All coal gasification-based conversion processes require removal of hydrogen sulfide (H2S; an acid gas) from the syngas as part of the overall plant configuration. Typical acid gas removal (AGR) processes employed for gasification design are either a chemical solvent system (e.g., amine gas treating systems based on MDEA, for example) or a physical solvent system (e.g., Rectisol or Selexol). Process selection is mostly dependent on the syngas cleanup requirement and costs. Conventional chemical/physical AGR processes using MDEA, Rectisol or Selexol are commercially proven technologies and can be designed for selective removal of CO2 in addition to H2S from a syngas stream. For significant capture of CO2 from a gasification plant (e.g. > 80%) the CO in the syngas must first be converted to CO2 and hydrogen (H2) via a water-gas-shift (WGS) step upstream of the AGR plant.