Transport and reaction of gas mixtures in porous media are common phenomena in many chemical engineering applications. One favored method of modeling the transport processes is to notionally substitute a uniform bundle of tortuous channels for the irregular porous structure. Then, accurate equations of motion for the gas flow and diffusion inside these small-sized channels can be used. This advantage comes at the cost of two additional parameters that enter into the equations, the tortuosity factor and the equivalent capillary diameter. In this work, an existing model for transient transport of multi-component gas mixtures has been expanded to comprise heterogeneous fluid domains and chemical reaction. It can be applied to fluid domains that partially or completely enclose porous regions. The potential of the present model is demonstrated by simulating the electro-chemically induced and transport-limited signal formation inside an exhaust gas sensor.

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