METHOD FOR REMOVING CARBON MONOXIDE IN REFORMED GAS

摘要

PURPOSE: To widely and easily reduce the CO content in a reformed gas even in a small-sized apparatus by mixing the reformed gas with oxygen and subsequently passing the mixed gas through a layer of a specific CO-selective oxidation catalyst. CONSTITUTION: At first, a reformed gas obtained from a hydrocarbon raw fuel (e.g. methanol) is mixed with oxygen in a ratio of <=20vol.% based on the reformed gas. Subsequently, the mixed gas is passed through a layer of CO-selective oxidation catalyst consisting of copper oxide and manganese oxide to reduce the CO content in the reformed gas to <=0.1%. The CO-selective oxidation catalyst layer is preferably operated at 50-180 deg.C. Further, the catalyst is preferably used in a state in which the surface activity is lowered in advance. The reduction of catalyst activity is achieved e.g. by exposing the catalyst to the atmosphere for a long time.