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Mn-ZnO catalyst as well as preparation method and application thereof

A catalyst and mass ratio technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve problems such as reduced catalytic performance, limited applications, and strong recombination capabilities of photogenerated electrons and holes

Inactive Publication Date: 2021-07-16
HUBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the wide band gap (3.3eV) of zinc oxide, the utilization rate of sunlight only accounts for 3% to 5%, and the photocatalytic process has a strong ability to recombine photogenerated electrons and holes, which reduces its catalytic performance.
[0004] In order to improve the degradation ability of zinc oxide semiconductors to methane, the existing technology mainly loads Pt, Ag, Au and other noble metals on the ZnO base, and uses the noble metals as effective traps for photogenerated electrons, so that the electrons in the conduction band of zinc oxide can be transferred to the metal. , effectively improve the separation of electrons and holes, increase the quantum yield of photons, and increase the content of free radicals on the surface, thereby enhancing the catalytic performance of ZnO catalysts to realize the photocatalytic conversion / oxidation of methane. However, the cost of noble metals is too high, which limits Application of ZnO-based photocatalyst in industrial production and life

Method used

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  • Mn-ZnO catalyst as well as preparation method and application thereof
  • Mn-ZnO catalyst as well as preparation method and application thereof

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preparation example Construction

[0026] The present invention provides the preparation method of the Mn-ZnO catalyst described in the above technical scheme, comprising the following steps:

[0027] (1) mixing zinc salt, manganese salt and water to obtain a mixed solution;

[0028] (2) mixing the mixed solution obtained in the step (1) with oxalic acid and carrying out a precipitation reaction to obtain a mixture of zinc oxalate and manganese oxalate;

[0029] (3) Annealing the mixture of zinc oxalate and manganese oxalate obtained in the step (2) to obtain a Mn-ZnO catalyst.

[0030] Unless otherwise specified, the present invention has no special limitation on the source of each component, and commercially available products well known to those skilled in the art can be used.

[0031] The invention mixes zinc salt, manganese salt and water to obtain a mixed solution.

[0032] In the present invention, the zinc salt is preferably at least one of zinc nitrate and zinc acetate, more preferably zinc acetate, ...

Embodiment 1

[0057] 0.01-Mn-ZnO catalyst: composed of ZnO and Mn doped in the ZnO, the mass ratio of Mn and ZnO is 0.01:100;

[0058] Preparation:

[0059] (1) Mix deionized water and manganese acetate tetrahydrate to obtain 0.0816mol / L manganese acetate solution, take 22.3 μL manganese acetate solution and add 2.6967g zinc acetate dihydrate (can prepare 1g ZnO) and then add 50mL deionized water, Stir for 15min at 25°C to obtain a mixed solution (the ratio of the amount of manganese acetate tetrahydrate and zinc acetate dihydrate is 0.015:100; the volume ratio of the total mass of manganese acetate tetrahydrate and zinc acetate dihydrate to deionized water is 2.7 g: 50mL; the mass of Mn in the mixed solution and the mass ratio of ZnO are 0.01:100);

[0060] (2) Under stirring conditions at 25°C, add 5.40 g of oxalic acid dihydrate to the mixed solution (the mass ratio of the total mass of manganese acetate tetrahydrate and zinc acetate dihydrate to oxalic acid dihydrate is 1:2), stir for ...

Embodiment 2

[0063] 0.03-Mn-ZnO catalyst: composed of ZnO and Mn doped in the ZnO, the mass ratio of Mn and ZnO is 0.03:100;

[0064] Preparation method: the volume of manganese acetate solution in embodiment 1 step (1) is replaced by 67 μ L, and other parameters are all identical with embodiment 1 (at this moment the ratio of the amount of substance of manganese acetate tetrahydrate and zinc acetate dihydrate is 0.045: 100; the volume ratio of the total mass of manganese acetate tetrahydrate and zinc acetate dihydrate to deionized water is 2.7g:50mL; the mass ratio of Mn and ZnO in the mixed solution is 0.03:100), to obtain 0.03-Mn-ZnO catalyst powder.

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Abstract

The invention relates to the technical field of catalysts, and provides a Mn-ZnO catalyst which comprises ZnO and Mn doped in the ZnO. The mass ratio of Mn to ZnO in the Mn-ZnO catalyst is (0.001 to 10): 100. Mn is used as a doping metal, so that the lattice structure in ZnO is effectively changed, the photocatalyst can absorb sunlight to generate electron and hole pairs, electrons and holes are rapidly separated and migrated to the surface of a Mn-ZnO semiconductor, recombination of photon-generated carriers is inhibited, and therefore, the service life of the photo-gnerated electron-hole pair participating in the photocatalytic reaction is prolonged; and the electrons and holes migrated to the surface of the Mn-ZnO semiconductor and CH4 adsorbed on the surface of Mn-ZnO are subjected to a redox reaction, so that the photocatalytic efficiency is improved. Experimental results show that the Mn-ZnO catalyst provided by the invention can efficiently catalyze and degrade methane under simulated sunlight.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a Mn-ZnO catalyst and its preparation method and application. Background technique [0002] Methane is a colorless and odorless gas at normal temperature and pressure, and is a typical non-polar molecule. The C-H bond energy in methane is as high as 434KJ / mol. Therefore, methane is extremely stable at room temperature and difficult to activate and degrade. [0003] Semiconductor photocatalysis technology can not only completely oxidize and decompose a large number of stable substances without forming secondary pollutants, but also has the advantages of environmental protection, so semiconductor photocatalysis technology is widely used in catalytic degradation of methane. Among them, zinc oxide is often used as a semiconductor photocatalyst material because of its excellent photocatalytic performance, good chemical stability, safety, non-toxicity, and low cost. However, due to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01D53/86B01D53/72
CPCB01J23/34B01D53/864B01J35/39
Inventor 陈绪兴苏扬航高云李荣徐欣悦董远鹏
Owner HUBEI UNIV
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