Abstract
A linearized implicit finite-difference scheme for solving diffusion equations is developed. The algorithm has been used for modelling multicomponent diffusion dynamics in a pellet of porous catalyst under unsteady-state conditions caused by a change of gas composition at the pellet outer surface. This allows us to prove the reliability of the unsteady-state Stefan—Maxwell diffusion equations and to check textural parameters of porous solids under dynamic conditions in the absence of adsorption and reaction. The method has been applied to modelling of unsteady diffusion of a ternary H 2/N 2/He gaseous mixture in a porous pellet. The procedure developed can be used for a wide class of diffusion processes on porous materials (catalysts, adsorbents etc.).
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