gas consisting mainly of carbon monoxide (CO) and hydrogen (H2). The term ‘shift’ in water–gas shift means changing the water gas composition (CO:H2) ratio. The ratio can be increased by adding CO2 or reduced by adding steam to the reactor. See also In situ resource utilization Lane hydrogen producer PROX Industrial catalysts Sorption enhanced water gas shift Syngas References Inorganic reactions Chemical processes Hydrogen production Industrial gases