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A solid amine based Regenerative CO2 Removal System (RCRS) is designed to remove carbon dioxide and water from the Space Shuttle crew compartment. Recently, an improved sorbent material designated as HS-C+ has been selected to be used in the RCRS for the Extended Duration Orbiter (EDO) missions. To characterize the solid amine-CO2 adsorption and the potential adverse effect of trace contaminants a thermogravimetric analysis method and a column test bed system were used to evaluate the CO2 adsorption performance of HS-C and HS-C+ sorbent. A model to analyze the CO2 removal performance of the two sorbent is currently under investigation. The preliminary results of the math model under various operating conditions are also discussed. This paper represents the results of the studies and testing directed toward both the HS-C and HS-C+ solid amine. The comparison between test data and simulation results as well as the initial trace contaminant testing are presented.