Entfernung von Ammoniak aus einem Gasstrom einer Säure-Brennstoffzelle

摘要

Ammonia which is found in fuel cell fuel gases is removed therefrom by passing the fuel gas stream through a scrubber bed of porous carbon pellets containing phosphoric acid. The ammonia reacts with the phosphoric acid in the scrubber bed to form ammonium phosphate compounds which remain in the scrubber bed. The ammonia content of the fuel gas stream is thus lowered to an acceptable concentration. The temperature of the fuel gas stream passing through the scrubber bed is lowered to minimize the amount of phosphoric acid which evaporates into the fuel gas stream and extend the scrubber operating life.