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Catalyst for electrochemically reducing carbon dioxide into carbon monoxide and preparation method of catalyst

A technology for carbon dioxide and carbon monoxide, which is applied to the field of copper-silver alloy catalysts for electrochemically reducing carbon dioxide to carbon monoxide and its preparation, can solve problems such as high overpotential, and achieve high CO current efficiency, excellent catalytic activity, and improved CO partial current density. Effect

Inactive Publication Date: 2017-02-15
BEIJING FUMEIJIA ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The study found that the silver catalyst has a high selectivity for the reduction of carbon dioxide to carbon monoxide, but the disadvantage is that a high overpotential is required

Method used

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  • Catalyst for electrochemically reducing carbon dioxide into carbon monoxide and preparation method of catalyst
  • Catalyst for electrochemically reducing carbon dioxide into carbon monoxide and preparation method of catalyst
  • Catalyst for electrochemically reducing carbon dioxide into carbon monoxide and preparation method of catalyst

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preparation example Construction

[0037] The catalyst of the present invention is a nano-copper-silver alloy loaded on a carbon carrier, and the preparation method of the catalyst comprises S1: a step of preparing a precursor solution; S2: a step of adding a carbon carrier; S3: a step of wet chemical reduction. However, those skilled in the art can understand that the preparation method of the present invention is not limited to the above-mentioned 3 steps, and in addition to the above-mentioned 3 steps, can also include, for example, the pre-filtering step, cleaning step, drying step and crushing step described later.

[0038] Hereinafter, the above-mentioned steps S1 to S3 and other steps will be sequentially described.

[0039] S1: Prepare the precursor solution step

[0040] Weigh the copper source and silver source compounds according to the mass ratio, and dissolve them in water to form an aqueous solution. The complexing agent is dissolved in water to form an aqueous solution. The aqueous solution of ...

Embodiment 1

[0054] Taking the preparation of Cu-Ag / C in which the copper-silver alloy accounts for 80% of the total mass of the catalyst as an example, copper accounts for 10% of the total mass of the Cu-Ag alloy.

[0055] Weigh 0.171g of silver nitrate and 0.046g of copper nitrate trihydrate and stir to dissolve in 238ml of deionized water. Then 3.485g of sodium citrate dihydrate was weighed, stirred and dissolved in 66ml of deionized water, the two solutions were mixed and magnetically stirred for half an hour, 0.03g of carbon black (VXC-72) was added into it, and ultrasonically dispersed for 1h until uniform dispersion. The above precursor solution was transferred to a Erlenmeyer flask, ice bathed and magnetically stirred, the temperature was controlled at 5°C, and high-purity N 2 Protect. Weigh 0.18 g of sodium borohydride, and configure it into a 5 mmol sodium borohydride solution under ice-bath conditions. Then use a syringe pump to evenly drop it into the precursor solution at a ...

Embodiment 2

[0057] Taking the preparation of Cu-Ag / C in which the copper-silver alloy accounts for 80% of the total mass of the catalyst as an example, copper accounts for 5% of the total mass of the Cu-Ag alloy.

[0058] Weigh 0.171g of silver nitrate and 0.022g of copper nitrate trihydrate and stir to dissolve in 218ml of deionized water. Then weigh 3.209g of sodium citrate dihydrate, stir and dissolve in 60.6ml of deionized water, mix the two solutions with magnetic stirring for half an hour, add 0.029g of carbon black (VXC-72) into it, and sonicate for 1h to uniformly disperse . The above precursor solution was transferred to a Erlenmeyer flask, ice bathed and magnetically stirred, the temperature was controlled at 5°C, and high-purity N 2 Protect. Weigh 0.165 g of sodium borohydride, and configure it into a 5 mmol sodium borohydride solution under ice-bath conditions. Then use a syringe pump to evenly drop it into the precursor solution at a rate of 1ml / min until the addition is c...

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Abstract

The invention provides a catalyst for electrochemically reducing carbon dioxide into carbon monoxide and a preparation method of the catalyst. The catalyst is a carbon-support nano copper-silver alloy. According to the catalyst provided by the invention, an over-potential for electrocatalytic reduction of the carbon dioxide can be effectively reduced, and the production efficiency is improved; in addition, the catalyst has more excellent catalytic activity; the cost of the catalyst in scale production is favorably reduced. The invention also provides a preparation method of the catalyst.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a copper-silver alloy catalyst for electrochemically reducing carbon dioxide to carbon monoxide and a preparation method thereof. Background technique [0002] 80% of the energy required by human activities comes from the combustion of fossil fuels (natural gas, coal, oil, etc.), such as electricity, transportation, manufacturing, etc., which produce about one billion tons of carbon dioxide every year. Studies have shown that since the industrial revolution in 1750 to the present, the concentration of carbon dioxide in the atmosphere has increased from 280ppm in the past to 400ppm now. For example, in the past 100 years, the global temperature has increased by 0.6°C, and it is estimated that by the middle of the 21st century, the global temperature will increase by 1.5-4.5°C. The good news is that carbon dioxide can be captured on-site from fossil fuel combustion po...

Claims

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Application Information

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IPC IPC(8): B01J23/72
CPCB01J23/72
Inventor 汪秀萍康鹏
Owner BEIJING FUMEIJIA ENERGY TECH CO LTD
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