CO2-sorption enhanced water gas shift (WGS) reaction is a process which carries out simultaneously the WGS reaction for the production of a pure stream of H2 and the removal of CO2 from the reaction zone by using a CO2 sorbent in a single unit operation. The sorption enhanced reaction (SER) can circumvent the thermodynamic limitation of the WGS reaction and enhance the rate of forward reaction. To fulfill the SER concept successfully, the development of CO2 adsorbents that can adsorb CO2 at high temperature (200-400°C) is most important. In this study, K2CO3-promoted hydrotalcite was tested for a high-temperature CO2 chemisorbent and its CO2 sorption characteristics were analyzed. The thermogravimetric analysis showed that CO2 sorption capacity of K2CO3-promoted hydrotalcite can be about ten times higher than that of pristine hydrotalcite. Also, there is an optimal amount of K2CO3 impregnated for the highest CO2 sorption capacity. Using the K2CO 3-promoted hydrotalcite, the SER concept for WGS was successfully tested by both experiments and numerical simulations.