Performance of a hybrid system sorbent–catalyst–membrane for CO 2 capture and H 2 production under pre-combustion operating conditions

•Hybrid adsorbent–catalyst systems enhanced catalytic activity of WGS catalysts.•Optimum volume ratio adsorbent/catalyst depends on process temperature.•The presence of a membrane highly selective to H2 enhanced the conversion of CO.•The reverse WGS reaction occurred in presence of the membrane.•Additional amount of steam is required in the hybrid adsorbent–catalyst–membrane system to guarantee complete CO conversion.