An apparatus of removing carbon monoxide, has:
a hydrogen gas supply unit of supplying a hydrogen gas,
a catalytic reaction unit provided with a catalyst body carrying a platinum
group metal catalyst,
a hydrogen gas introducing unit which introduces a hydrogen gas containing
carbon monoxide from the hydrogen gas supply unit to the catalytic
reaction unit, and
an oxidizing gas supply unit of supplying an oxidizing gas containing
oxygen to the catalytic reaction unit,
wherein
the catalyst body is brought into an oxidizing atmosphere for a period of
time during operation according to a predetermined condition or when the
apparatus is stopped. Thus, carbon monoxide can be eliminated
sufficiently.
