Hydrogen-selective membrane

Details Hydrogen-selective membrane Hydrogen-selective membrane

1996-01-29

1997-07-29

Lusignan, Michael

Coating processes

Interior of hollow article coating

26050025, 427244, 427304, B05D 500, B05D 722

Patent

active

056520204

ABSTRACT:
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.

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Buxbaum, "Hydrogen Extraction via Non-porous Coated-Metal Membranes," abstract presented at AIChE annual meeting, Miami Beach, Florida (Nov. 1992).
Govind, et al., "Surface Modification of Ceramic Membranes for Selective Separation of Gases at High Temperature," Abstract presented at the Fifth Annual Meeting of the North American Membrane Society, Lexington, Kentucky (May 1992).
Uemiya, et al., "Palladium/Porous-Glass Composite Member for Hydrogen Separation," Chemistry Letters 1687-1690 (1988).

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