A single component dual active site cu 2 O-cuo nano-mixed structure copper oxide catalyst, preparation method and application

A copper oxide, dual-active technology, applied in the field of catalytic materials, can solve the problems of unfavorable synthesis, complex catalytic system and high reaction temperature

Active Publication Date: 2021-08-20
DALIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem of the present invention is to overcome the existing complex catalytic system, which is not conducive to synthesis, and the disadvantages of high reaction temperature, and provide a single-component dual-active-site Cu catalyst for ammonia catalytic oxidation reaction. 2 O-CuO nano-mixed structure copper oxide catalyst, by adjusting the catalyst pretreatment conditions, the control of the surface reconstruction process of cuprous particles is realized, so as to achieve the purpose of regulating the formation of the outer wall of copper oxide on the surface

Method used

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  • A single component dual active site cu <sub>2</sub> O-cuo nano-mixed structure copper oxide catalyst, preparation method and application
  • A single component dual active site cu <sub>2</sub> O-cuo nano-mixed structure copper oxide catalyst, preparation method and application
  • A single component dual active site cu <sub>2</sub> O-cuo nano-mixed structure copper oxide catalyst, preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Preparation of Cubic Cu by Liquid Phase Reduction 2 O particles:

[0030] (1) Firstly, copper nitrate was dissolved in 900ml of deionized water to prepare a solution with a concentration of 0.01mol / L. At the same time, 0.09g of citric acid particles were added to the solution, and stirred at room temperature for 0.5h. Then gradually drop 2.0 mol / L sodium hydroxide solution into the mixed solution until pH=11. After stirring at room temperature for another 0.5 h, 0.6 mol / L ascorbic acid solution was added to the solution, at this time, the mixture was heated to 40° C. and kept constant, and stirring was continued for 3 h. Cu obtained by centrifugation 2 O samples were cleaned with deionized water and alcohol. Finally, the catalyst was dried in a vacuum environment for 12 h. The scanning electron microscope of the prepared sample is shown in Figure 1, and the results show that the catalyst presents a typical Cu 2 O cubic crystal structure and smooth surface, particle...

Embodiment 2

[0034] Change the pretreatment temperature to 225 ° C and 275 ° C, and other steps are the same as in Example 1 to obtain the catalyst Cu 2 O-CuO-B and Cu 2 O-CuO-C, the catalyst is still Cu 2 O-CuO mixed structure.

Embodiment 3

[0040] The catalyst prepared by embodiment 1,2 and comparative example 1,2 is to NH 3 Catalytic oxidation performance test is carried out in continuous operation on a fixed-bed reactor, He is used as balance gas, and NH 3 Analyzer and gas chromatograph on-line analysis of gaseous substance NH after reaction 3 Molecule and Product N 2 molecular. The specific reaction conditions are: 1000ppm NH 3 , 10vol%O 2 , He is used as the balance gas, and the reaction space velocity is 50000h -1 , the mass of the catalyst is 0.15g. Ammonia conversion rate as Figure 1a Shown, Cu 2 O-CuO-A has the best catalytic activity, reaching 100% NH at 210 °C 3 conversion rate, while Figure 1b , N 2 The selectivity reaches more than 90% in the reaction temperature range.

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Abstract

The invention belongs to the technical field of catalytic materials and provides a single-component dual-active-site Cu 2 O-CuO nano-mixed structure copper oxide catalyst, preparation method and application. The catalyst can be used in selective catalytic oxidation of ammonia. By adjusting the pretreatment conditions of the catalyst, the control of the surface reconstruction process of the cuprous particles is realized, so as to achieve the purpose of regulating the formation of the outer wall of copper oxide on the surface. Finally get Cu 2 The O nanoparticles are the core, and the Cu with a CuO shell on the outside 2 O‑CuO nano-mixed phase structure composite copper oxide material. The catalyst has excellent ammonia oxidation activity and N 2 Selectivity, and good reaction stability. The preparation method is simple, efficient and reliable, the raw materials are readily available, and the preparation is easy in large quantities.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, in particular to a single-component dual-active-site Cu 2 O-CuO nano-mixed structure copper oxide catalyst, preparation method and application. Background technique [0002] In recent years, heterogeneous catalytic technology has been widely concerned in the application of pollutant gas emissions due to its characteristics of rapidity, high efficiency, energy saving, and simple process. Among them, ammonia selective catalytic oxidation (NH 3 -SCO) has become an important research object as an important process link to effectively remove excess ammonia. [0003] In consideration of practical applications, currently for NH 3 -The research on the catalytic system in SCO mainly focuses on transition metal oxide catalysts, such as Cu, Mn, Fe, Co, etc. Among them, the Cu oxides in ammonia conversion and N 2 The performance in terms of generation is particularly outstanding, and it is c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/72B01D53/86B01D53/58
Inventor 曲振平张晓宇
Owner DALIAN UNIV OF TECH
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