A method is presented, which enables the locally resolved calculation of multi-component gas transport in microporous media. The theoretical basis is formed by a fluid-dynamic model that comprises separate mass and momentum balances of each component in the gas mixture. By introducing component-specific slip boundary conditions, the model is made applicable to regimes of increased Knudsen numbers. After implementation into a commercial CFD-program the motion of a binary gas mixture in a virtual microporous structure is simulated. Analysis of the calculated velocity fields makes it possible to determine structural parameters that can be used in relevant 1D-models.