Patent ID: 6852302

Claim:
A method of operating a carbon monoxide removing apparatus comprising 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; an oxidizing gas supply unit of supplying an oxidizing gas containing oxygen to the catalytic reaction unit; and a temperature measuring unit and a heater provided in the catalytic reaction unit, the method comprising the steps of supplying an oxidizing gas containing oxygen to a catalytic reaction unit of the carbon monoxide removing apparatus, wherein the oxidizing gas is supplied from an oxidizing gas supply unit, and the oxidizing gas is supplied substantially in an amount of one-half to two times the reaction equivalent of carbon monoxide at a regular operation; and continuing to supply the oxidizing gas to the catalytic reaction unit after ceasing to supply the hydrogen gas containing carbon monoxide from the hydrogen gas supply unit to the catalytic reaction unit, wherein the catalytic reaction unit is at a temperature of 120° C. to 200° C. when the apparatus is stopped.