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Method for electrocatalytic reduction of carbon dioxide using multi-metal oxygen cluster ionic liquid as electrocatalyst

A technology of polymetallic oxygen clusters and ionic liquids, which is applied in the fields of chemical engineering and the environment, can solve problems such as slow reaction rates and difficulties in obtaining electronic products, and achieve the effects of improving efficiency, reducing initial reduction obstacles, and easily obtaining raw materials

Active Publication Date: 2014-09-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The vast majority of homogeneous catalysis has clearly shown the advantages of product specificity and high current efficiency, but the existing problem lies in the electroreduction of CO 2 The reaction rate is slow and often only 2-electron reduction process occurs, it is difficult to obtain higher-order multi-electron products

Method used

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  • Method for electrocatalytic reduction of carbon dioxide using multi-metal oxygen cluster ionic liquid as electrocatalyst
  • Method for electrocatalytic reduction of carbon dioxide using multi-metal oxygen cluster ionic liquid as electrocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The first step [C 2 mim] 3 PMo 12 o 40 Synthesis of Ionic Liquids

[0023] The synthesis process is to add 150ml containing 0.5734g (0.003mol) [C 2 mim] Br aqueous solution, stirring and dripping 150ml containing 1.8252g (0.001mol) aqueous solution of phosphomolybdic acid, the mixture gradually becomes turbid, after the reaction is finished, the mixed solution is left to stand and filtered, ethanol is repeatedly rinsed, and the product obtained is placed in 60 ℃ in a vacuum oven for 48 hours to obtain a yellow solid [C 2 mim] 3 PMo 12 o 40 .

[0024] The second step [C 2 mim] 3 PMo 12 o 40 Electrocatalytic reduction of CO as an electrocatalyst 2

[0025] Will [C 2 mim] 3 PMo 12 o 40 Ionic liquid (0.0509g), potassium perchlorate (2.771g), and DMF (100mL) were added to a quartz reactor with a three-electrode system, electrolyzed at a constant voltage (-0.5V) for 4 hours, and gas products were taken every hour for detection. The gaseous product is CO, 40...

Embodiment 2

[0027] The first step [C 2 mim] 3 PMo 12 o 40 Synthesis of Ionic Liquids

[0028] The synthesis process is to add 150ml containing 0.5734g (0.003mol) [C 2 mim] Br aqueous solution, stirring and dripping 150ml containing 1.8252g (0.001mol) aqueous solution of phosphomolybdic acid, the mixture gradually becomes turbid, after the reaction is finished, the mixed solution is left to stand and filtered, ethanol is repeatedly rinsed, and the product obtained is placed in 60 ℃ in a vacuum oven for 48 hours to obtain a yellow solid [C 2 mim] 3 PMo 12 o 40 .

[0029] The second step [C 2 mim] 3 PMo 12o 40 Electrocatalytic reduction of CO as an electrocatalyst 2

[0030] Will [C 2 mim] 3 PMo 12 o 40 Ionic liquid (0.0509g), potassium perchlorate (2.771g), and DMF (100mL) were added to the quartz reactor of the three-electrode system, electrolyzed at a constant voltage (-0.9V) for 4 hours, and gas products were taken every hour for detection. The gaseous product is CO, 5...

Embodiment 3

[0032] The first step [C 2 mim] 3 PMo 12 o 40 Synthesis of Ionic Liquids

[0033] The synthesis process is to add 150ml containing 0.5734g (0.003mol) [C 2 mim] Br aqueous solution, stirring and dripping 150ml containing 1.8252g (0.001mol) aqueous solution of phosphomolybdic acid, the mixture gradually becomes turbid, after the reaction is finished, the mixed solution is left to stand and filtered, ethanol is repeatedly rinsed, and the product obtained is placed in 60 ℃ in a vacuum oven for 48 hours to obtain a yellow solid [C 2 mim] 3 PMo 12 o 40 .

[0034] The second step [C 2 mim] 3 PMo 12 o 40 Electrocatalytic reduction of CO as an electrocatalyst 2

[0035] Will [C 2 mim] 3 PMo 12 o 40 Ionic liquid (0.0509g), potassium perchlorate (2.771g), and DMF (100mL) were added to the quartz reactor of the three-electrode system, electrolyzed at a constant voltage (-1.1V) for 4 hours, and gas products were taken every hour for detection. The gaseous product is CO, ...

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Abstract

The invention relates to a method for electrocatalytic reduction of CO2 using multi-metal oxygen cluster ionic liquid as electrocatalyst. The method is characterized in that positive ions of the multi-metal oxygen cluster ionic liquid are imidazoles [Cnmim]+(n=2, 4, 6, 8), pyridines [Cnpyr]+(n=2, 4) and quaternary ammonium salts [N4444]+, and negative ions of the multi-metal oxygen cluster ionic liquid are phosphotungstic acid negative ions (PW12O403-) and phosphomolybdic acid negative ions (PMo12O403-); and the electrocatalytic reduction reaction is a three-electrode system, wherein a glassy carbon electrode is a working electrode, a platinum sheet electrode is a counter electrode, and a saturated calomel electrode is a reference electrode. The method is simple in process and convenient in operation, performs the electrocatalytic reduction for the CO2 to form such fuels as methane and carbon monoxide, realizes the resource utilization of the CO2, reduces the atmospheric pollution, and has important significance on the environmental protection.

Description

[0001] Technical field: The present invention relates to the field of chemical engineering and environmental technology, a kind of electrocatalytic reduction of CO using polymetallic oxygen cluster ionic liquid as an electrocatalyst 2 Methods. Background technique: [0002] Burning of fossil fuels releases excess CO into the atmosphere 2 The resulting greenhouse effect has become the most severe challenge facing the entire human race. At the same time CO 2 It is also a valuable carbon resource, about CO 2 The study of fixation-transformation utilization has become one of the hot topics that are generally concerned by countries all over the world. will CO 2 The reduction to hydrocarbon fuels such as methanol and methane can not only save fossil resources such as oil, natural gas and coal, but also solve the problems of energy shortage and environmental pollution. CO 2 There are many conversion and fixation methods, among which the CO 2 Reduction into useful substances is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00B01J31/18
Inventor 韩丽君张锁江李红花
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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