Catalyst for producing ethylene through photocatalytic reduction of carbon dioxide and preparation method of catalyst

A carbon dioxide and catalyst technology, which is applied in the field of photocatalytic reduction of carbon dioxide to ethylene and its preparation, can solve the problems of low electron transfer efficiency, difficult conversion, slow kinetics, etc., to improve reaction efficiency and selectivity, increase activity and The effect of stability

Active Publication Date: 2021-11-12
ZHEJIANG SCI-TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although some copper-based catalysts have been reported for the electrochemical reduction of CO 2 CO can be incorporated into 2 into ethylene, but even if there is a Cu catalytic center in the photocatalytic reaction system, the CO 2 There are still great difficulties in converting to ethy...

Method used

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  • Catalyst for producing ethylene through photocatalytic reduction of carbon dioxide and preparation method of catalyst
  • Catalyst for producing ethylene through photocatalytic reduction of carbon dioxide and preparation method of catalyst
  • Catalyst for producing ethylene through photocatalytic reduction of carbon dioxide and preparation method of catalyst

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preparation example Construction

[0035] The preparation method of described catalyst comprises the steps:

[0036] 1) Weigh 2-aminoterephthalic acid and tetraisopropyl titanate according to the ratio of substances to 2:1, dissolve them in N,N-dimethylformamide and methanol and mix them at a volume ratio of 1:1 to form in a mixed solvent, then transfer the solution to a hydrothermal reactor, react at 150°C for 10-15h, cool to room temperature after the reaction, collect the precipitate, wash and dry it to obtain MIL-125-NH 2 Powder; MIL-125-NH 2 The particle size of the powder is 100-300nm.

[0037] 2) Weighing MIL-125-NH 2 Powder evenly dispersed in water, MIL-125-NH 2 The mass ratio of powder and water is 1-4:200; get MIL-125-NH 2 Suspension A of the suspension A; measure the copper salt aqueous solution with a concentration of 0.1mol / L, add it to the above suspension A, and stir for 10-60min to obtain the suspension B; measure the cerium salt with a concentration of 0.1mol / L Add the aqueous solution to...

Embodiment 1

[0043] (1) Weigh 0.628g of 2-aminoterephthalic acid and 0.531mL of isopropyl titanate and dissolve them in 30mL of DMF and methanol (1:1 by volume) mixed solvent, then transfer the solution to the reaction kettle , kept at 150°C for 15h, cooled to room temperature, collected the precipitate, washed and dried to obtain MIL-125-NH 2 Powder;

[0044] (2) Weigh 0.2g MIL-125-NH 2 The powder is uniformly dispersed in 20mL deionized water by ultrasonic to form suspension A;

[0045] (3) Measure 0.05 mL of an aqueous solution of copper salt with a concentration of 0.1 mol / L, add it to the suspension A above, and stir for 30 minutes to obtain a suspension B;

[0046] (4) Measure 1 mL of a solution of cerium brine with a concentration of 0.1 mol / L, add it to the above-mentioned suspension solution B, and continue stirring for 8 hours to obtain a suspension C;

[0047] (5) Centrifuge the suspension C at 8000r / min for 5min by high-speed centrifugation, separate the solid particles from...

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Abstract

The invention belongs to the technical field of catalytic materials and preparation thereof, and particularly relates to a catalyst for producing ethylene through photocatalytic reduction of carbon dioxide and a preparation method of the catalyst, and the catalyst is formed by loading atomic-scale dispersed Cu on the surface of a CeO2-TiO2 heterostructure; the preparation method comprises the following steps: impregnating and adsorbing a proper amount of Ce 3+ and Cu2+ by using MIL-125-NH2, and performing pyrolyzing in air at a certain temperature. In the catalyst, TiO2 generates electron-hole pairs under optical excitation, the separation efficiency of the photo-generated electron-hole pairs is improved by a CeO2-TiO2 heterostructure, and multiple active sites of Cu and Ce on the surface of the catalyst are beneficial to formation and stabilization of CO intermediates and promote formation of COCO dimers, so that the efficiency and selectivity of generating C2H4 through photocatalytic reduction of CO2 are remarkably improved. The preparation method of the catalyst is simple and easy to implement, and the catalyst has wide application prospects in the aspects of preparing high-added-value chemicals through catalytic conversion of greenhouse gas CO2, efficiently utilizing solar energy and the like.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials and their preparation, and in particular relates to a catalyst for photocatalytic reduction of carbon dioxide to generate ethylene and a preparation method thereof. Background technique [0002] With the continuous development of industrialization of human society, the excessive use of fossil fuels emits a large amount of carbon dioxide (CO 2 ) gases, causing the greenhouse effect and leading to a rapid rise in global temperature. In response to climate change, countries around the world have adopted a global agreement to reduce greenhouse gas emissions. my country has also proposed the important goal of "strive to peak carbon dioxide emissions before 2030 and strive to achieve carbon neutrality before 2060". "Artificial photosynthesis" through photocatalytic technology can use solar energy to convert CO 2 Conversion into fuel or industrial raw material is to reduce CO in the atmosph...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J35/10C07C1/02C07C11/04
CPCB01J23/83B01J23/002B01J35/004B01J35/0013B01J35/10C07C1/02C07C2523/83C07C11/04Y02P20/52
Inventor 李本侠王挺
Owner ZHEJIANG SCI-TECH UNIV
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