Rare earth-containing alloys and method for purification of hydrogen gas therewith
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United States of America Patent
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Jul 29, 1980
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N/A
app pub date -
Jun 27, 1978
filing date -
May 26, 1975
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Expired
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Abstract
An efficient and economical method for the purification of hydrogen gas is proposed by use of an alloy of a rare earth metal with nickel and/or cobalt plus, optionally, iron, copper or chromium, utilizing the great selectivity of the alloy for the adsorption of hydrogen gas with very little adsorptivity for impurity gases commonly found in an impure hydrogen gas. The purification process is carried out by the pressurized adsorption of hydrogen on the alloy powder, followed by the recovery of high-purity hydrogen gas released from the alloy under reduced pressure or by heating. The alloy in the form of powder is preferably activated prior to use by repeated adsorption-desorption cycles of hydrogen on and from the alloy powder.
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