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Photocatalyst for CO2 reduction and preparation method thereof

A photocatalyst and catalyst technology, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, carbon monoxide, etc., can solve the problems of large impact on profit and income, secondary leakage, high cost, etc., and achieve improved photocatalytic activity and stability Effect

Active Publication Date: 2020-12-15
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CO 2 Capture technology solutions generally have disadvantages such as high cost, and the profit income is greatly affected by local policies, and the post-capture CO 2 The degree of utilization also becomes a necessary consideration for the entire capture project
Currently, large-scale CO 2 Storage in the ground is still the main treatment method, but there is CO 2 Hazards such as secondary leakage and damage to geological structures

Method used

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  • Photocatalyst for CO2 reduction and preparation method thereof
  • Photocatalyst for CO2 reduction and preparation method thereof
  • Photocatalyst for CO2 reduction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: composite catalyst TiC-TiO 2 / g -C 3 N 4 method of preparation. 0.25g g-C 3 N 4Disperse in a beaker filled with 30 mL of deionized water, weigh 25 mg of TiC and put it into the above mixed solution, and perform ultrasonic treatment for 10 min and stirring for 10 min, wherein the stirring speed is 1000 rad / min, and then transfer the mixed solution to a water bath, and Evaporate to dryness in a water bath at 80°C with a rotation speed of 500 rad / min. After evaporating to dryness, the remaining solid was taken out and ground, and then placed in a muffle furnace for calcination. The calcination temperature was 450°C, the heating rate was 5°C / min, and the calcination time was 3h, so that TiC was partially oxidized to TiO 2 , the obtained sample is recorded as 450-(25)TiC-TiO 2 / g -C 3 N 4 . attached figure 1 Represents 450-(25)TiC-TiO 2 / g -C 3 N 4 A schematic diagram of the preparation process.

Embodiment 2

[0041] Embodiment 2: preparation method is the same as embodiment 1, and its difference is that in the preparation process of catalyst, directly to g-C 3 N 4 Add 10mg TiC and 15mg TiO to the mixture 2 Nanoparticles (5–7nm) in tube furnaceN 2 Calcined at 550°C for 3 hours in the atmosphere, the heating rate was 5°C / min, TiC was not oxidized, and the obtained sample was recorded as 450-TiC / TiO 2 / g -C 3 N 4 .

Embodiment 3

[0042] Example 3: The preparation method is the same as in Example 1, the difference is that during the preparation of the catalyst, the calcination temperature in the muffle furnace is 400 ° C, and the obtained sample is recorded as 400-(25)TiC-TiO 2 / g -C 3 N 4 .

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Abstract

The invention discloses a photocatalyst for CO2 reduction and preparation method thereof. The photocatalyst disclosed by the invention is prepared by compounding g-C3N4 and transition metal carbide, calcining at a high temperature and partially oxidizing, and has a Z-shaped carrier transport characteristic, the formed Z-shaped heterojunction reduces the hole electron recombination rate, an oxidation reaction and a reduction reaction on the catalyst are separated, and the photocatalytic activity of the photocatalyst is improved. Therefore, the photocatalytic CO2 reduction efficiency and stability are improved. The specific surface area of the catalyst is large, the photo-thermal effect caused by high light absorption intensity of the catalyst enables the photocatalytic activity to be improved, products such as CO are easy to desorb on the surface of the catalyst, reuse of active sites is facilitated, and the stability of the photocatalyst is enhanced. The catalyst has a good applicationprospect in the field of photocatalytic CO2 reduction, the raw materials are cheap, the preparation method and operation are simple, and the catalyst is suitable for large-scale production.

Description

technical field [0001] The invention belongs to photocatalytic CO 2 Utilization field, specifically related to a CO 2 Reduced photocatalyst and method for its preparation. [0002] technical background [0003] CO 2 Capture and utilization has always been a hot topic in human research. CO 2 It is the culprit that causes the global warming effect, and as a C source, it can become a raw material for many energy reactions. Therefore, for CO 2 It is captured and then utilized as a resource to prepare a high-energy fuel substance, which has a very high research value. [0004] Currently CO 2 There are three main technical solutions for the capture of CO2, namely pre-combustion capture, oxygen-enriched combustion, and post-combustion capture. These three methods are currently becoming mature. Globally, CO 2 Capture items and capture capabilities grow rapidly. However, CO 2 Capture technology solutions generally have disadvantages such as high cost, and the profit income is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J27/22B01J35/10B01D53/86B01D53/62C01B32/40
CPCB01J27/24B01J27/22B01D53/8671C01B32/40B01D2257/504B01J35/61B01J35/39Y02C20/20
Inventor 罗潇李子怡陈明梁志武
Owner HUNAN UNIV
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