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Catalyst for electrochemical reduction of carbon dioxide and preparation method of catalyst

A carbon dioxide and catalyst technology, applied in the field of electrochemical carbon dioxide reduction catalyst and its preparation, can solve the problems of complex catalyst structure control, low conversion current efficiency, unfavorable catalyst scale, etc., and achieve good CO2 electroreduction catalytic activity and CO2 conversion The effect of high efficiency and good process scale-up ability

Active Publication Date: 2017-10-17
BEIJING FUMEIJIA ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This multi-coating deposition preparation method increases the effective active sites of the catalyst to a certain extent, but the electrolysis voltage is high and the CO 2 The problem of low conversion current efficiency has not been greatly improved, and there are still problems such as high catalyst cost and complicated preparation.
Chinese patent 2016010104675.X has prepared nano-SnO catalysts with special morphology by means of deposition and electroplating. 2 The production of formic acid has high catalytic activity and current efficiency, however, the control of the catalyst structure is complex and the preparation process is cumbersome, which is not conducive to the large-scale synthesis of the catalyst

Method used

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  • Catalyst for electrochemical reduction of carbon dioxide and preparation method of catalyst
  • Catalyst for electrochemical reduction of carbon dioxide and preparation method of catalyst
  • Catalyst for electrochemical reduction of carbon dioxide and preparation method of catalyst

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preparation example Construction

[0022] Carbon supported nano Ag x Zn y o z (0<x<1, 0<y<1, x+y=1, z≤2x+y) catalyst preparation method, comprising the following steps: S1: weighing soluble zinc source compound and silver source compound by molar ratio, The zinc source compound and the silver source compound are dissolved in deionized water to prepare a precursor solution. S2: adding the carbon support to the precursor solution and dispersing evenly. S3: Prepare a strong base solution and add it to the carbon black / precursor solution. After the reaction is completed, filter to separate solid particles, wash, dry, grind, and finally roast to obtain the catalyst.

[0023] Wherein the soluble zinc source compound may be zinc chloride, zinc sulfate, zinc nitrate, zinc acetate and the like. The soluble silver source compound may be silver nitrate or the like. Substances that can be used as carbon supports include carbon black, acetylene black, Ketjen black, carbon nanofibers, carbon nanotubes, and the like. Th...

Embodiment 1

[0028] According to zinc element and silver element molar ratio is 85:15 scale removes zinc nitric acid and silver nitrate. 5.1 g of zinc nitrate hexahydrate and 0.5 g of silver nitrate were stirred and dissolved in 200 mL of deionized water to prepare a precursor solution. Add 0.4g of carbon black (XC-72) to the precursor solution, and sonicate for 10min until uniformly dispersed. Weigh 1.8g of sodium hydroxide and make 1mol L -1 Sodium hydroxide solution, with a syringe pump at 1mL·min -1Added dropwise into the precursor solution containing carbon black at a speed of Keep the reaction temperature at about 25°C, and magnetically stir the precursor solution during the dropwise addition. During the dropwise addition, the pH value of the reaction system was monitored with a pH meter, and the pH was kept increasing slowly. Continue stirring for 3h after the dropwise addition. Then use a vacuum filter to separate the solid particles, wash them three times with deionized water...

Embodiment 2

[0030] Except that the zinc nitrate and the silver nitrate that take zinc element and silver element molar ratio are 99:1 by weighing, other conditions are identical with embodiment 1. The obtained product catalyst is Zn 0.99 Ag 0.01 o z / C

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Abstract

The invention provides a catalyst for electrochemical reduction of carbon dioxide. The catalyst is a carbon-loaded nano AgxZnyOz or AgxZny alloy, wherein x is greater than 0 and less than 1, y is greater than 0 and less than 1, x+y is equal to 1, and z is less than or equal to 2x+y. The invention further provides a preparation method of the catalyst. The particle sizes of two catalyst active components of the catalyst reach a nano level, thus ensuring that the catalyst has multiple active sites and a relatively large current density. The catalyst provided by the invention is high in CO2 electric reduction catalytic activity, low in decomposition voltage and high in CO2 conversion efficiency. Two preparation methods of the catalyst are high in process amplification capability and comprise core steps of double decomposition and precipitation or impregnation and calcinations which are easy to control.

Description

technical field [0001] The invention relates to the field of electrochemical reduction, in particular to a catalyst for electrochemical reduction of carbon dioxide and a preparation method thereof. Background technique [0002] The widespread use of fossil fuels not only consumes a lot of energy and brings energy problems, but also produces a lot of CO 2 If it is discharged directly, it will bring serious environmental problems. CO on the other hand 2 It is also a rich carbon source, if the CO 2 Transforming into useful substances is a solution to related energy and environmental problems. CO 2 is a stable compound that realizes CO by an electrochemical reduction method 2 The conversion of is an effective way, but its conversion effect largely depends on the CO 2 Properties of electroreduction catalysts and their preparation methods. [0003] The more studied CO 2 Electroreduction catalysts include Cu, Ag, Au, In, Sn, Pb, and Zn, among others. Chinese patent 2011100...

Claims

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Application Information

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IPC IPC(8): B01J35/02B01J23/66C25B1/00C25B11/06
CPCC25B1/00B01J23/002B01J23/66C25B11/075B01J35/40
Inventor 赵鹏鹃张红飞康鹏
Owner BEIJING FUMEIJIA ENERGY TECH CO LTD
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