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This paper investigates the CO 2 capture energy consumption via elevated-temperature pressure swing adsorption (ET-PSA) for CO 2/H 2 separation. IGCC power plants with ET-PSA, with the conventional Selexol process and without CO 2 capture are built in Aspen Plus. The CO 2 capture energy consumption of ET-PSA is evaluated by the specific primary energy consumption for CO 2 avoided (SPECCA), which is a function of the net electrical efficiency and the specific CO 2 emission rate. The ET-PSA unit with different processes simulated in gPROMS is coupled into the IGCC model, the operation parameters of which are analyzed to achieve the lowest SPECCA. The results show that the CO 2 capture energy consumption has a tendency to decrease by increasing the adsorption time, the residence time, and the purge-to-feed ratio; reducing the purge ratio; and adding the CO 2 reflux. The SPECCA of ET-PSA …