Efficiently separating CO2 from H-2 is one of the key steps in the environmentally responsible uses of fossil fuel for energy production. A wide variety of resources, including petroleum coke, coal, and even biomass, can be gasified to produce syngas (a mixture of CO and H-2). This gas stream can be further reacted with water to produce CO2 and more H-2. Once separated. the CO2 can be stored in a variety of geological formations or sequestered by other means. The H-2 can be combusted to operate a turbine, producing electricity, or used to power hydrogen fuel cells. In both cases, only water is produced as waste. An amine-functionalized ionic liquid encapsulated in a supported ionic liquid membrane (SILM) can separate CO2 from H-2 with a higher permeability and selectivity than any known membrane system. This separation is accomplished at elevated temperatures using facilitated transport supported ionic liquid membranes. (c) 2008 Elsevier B.V. All rights reserved.