| abstract |
The present invention provides a method for selectively reducing CO2 to carbon monoxide or formic acid using electrical energy, a catalyst used therein, and an electrochemical reduction system. A production method based on electrochemical reduction from carbon dioxide to carbon monoxide or formic acid, characterized by comprising the following steps (a) and (b). Step (a): carbon dioxide and general formula (1) (wherein, M represents rhenium, manganese, ruthenium or iron, X represents OR 1 , SR 1 , NR 2 R 3 R 4 or PX 1 X 2 X 3 , Y Represents CO, OR 1 , SR 1 , NR 2 R 3 R 4 or PX 1 X 2 X 3 , A ring and B ring are the same or different, represent a nitrogen atom-containing heterocycle with or without substituents, R 1 represents a Or a hydrocarbon group without a substituent, 1 to 3 of R 2 , R 3 and R 4 are the same or different, representing a hydrocarbon group with or without a substituent, and the rest represent a hydrogen atom, X 1 , X 2 and X 3 1 to 3 of them are the same or different, representing a hydrocarbon group with or without a substituent or an alkoxy group with or without a substituent, and the remaining part represents a hydrogen atom or a hydroxyl group), the metal complex reaction represented by step (b) : A voltage is applied to the reactant of carbon dioxide and the metal complex represented by the general formula (1). |