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A core-shell structure nano-copper cerium composite oxide catalyst, preparation method and application

A composite oxide, shell structure technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc.

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

AI Technical Summary

Problems solved by technology

However, the current research on core-shell catalysts still lacks the control of the geometric positional relationship and content ratio between components, as well as the in-depth study of interactions such as structure or electronic modulation.

Method used

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  • A core-shell structure nano-copper cerium composite oxide catalyst, preparation method and application
  • A core-shell structure nano-copper cerium composite oxide catalyst, preparation method and application
  • A core-shell structure nano-copper cerium composite oxide catalyst, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of Cubic Cu by Liquid Phase Reduction 2 O particles:

[0029] (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 2.0 mol / L sodium hydroxide solution was gradually dropped 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. Scanning electron microscopy of the prepared samples as figure 1 , the results show that the catalyst presents a typical Cu 2 O cubic crystal structure and smooth surface, particle edge s...

Embodiment 2

[0033] Change the calcination temperature to 300°C and 500°C, and other steps are the same as in Example 1 to obtain the catalyst CuO@CeO 2 -300 and CuO@CeO 2 -500, the morphology of the catalyst is still a nano-core-shell structure.

Embodiment 3

[0041] The catalyst NH prepared by embodiment 1 and comparative examples 1-3 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 45000h -1 , the mass of the catalyst is 0.15g. Ammonia conversion rate as Figure 2a As shown, CuO@CeO 2 The catalytic activity is the best, reaching 100% NH at 240°C 3 conversion rate, while Figure 2b , 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 discloses a core-shell structure nano-copper-cerium composite oxide catalyst, a preparation method and an application. The catalyst can be used in selective catalytic oxidation of ammonia. By adjusting the synthesis conditions of the catalyst, the local hydrolysis reaction on the surface of the copper oxide particles can be controlled, so as to achieve the purpose of regulating the formation of the outer wall of cerium oxide and the etching degree of the copper oxide particles. Finally, with CuO nanoparticles as the core, mesoporous CeO 2 CuO@CeO for the shell 2 Composite materials with core-shell structure. 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, and in particular relates to a core-shell structure nano-copper-cerium composite oxide catalyst, a preparation method and an application. Background technique [0002] Ammonia is widely used as an important raw material in the chemical industry. However, the emission of ammonia during the production process has also become an environmental problem that cannot be ignored. At present, in many ammonia treatment processes, ammonia selective catalytic oxidation (NH 3 -SCO) has been valued because of its simple process, low energy consumption, and avoidance of secondary pollution. [0003] Currently, for NH 3 The establishment of the catalytic system in -SCO mainly uses noble metals or transition metal oxides as active centers. Among them, noble metal catalysts represented by Pt, Pd, Au, Ru, and Ir have excellent low-temperature ammoxidation efficiency, but due to the low N 2 Selectivi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83B01D53/86B01D53/58
Inventor 曲振平张晓宇
Owner DALIAN UNIV OF TECH
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