Perovskite/Oxide Composites as Mixed Protonic/Electronic Conductors for Hydrogen Recovery in IGCC Systems
Department of Energy
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Small Business Information
2425 South 900 West, Salt Lake City, UT, 84119
Socially and Economically Disadvantaged:
Abstract70103 Integrated Gasification Combined Cycle (IGCC) systems are promising new alternatives for highly efficient and environmentally friendly power generation. In order to make these systems commercially viable, a portion of the hydrogen in syngas needs to be recovered as a value-added byproduct through the use of hydrogen separation membranes such as proton-conducting membranes. Since current membrane technologies for hydrogen separation are incompatible with the high-temperature, high-pressure environment in IGCC systems, robust and efficient membrane systems are required. This project will develop a novel, dense, ceramic-composite membrane that will function as a mixed protonic/electronic conductor under expected IGCC operating conditions. These mixed-conducting composite membranes will allow pressure-driven hydrogen separation at 800-900¿C, and at higher flux-rates than possible with single phase membranes, thus resulting in a very-high-purity hydrogen stream. In Phase I, the feasibility of the process for forming mixed conducting protonic/electronic conductors was demonstrated. It was determined that a flux of over 9 cc/cm2/min through a 15 cm membrane can be achieved. Additionally, it was demonstrated that the new materials have increased thermochemcial stability in CO2-containing atmospheres, compared to materials in conventional proton conductors. In Phase II, a single-wafer module will be built and tested to demonstrate the hydrogen flux necessary for commercial feasibility. Commercial Applications and Other Benefits as described by awardee: The hydrogen separation membrane should have a major impact on the commercial feasibility of IGCC systems and other industrial hydrogen recovery/separation processes. Further, this membrane should be applicable to such emerging technologies as intermediate-temperature fuel cells based on proton-conducting electrolytes.
* information listed above is at the time of submission.