Hydrogen production

Details Hydrogen production Hydrogen production

1989-07-18

1991-07-09

Langel, Wayne A.

Chemistry of inorganic compounds

Hydrogen or compound thereof

Elemental hydrogen

252373, 423652, 423656, C01B 316, C01B 348

Patent

active

050304402

ABSTRACT:
A gas stream containing hydrogen, carbon monoxide, and steam, and having a steam to dry gas molar ratio below 0.5 and a steam to carbon monoxide molar ratio above 0.5, and that has been formed at a temperature above 700.degree. C., is passed, at a temperature within the range 550.degree. to 650.degree. C., over an iron-free catalyst effective at such temperatures to catalyze the shift reaction. This effects some shift reaction thus increasing the amount of high grade heat that can be recovered from the gas. Also the hydrogen content of the gas is increased and the carbon monoxide to carbon dioxide ratio of the gas is decreased, thus decreasing the risk of hydrocarbon formation if the gas is subsequently subjected to a further shift reaction using an iron-oxide containing catalyst. Suitable catalysts comprise palladium and/or an oxide of an alkali, or alkaline earth, metal on a refractory support.

REFERENCES:
patent: 3850840 (1974-11-01), Aldridge et al.
patent: 4233180 (1980-11-01), Hausberger et al.
patent: 4257920 (1981-03-01), Sugier et al.
patent: 4338292 (1982-07-01), Duranleau
patent: 4452854 (1984-06-01), Merriam et al.
Springer-Verlag New York Inc., Catalyst Handbook, Wolfe Scientific Books, 1970, p. 23.

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