Improved Membranes for Hydrogen Separation

Improved hydrogen separation membranes are needed for next generation power systems. Recent advances in metal membrane technology have identified a Pd alloy composite membrane that is not susceptible to embrittlement and poisoning problems, which have prevented widespread industrial use of Pd for high-temperature H2 separation. However, there is still a need to prepare thin membranes on porous stainless steel substrates, in order to provide the robustness and ruggedness required in industrial processes. This project will develop a simple and effective technique to modify the surface of stainless steel supports, in order to allow preparation of very thin Pd alloy films. Phase I will develop a prototype water-gas shift reactor for preparing the membranes, and its performance will be demonstrated in a simulated coal-derived syngas (H2S, COS, NH3 and HCl). Commercial Applications and Other Benefits as described by the awardee: The Pd alloy membranes should find use in the separation of hydrogen in hydrocarbon reforming, in the water-gas shift reaction, and in coal gasification for power generation in fuel cells. Compared to conventional systems, the use of this technology has the potential to reduce energy consumption, capital costs, and the number of unit operations.