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Hydrogen-selective membrane

United States Patent

5,652,020
July 29, 1997
View the Complete Patent at the US Patent & Trademark Office
A hydrogen-selective membrane comprises a tubular porous ceramic support having a palladium metal layer deposited on an inside surface of the ceramic support. The thickness of the palladium layer is greater than about 10 .mu.m but typically less than about 20 .mu.m. The hydrogen permeation rate of the membrane is greater than about 1.0 moles/m.sup.2. s at a temperature of greater than about 500.degree. C. and a transmembrane pressure difference of about 1,500 kPa. Moreover, the hydrogen-to-nitrogen selectivity is greater than about 600 at a temperature of greater than about 500.degree. C. and a transmembrane pressure of about 700 kPa. Hydrogen can be separated from a mixture of gases using the membrane. The method may include the step of heating the mixture of gases to a temperature of greater than about 400.degree. C. and less than about 1000.degree. C. before the step of flowing the mixture of gases past the membrane. The mixture of gases may include ammonia. The ammonia typically is decomposed to provide nitrogen and hydrogen using a catalyst such as nickel. The catalyst may be placed inside the tubular ceramic support. The mixture of gases may be supplied by an industrial process such as the mixture of exhaust gases from the IGCC process.
Collins; John P. (Boulder, CO), Way; J. Douglas (Boulder, CO)
The State of Oregon Acting By and Through the State Board of Higher (Corvallis, OR)
08/ 593,013
January 29, 1996
GOVERNMENTAL SUPPORT This invention was made in part with governmental support provided by the United States Department of Energy under contract number DE-AC21-89MC26373. The United States government may have certain rights in this invention.