The Methanol Adsorption in Microporous Alumina Agglomerates

Grygorii Dragan,Mykola Poletaiev,Kyrylo Kolesnykov,Volodymyr Kutarov,Mariya Khlebnikova

doi:10.3390/colloids3010022

Grygorii Dragan, Mykola Poletaiev + Show 3 more

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https://doi.org/10.3390/colloids3010022

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Abstract

We have studied theoretical and experimental methods of methanol adsorption in micropores of aluminum oxide agglomerates obtained by gas-dispersion synthesis. It is shown that the necessity to use strict equations based on the theory of volume filling of micropores, which implies a physical and formal analogy between the volume filling of micropores and capillary condensation, for qualitative and quantitative description of adsorption equilibrium in open slit-like micropores. The applicability of the proposed equations for the description of adsorption equilibrium in such systems is demonstrated on the example of experimental methanol adsorption/desorption isotherm on the aluminum oxide, which possesses a microporous structure.

Highlights

Porous bodies that possess micro- and mesopores are widely used in various technological processes, in ecology and medicine in connection with the adsorption of molecular gases on the developed pore surface
When the characteristic size of the slit-like pores increase, and the ratio of the pore width to the diameter of the adsorbate molecule is in the interval 1 < h/σ < 2, the adsorption process is determined both by the interaction of the adsorbate molecules and the interaction of the adsorbate molecules with the force field of a very narrow pore
theory of volume filling of micropores (TVFM) was based on the assumption that the adsorption in the pores should be treated by volume filling rather than by layer-by-layer filling

Summary

Introduction

Porous bodies that possess micro- and mesopores are widely used in various technological processes, in ecology and medicine in connection with the adsorption of molecular gases on the developed pore surface. When the characteristic size of the slit-like pores increase, and the ratio of the pore width to the diameter of the adsorbate molecule is in the interval 1 < h/σ < 2, the adsorption process is determined both by the interaction of the adsorbate molecules and the interaction of the adsorbate molecules with the force field of a very narrow pore. In the latter case, the potentials of the walls pores overlap. For the pores with characteristic size above, 2σ adsorption occurs via condensation [2]

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