Hydrogen transport membranes are being developed which can operate just below the critical pressure of CO_2 at 73.9 bar (1071 psi), which when integrated with coal gasifiers and water-gas shift reactors operating at these pressures, will minimize the compression costs for CO_2 sequestration. The dense membranes, which are essentially 100% selective towards hydrogen, will produce a very clean hydrogen fuel from coal. Membranes have already been operated up to 31.0 barg (450 psig) in simulated water-gas shift mixtures and 1000 psi (69 bar) under ideal clean hydrogen-helium conditions. Concepts for integration of hydrogen transport membranes with oxygen transport membranes, coal gasifiers, water-gas shift reactors, and impurity mitigation systems are discussed.
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