A method for separating hydrogen from a high pressure gas containing hydrogen and carbon dioxide using a vanadium/nickel alloy membrane having a palladium coating, the membrane containing from zero up to about 10 atomic percent nickel, and having a thickness of from about 75 to about 500 microns. The membrane is employed at a temperature of from about 300 to about 440.degree. C., under a pressure of from about 250 to about 500 psia, and a hydrogen partial pressure gradient across the membrane is maintained to provide a hydrogen partial pressure on the permeate side of the membrane of from about 0.02 to about 2 psia.
STATEMENT OF GOVERNMENT INTEREST
 This invention was made with the support of the United States Department of Energy under DOE Contract No. DE-FC26-01NT41145. The Government has certain rights in the invention.