The paper contains a proposition of a model of adsorption ill porous and granular materials. It is assumed that the mass sourer resulting from adsorption consists of two contributions: changes described by the Langmuir relation for bare sites and changes of the internal surface due to relaxation of porosity. The model Is illustrated by a simple numerical example of a homogeneous adsorption process. MSC (2000). 74E20, 74E30. 80A17. [References: 9]
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