Catalyst for preparing formic acid through electrochemical reduction of carbon dioxide and preparation method thereof

A carbon dioxide and catalyst technology, applied in the field of catalysts, can solve the problems that the catalyst performance needs to be further improved, the catalyst stability is poor, etc., and achieve the effects of high activity and good formic acid selectivity.

Active Publication Date: 2020-04-03
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of the tin dioxide catalyst is poor, and the performance of the catalyst needs to be further improved.

Method used

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  • Catalyst for preparing formic acid through electrochemical reduction of carbon dioxide and preparation method thereof
  • Catalyst for preparing formic acid through electrochemical reduction of carbon dioxide and preparation method thereof
  • Catalyst for preparing formic acid through electrochemical reduction of carbon dioxide and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Take a certain amount of copper nitrate dissolved in deionized water to obtain solution A, dissolve a certain amount of BTC in ethanol to obtain B, add A dropwise to B, transfer it to a 100ml reaction kettle, crystallize at 110°C for 8 hours, and cool The product was suction-filtered at lower temperature, washed with 50% ethanol aqueous solution, and dried at 40° C. to prepare Cu-BTC.

[0039] The stannous oxalate is fully mixed with the prepared Cu-BTC according to a certain ratio (wherein the mass of Cu-BTC is 30%). Then put it in a muffle furnace from room temperature to 600°C at a heating rate of 20°C / min, calcining for 8 hours, and then slowly lowering to room temperature to obtain Sn 0.3 Cu 0.7 O catalyst, the catalyst SEM picture is attached figure 1 shown.

[0040] The prepared catalyst was subjected to constant potential electrolytic reduction at a voltage of -1.7V, the Faraday efficiency was 59.2%, and the current density was 82.4mA / cm 2 .

Embodiment 2

[0042] Dissolve a certain amount of copper nitrate in deionized water to obtain solution A, dissolve a certain amount of BTC in ethanol to obtain B, add dropwise A to B, transfer it to a 100ml reaction kettle, crystallize at 170°C for 24 hours, and cool The product was suction-filtered at lower temperature, washed with 50% ethanol aqueous solution, and dried at 80° C. to prepare Cu-BTC.

[0043]The stannous oxalate is fully mixed with the prepared Cu-BTC according to a certain ratio (the mass of Cu-BTC is 70%). Then put it in a muffle furnace from room temperature to 500°C at a heating rate of 10°C / min, calcined for 2 hours, and then slowly lowered to room temperature to obtain Sn 0.7 Cu 0.3 O catalyst, the catalyst SEM picture is attached figure 2 shown.

[0044] The prepared catalyst was subjected to constant potential electrolytic reduction at a voltage of 2.3V, the Faraday efficiency was 34.7%, and the current density was 59.4mA / cm 2 .

Embodiment 3

[0046] Dissolve a certain amount of copper nitrate in deionized water to obtain solution A, dissolve a certain amount of BTC in ethanol to obtain B, add A dropwise to B, transfer it to a 100ml reaction kettle, crystallize at 200°C for 14 hours, and cool The product was suction-filtered at lower temperature, washed with 50% ethanol aqueous solution, and dried at 40° C. to prepare Cu-BTC.

[0047] The stannous oxalate is fully mixed with the prepared Cu-BTC according to a certain ratio (wherein the mass of Cu-BTC is 50%). Then put it in a muffle furnace from room temperature to 450 ° C, the heating rate is 8 ° C / min, calcined for 5 hours, and then slowly lowered to room temperature, that is, Sn 0.5 Cu 0.5 O catalyst, the catalyst SEM picture is attached image 3 shown.

[0048] The prepared catalyst was subjected to constant potential electrolytic reduction at a voltage of 4V, the Faraday efficiency was 19.1%, and the current density was 78.3mA / cm 2 .

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Abstract

The invention discloses a catalyst for preparing formic acid through electrochemical reduction of carbon dioxide and a preparation method thereof. The chemical formula of the catalyst is Sn<x>Cu<y>O,wherein the sum of x and y is equal to 1, and x is greater than 0. The catalyst is prepared by mixing and calcining a Cu-BTC precursor and stannous oxalate. The prepared catalyst is applied to carboncloth to form a catalytic carbon cloth electrode, the catalytic carbon cloth electrode forms a three-electrode working system with an Ag / AgCl saturated electrode and a platinum electrode, and constant-potential electrochemical reduction is conducted on carbon dioxide under the voltage of -2.5V to 5V to prepare formic acid. The catalyst has the advantages of high catalyst activity, good formic acidselectivity and the like.

Description

technical field [0001] The invention relates to a catalyst for preparing formic acid by electrochemical reduction of carbon dioxide and a preparation method thereof, belonging to the technical field of catalysts. Background technique [0002] Renewable energy, especially wind energy and solar energy, has strong randomness, intermittency, volatility, and anti-peaking characteristics, and there are dislocation contradictions between the distribution of high-quality wind energy and solar energy resources in my country and the distribution of electricity loads. Difficult to digest in situ, high permeability. As a result, a large number of wind power and photovoltaics cannot be connected to the grid due to the large impact on the power grid, resulting in a great waste of wind and light resources. [0003] CO 2 It is the main greenhouse gas, and it is also a non-toxic and cheap C1 resource. Its fixed utilization has important theoretical and practical significance for the develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/835C25B3/04C25B11/06C25B3/25
CPCB01J23/002B01J23/835B01J35/0033C25B3/25C25B11/091Y02P20/133
Inventor 吴晋沪刘广波郭祥贺李冰爽谭猗生解红娟武景丽訾仲岳
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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