A method for purifying carbon monoxide, which can efficiently remove metal carbonyl
in carbon monoxide while suppressing the production of carbon dioxide, is provided
by selecting a metal oxide having proper oxidizability as a reactant with metal
carbonyl. Carbon monoxide containing metal carbonyls as trace impurities is contacted
with a remover containing manganese sesquioxide as a main component, thereby reacting
metal carbonyl in carbon monoxide with said manganese sesquioxide to remove said
metal carbonyl from said carbon monoxide.
