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[0101]If a catalyst of the present invention and an electrochemical treatment are employed, carbon monoxide (CO) or formic acid can be efficiently produced from CO2 by simple means even if the CO2 is at a low concentration. Accordingly, carbon monoxide or formic acid which can be various chemical materials can be efficiently produced from a CO2-containing waste gas of facilities, such as a thermal power station or an ironworks,
Problems solved by technology
Currently, people are facing serious problems of global warming and exhaustion of carbon resources.
CO2 is, however, an end p
Method used
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synthesis example 1
Re(CO)5Br
[0200]Four (4) mL of bromine was added in a dropwise manner to dichloromethane (8 mL) containing Re2(CO)10 (4.71 g, 7.21 mmol), and the resultant was stirred at room temperature for 10 minutes. A white solid thus separated was filtered off.
[0201]Yield: 5.47 g (13.4 mmol), Yield: 93.1%
[0202]FT-IR in CH2Cl2 ν(CO) / cm−1: 2154, 2046, 1988
synthesis example 2
Re(bpy)(CO)3Br (Sometimes Abbreviated as Re—Br)
[0203]A toluene solution (60 mL) containing Re(CO)5Br (3.00 g, 7.38 mmol) and 2,2′-bipyridine (bpy) (1.27 g, 8.14 mmol) was heated to reflux overnight. A yellow solid thus separated was filtered off and dried under reduced pressure. The resultant was purified by recrystallization using acetonitrile / diethyl ether / hexane.
[0204]Yield: 3.63 g (7.18 mmol), Yield: 97.3%
[0205]ESI-MS in CH2Cl2 m / z=468 [M-PF6−]+
[0206]FT-IR in CH2Cl2 ν(CO) / cm−1: 2024, 1923, 1901
[0208]Elemental analysis: Calcd.)(° for C13H10N2O3BrRe: C, 30.84; H, 1.59; N, 5.53.
[0209]Found: C, 30.86; H, 1.46; N, 5.61.
synthesis example 3
Re(dmb)(CO)3Br
[0210]A toluene solution (60 mL) containing Re(CO)3Br (1.10 g, 2.71 mmol) and 4-4′-dimethyl-2,2′-bipyridine (dmb) (0.55 g, 3.00 mmol) was heated to reflux overnight. A yellow solid thus separated was filtered off and dried under reduced pressure.
[0211]Yield: 1.40 g (2.62 mmol), Yield: 96.7%
[0212]FT-IR in CH2Cl2 ν(CO) / cm−1, 2022, 1920, 1898
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Abstract
Disclosed herein is a method for selectively reducing, using electrical energy, CO2 to carbon monoxide or formic acid, a catalyst for use in the method, and an electrochemical reduction system. The method for producing carbon monoxide or formic acid by electrochemically reducing carbon dioxide of the present invention includes (a) reacting carbon dioxide with a metal complex represented by formula (1), and (b) applying a voltage to a reaction product of the carbon dioxide and the metal complex represented by formula (1):
Description
TECHNICAL FIELD[0001]The present invention relates to a method for electrochemically reducing carbon dioxide to carbon monoxide or formic acid, and relates to a catalyst used therefor.BACKGROUND ART[0002]Currently, people are facing serious problems of global warming and exhaustion of carbon resources. As means for solving these problems, a catalyst for converting light energy into chemical energy is attracting attention. It is expected that these problems should be solved all at once if carbon dioxide (CO2) could be converted into a useful compound using inexhaustible solar energy. CO2 is, however, an end product of oxidation of carbon compounds, and hence is both physically and chemically very stable and has very low reactivity.[0003]Recently, some techniques for converting CO2 into a useful compound through reduction have been reported. For example, Patent Literature 1 describes a method for obtaining formic acid by reacting CO2 and hydrogen in the presence of a catalyst, and Pat...
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