l'helium comme gaz porteur, ont bien concorde avec les resultats gravimetriques anterieurs. On a etudie la contre-diffusion dans la phase binaire adsorbee, en employant un gaz porteur mixte et en suivant la reponse a une demande echelon de faible amplitude par rapport a une position d'equilibre etablie anterieurement. On a pu interpreter d'une maniere satisfaisante les courbes de reponse dynamiques correspondant au systeme binaire, en supposant que les deux composants dud melange diffusent independamment avec les měmes mobilites intrinseques que dans le systeme a un seul composant.
Theoretical prediction of uptake behaviour in adsorption kinetics of binary gas mixtures using irreversible thermodynamics
The relations proposed by Ash and Barrer [1] on the basis of the thermodynamics of irreversible processes for the description of surface flow are transferred to the adsorption kinetics of binary gas mixtures. With the use of several simplifying assumptions (highly different adsorption behaviour of the two components, negligible “cross coefficients”, applicability of the Langmuir model for the equilibria), an analytical expression for the description of sorption kinetics of binary mixtures is derived, which provides a satisfactory description of experimental data obtained by us for the mixture adsorption system benzene-n-heptane/NaX-zeolite.