Abstract A key challenge for future clean power or hydrogen projects via gasification is the need to reduce the overall cost while achieving significant levels of CO 2 capture. The current state of the art technology for capturing CO 2 from sour syngas uses a physical solvent absorption process (acid gas removal–AGR) such as Selexol™ or Rectisol ® to selectively separate H 2 S and CO 2 from the H 2 . These two processes are expensive and require significant utility consumption during operation, which only escalates with increasing levels of CO 2 capture. Importantly, Air Products has developed an alternative option that can achieve a higher level of CO 2 capture than the conventional technologies at significantly lower capital and operating costs. Overall, the system is expected to reduce the cost of CO 2 capture by over 25%. Air Products developed this novel technology by leveraging years of experience in the design and operation of H 2 pressure swing adsorption (PSA) systems in its numerous steam methane reformers. Commercial PSAs typically operate on clean syngas and thus need an upstream AGR unit to operate in a gasification process. Air Products recognized that a H 2 PSA technology adapted to handle sour feedgas (Sour PSA) would enable a new and enhanced improvement to a gasification system. The complete Air Products CO 2 Capture technology (CCT) for sour syngas consists of a Sour PSA unit followed by a low-BTU sour oxycombustion unit and finally a CO 2 purification / compression system.