The dynamic version of the Wicke-Kallenbach diffusion cell with one compartment closed and equipped with a sensitive pressure gauge was used for determination of sets of Mean Transport Pore Model and Dusty Gas Model parameters for an industrial catalyst (ICI 52-1 in reduced form). The dynamic pressure responses due to gas composition step changes of inert gases (H-2, He, N-2, Ar) were measured and fitted to the system of partial differential equations which describe the transport (mass balances with Maxwell-Stefan constitutive equations). The optimum textural parameters were obtained by simultaneous matching of all experiments. The model parameters are material constants of the porous solid and, thus, do not depend on temperature, pressure and kind of the transported gases. Both diffusion models gave a good agreement between experiments and calculations. The parameter reliability is discussed.