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Method for preparing methane and ethylene through carbon dioxide electrochemical reduction

A carbon dioxide and electrochemical technology, applied in the direction of electrodes, electrolytic processes, electrolytic components, etc., can solve the problem of scarcity of catalytic materials, achieve the effects of inhibiting hydrogen evolution reaction, increasing contact area, improving Faraday efficiency and current efficiency

Active Publication Date: 2018-09-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, at present, the products of electrochemical reduction of carbon dioxide are mainly carbon monoxide, formic acid, methanol, etc., and the catalytic materials for converting carbon dioxide into hydrocarbons with high energy density (such as methane, ethylene, ethane, etc.) are still very scarce.

Method used

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  • Method for preparing methane and ethylene through carbon dioxide electrochemical reduction
  • Method for preparing methane and ethylene through carbon dioxide electrochemical reduction
  • Method for preparing methane and ethylene through carbon dioxide electrochemical reduction

Examples

Experimental program
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Embodiment 1

[0042] Embodiment 1: catalyst preparation

[0043] Weigh 10g of urea and 1g of anhydrous copper acetate, mix urea and anhydrous copper acetate evenly and physically to obtain a catalyst precursor, place the catalyst precursor in a 30mL crucible with a lid, and place it in a muffle furnace for pyrolysis Reaction, the reaction temperature is 400°C, the heating rate is 5°C / min, and the reaction time is 2h. The obtained solid is ground to obtain graphite-phase carbon nitride-supported nano-copper oxide, which is the carbon dioxide electrochemical reduction catalyst, called Cu x O@C 3 N 4 -400°C catalyst.

Embodiment 2

[0044] Embodiment 2: catalyst preparation

[0045] The specific preparation process is as shown in Example 1. Only by changing the reaction temperature to 450°C, the graphite-phase carbon nitride-supported nano-copper oxide can also be obtained, which is called Cu x O@C 3 N 4 -450°C catalyst. For Cu in Example 2 x O@C 3 N 4 XRD characterization of the catalyst at -450°C, such as figure 1 As shown, it can be seen that the catalyst includes graphite phase carbon nitride and nano-copper oxides in two crystal forms of cupolite and cuprite.

Embodiment 3

[0046] Embodiment 3: catalyst preparation

[0047] The specific preparation process is as shown in Example 1. Only by changing the reaction temperature to 500 ° C, can also obtain graphite-phase carbon nitride-supported nano-copper oxide, called Cu x O@C 3 N 4 -500°C catalyst. For Cu in Example 3 x O@C 3 N 4 XRD characterization of the catalyst at -500°C, such as figure 1 As shown, it can be seen that the catalyst includes graphite phase carbon nitride and nano-copper oxides in two crystal forms of cupolite and cuprite.

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Abstract

The invention relates to a method for preparing methane and ethylene through carbon dioxide electrochemical reduction. The method comprises the steps that an H-shaped dual-electrochemical-cell reactoris adopted, and is isolated into a cathode chamber and an anode chamber through a proton exchange membrane; before the reaction, carbon dioxide gas is led into the cathode chamber; a three-electrodesystem is adopted, a gas diffusion electrode serves as a work electrode, a platinum electrode serves as an auxiliary electrode, and a silver / silver chloride electrode serves as a reference electrode;the gas diffusion electrode comprises a gas diffusion electrode body and a carbon dioxide electrochemical reduction catalyst loaded gas diffusion electrode body; the carbon dioxide electrochemical reduction catalyst is graphite phase nitrogenated carbon supported nanometer copper oxide, and the nanometer copper oxide has tenorite and red copper ore. Through the method, the faradic efficiency of carbureted hydrogen of methane, ethylene and the like can be improved.

Description

technical field [0001] The invention relates to the technology of electrochemically reducing carbon dioxide, in particular to a method for preparing methane and ethylene by electrochemically reducing carbon dioxide. Background technique [0002] At present, about 80% of the energy needed in the world is obtained by burning fossil fuels, and the combustion process causes the world to emit about 34 billion tons of CO into the atmosphere every year. 2 . Due to CO 2 The thermal power is very low, it is difficult to be reduced to a renewable product, making most of the CO 2 Exhausted as waste gas, for example a lignite power station can produce a total of 50,000 tons of CO per day 2 . In addition CO 2 Belonging to greenhouse gases, it causes global warming, ocean acidification, and soil desertification, causing great negative effects on the environment. [0003] CO 2 The conversion is to reduce CO 2 One of the effective measures of displacement. It can be mainly carried ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/04C25B1/02C25B11/06C25B3/25
CPCC25B1/02C25B3/25C25B11/055C25B11/051C25B11/091
Inventor 傅杰黎梓浩吕秀阳欧阳平凯
Owner ZHEJIANG UNIV
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