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IrCu/TiO2 nanosheet catalyst as well as preparation method and application thereof

A catalyst and nanosheet technology, applied in the field of IrCu/TiO2 nanosheet catalyst and its preparation, can solve the problem of low doping selectivity of pure metal, and achieve the effects of improving light absorption, excellent CH4 selectivity, and suppressing side reactions

Active Publication Date: 2021-08-17
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure metal doping due to the total yield and CH 4 limited by low selectivity

Method used

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  • IrCu/TiO2 nanosheet catalyst as well as preparation method and application thereof
  • IrCu/TiO2 nanosheet catalyst as well as preparation method and application thereof
  • IrCu/TiO2 nanosheet catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of IrCu / TiO 2 The preparation method of nano sheet catalyst comprises the following steps:

[0028] (1) TiO 2 Preparation of Nanosheet Catalysts

[0029] Accurately weigh 20ml of tetrabutyl titanate into the polytetrafluoroethylene liner, start stirring, and then add 2.4ml of hydrofluoric acid solution with a mass fraction of 5% to it dropwise during the stirring process. Stirring was continued for 1 h. After packaging in a high-pressure reactor, put it in a constant temperature electric blast drying oven at 200°C for 24 hours, and collect the blue-white precipitated TiO 2 NS, washed alternately with ethanol and distilled water until the precipitate is pure white, dried at 110°C for 24h, and calcined at 400°C for 2h in a muffle furnace, and the sample obtained is designated as TiO 2 NS.

[0030] (2) Preparation of IrCu alloy nanoparticles, figure 1 Schematic diagram of the reaction device prepared for IrCu alloy particles:

[0031] Put 15ml of ethylene g...

Embodiment 2

[0037] IrCu / TiO 2 (NS) photocatalytic CO 2 Determination of reduction catalytic performance

[0038] The prepared IrCu / TiO 2 (NS) catalyst applied to photocatalytic CO 2 Reduction catalytic reaction, the specific steps of activity evaluation are as follows:

[0039] (1) Mix 20 mg of the catalyst sample with 5 ml of deionized water and place it in a polytetrafluoroethylene reactor, add a stirrer, and sonicate for 20 minutes to ensure that the sample is evenly dispersed;

[0040] (2) Use the flange to seal the reactor, and open the stirrer and digital display temperature control in the base;

[0041] (3) Use a partial pressure valve to convert pure CO 2 Introduce into the reactor, a total of 0.1Mpa, inflate and deflate a total of 5 times to ensure that the reactor is pure CO 2 atmosphere;

[0042] (4) At the same time, open the nitrogen and air cylinders, open the hydrogen generator, open the chromatographic instrument and the corresponding software on the computer; adjus...

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Abstract

The invention discloses an IrCu / TiO2 nanosheet catalyst as well as a preparation method and application thereof, and belongs to the technical field of CO2 photocatalytic reduction. The method comprises the following steps: dissolving iridium chloride and copper nitrate into ethylene glycol, and preparing IrCu alloy by a microwave-assisted method; and dissolving the IrCu alloy in ethanol, dropwise adding the IrCu alloy into a TiO2 nanosheet ethanol solution in a dipping manner, drying by distillation in a water bath, drying and grinding to obtain the IrCu / TiO2 nanosheet catalyst. The catalyst shows extremely excellent activity and CH4 selectivity in a CO2 photocatalytic reduction reaction.

Description

technical field [0001] The invention belongs to CO 2 Photocatalytic reduction technical field, specifically relate to a kind of IrCu / TiO 2 Nanosheet catalyst and its preparation method and application. Background technique [0002] With industrialization and the burning of fossil fuels, the concentration of carbon dioxide in the atmosphere is getting higher and higher, reaching 417ppm in May 2019, which has led to an urgent desire for renewable clean energy and control of carbon emissions. As we all know, carbon dioxide is a common greenhouse gas, and its atmospheric concentration is closely related to long-term climate changes such as glacier melting, sea level rise, ocean acidification and Antarctic continental shelf collapse. Therefore, to expand the use of renewable energy solar energy and reduce the greenhouse gas CO 2 Emissions as the goal, the development of efficient CO2 that converts solar energy into chemical energy 2 Photocatalysts are of great significance. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/16C07C1/12C07C9/04
CPCB01J23/8926B01J37/16C07C1/12C07C2523/89B01J35/23B01J35/39C07C9/04Y02P20/52
Inventor 万海勤唐坤林邹伟欣董林吴聪张立新须亚洁
Owner NANJING UNIV
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