Production of carbon monoxide and manufacturing device

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This method for producing carbon monoxide involves producing carbon monoxide by bringing a metal oxide having oxygen ion conductivity and reversible oxygen deficiency into contact with a carbon-dioxide-containing gas while heating, and reducing the carbon dioxide according to a stoichiometric reaction. The method for producing carbon monoxide is characterized in that cerium oxide containing a rare earth element (excluding cerium) or zirconium oxide containing a rare earth element is used as the aforementioned metal oxide. In the cerium oxide containing a rare earth element (excluding cerium), the ratio of the number of moles of the rare earth element (excluding cerium) to the total number of moles of cerium and the rare earth element (excluding cerium) is preferably 0.001 to 0.5. In the zirconium oxide containing a rare earth element, the ratio of the number of moles of the rare earth element to the total number of moles of zirconium and the rare earth element is preferably 0.001 to 0.5.