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Method for preparing ethylene based on superparticles

A particle and ethylene technology, applied in the field of ethylene preparation based on superparticles, can solve the problems of low selectivity and poor stability, and achieve the effect of high ethylene selectivity

Pending Publication Date: 2021-07-09
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For multi-carbon products such as ethylene and ethanol, there are still problems such as low selectivity and poor stability. Most of the copper electrocatalysts reported so far have an ethylene Faradaic efficiency of less than 50%, and the total Faradaic efficiency of multi-carbon products is less than 70%.

Method used

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  • Method for preparing ethylene based on superparticles
  • Method for preparing ethylene based on superparticles
  • Method for preparing ethylene based on superparticles

Examples

Experimental program
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Effect test

preparation example Construction

[0044] Cu 2 Preparation of O superparticles

[0045] Add 362mg of copper nitrate trihydrate, 3g of polyvinylpyrrolidone (average molecular weight 8000) and 30ml of diethylene glycol into a 50ml three-necked flask, seal it and vacuumize it for about 15min, and then inject argon to create inertness Gas atmosphere. The solution was then heated to 190° C. with stirring using a heating mantle within 30 min and then cooled to room temperature. The product was separated by centrifugation, and washed three times with deionized water and ethanol to obtain Cu 2 O superparticles.

Embodiment 1

[0047] Step 1) Preparation of Catalyst Ink

[0048] Take 5mg Cu 2 O superparticles, 2.5 mg carbon black and 30 μL Nafion solution (5wt%) were added to 970 μl isopropanol, and then ultrasonically used for more than 30 minutes to obtain a uniform dispersion;

[0049] Step 2) preparation of working electrode

[0050] Take 10 μl of the catalyst ink in step 1), evenly drop-coat it on the surface of a glassy carbon electrode (5mm in diameter), and use an infrared lamp to dry it; figure 1 as shown, figure 1 for Cu 2 Scanning electron microscope picture of composite O superparticles and carbon black;

[0051] Step 3) Constant current pre-reduction of catalyst

[0052] The working electrode is installed in a typical three-electrode system H-type electrolytic cell. The silver-silver chloride electrode is used as the reference electrode, the platinum sheet electrode is used as the counter electrode, and the cathode and anode are separated by Nafion 117 membrane. Add 40ml of 0.1MKHC...

Embodiment 2

[0056] The specific operation steps are the same as in Example 1, except that in step 4), the constant voltage is changed to -0.85V, -0.95V, -1.05V and -1.25V (relative to the reversible hydrogen electrode) to carry out the electrocatalytic carbon dioxide reduction reaction. Correspondingly, the obtained ethylene Faradaic efficiencies were 15%, 34%, 44% and 41%, respectively. The corresponding ethylene Faradaic efficiency under more potential differences is as follows: image 3 shown.

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Abstract

The invention provides a method for preparing ethylene based on superparticles. The method comprises the following steps: electrocatalyzing carbon dioxide by using cuprous oxide superparticles by adopting a potentiostatic method to obtain ethylene. The invention also provides a method for preparing ethylene based on the superparticles, which comprises the following steps that cuprous oxide (Cu2O) superparticles are pre-cured to obtain pre-reduced Cu2O superparticles; and the pre-reduced Cu2O superparticles are subjected to electro-catalysis of carbon dioxide through a potentiostatic method, and ethylene is obtained. The cuprous oxide superparticles have very high ethylene selectivity in the electro-catalysis carbon dioxide reduction reaction, and the method has the characteristics of mild reaction conditions, cheap and easily-prepared catalyst, high ethylene selectivity and the like.

Description

technical field [0001] The invention relates to the technical fields of catalysis, electrochemistry and carbon resource conversion, in particular to a method for preparing ethylene based on superparticles. Background technique [0002] Nowadays, energy shortage and environmental pollution are two major problems that human society must solve to achieve sustainable development. Fossil energy is the main source of energy in the world today, but fossil energy is non-renewable. Its continuous burning will not only cause energy shortages, but also lead to excessive emissions of carbon dioxide. At present, the concentration of carbon dioxide in the atmosphere has exceeded the safety limit of 350ppm, and it is predicted that it will approach 600ppm by the end of this century. High levels of carbon dioxide in the atmosphere are believed to be the cause of many environmental problems, such as global warming and ocean acidification. Therefore, it is extremely urgent for the sustainab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/26C25B3/03C25B11/077
Inventor 熊宇杰江亚文王新玉龙冉马军
Owner UNIV OF SCI & TECH OF CHINA
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