To study the dynamic behavior of an adsorption bed, adsorption equilibrium was investigated first and uptake curves were obtained in order to determine effective diffusivity(defined by solid diffusion model), and then the effective diffusivity was used for studying characteristics of sorption rate and simulating the adsorption bed behavior using adsorption rate models by LDF, Vermeulen, and Nakao-Suzuki. LRC isotherm model predicted adsorption equilibrium of the gas mixture(H2/CO)well and was employed in the simulation of an adsorption bed. Comparison of uptake curves obtained by T.G.A. method with those estimated by adsorption rate models showed the following; LDF model predicted lower adsorption amount than experimental by T.G.A. method at the early stage of adsorption, while Vermeulen model predicted higher. However, Glueckauf LDF model showed good agreement with experimental data under the condition of D_et/R_p²>0.1. FCS(flux corrected scheme)was used satisfactorily for eliminating numerical oscillation in simulation of an adsorption bed. A theoretical analysis by Nakao-Suzuki model with optimum coefficient, K, obtained by matching the experimental uptake curve, showed that it provided a satisfactory prediction of the observed breakthrough curve in comparison with other models. LRC was more suitable to predict breakthrough curve than Langmuir isotherm. From the result of breakthrough curve under isothermal conditions, it was shown that energy balance should be included in the simulation of the adsorption bed behavior and breakthrough curve had a long tail probably caused by the adsorption heat and heat loss.