Gas: heating and illuminating – Purifiers
Reexamination Certificate
2005-11-15
2005-11-15
Ridley, Basia (Department: 1764)
Gas: heating and illuminating
Purifiers
C048S127900, C048S075000, C048S10200R, C048S094000, C048S107000, C048S095000, C048S119000, C422S198000, C422S198000, C422S198000, C422S198000, C422S209000, C422S211000, C422S222000, C422S223000, C429S010000, C429S010000, C429S006000
Reexamination Certificate
active
06964692
ABSTRACT:
An apparatus removes carbon monoxide (CO) from a hydrogen-rich gas stream in a hydrogen fuel cell system. CO fouls costly catalytic particles in the membrane electrode assemblies of proton exchange membrane (PEM) fuel cells. A vessel houses a carbon monoxide adsorbent. The vessel may be a rotating pressure swing adsorber. A water gas shift reactor is upstream of the rotating pressure swing adsorber. The water gas shift reactor may include a second adsorbent adapted to adsorb carbon monoxide at low temperatures and to desorb carbon monoxide at high temperatures. The apparatus advantageously eliminates the use of a preferential oxidation (PROX) reactor, by providing an apparatus which incorporates CO adsorption in the place of the PROX reactor. This cleans up carbon monoxide without hydrogen consumption and the concomitant, undesirable excess low grade heat generation. The present invention reduces start-up duration, and improves overall fuel processor efficiency during normal operation.
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Gittleman Craig S.
Pettit William H.
Voecks Gerald E.
General Motors Corporation
Harness & Dickey & Pierce P.L.C.
Ridley Basia
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