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zno/cu nanocrystalline composite material and its preparation method and application

A technology of composite materials and nanocrystals, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve the problems of difficult synthesis of nanocrystalline materials, large particle size, and insufficient high-temperature stability, etc. Achieve the effect of high catalytic performance promotion and good catalytic performance

Active Publication Date: 2019-04-05
UNIV OF SCI & TECH OF CHINA
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the active nature of metallic Cu, it is difficult to synthesize nanocrystalline materials with regular shapes.
[0005] However, due to the large particle size and the stability of high-temperature catalytic performance of Cu nanocrystalline materials, there are problems such as too low activity and insufficient high-temperature stability in the water vapor shift reaction.

Method used

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  • zno/cu nanocrystalline composite material and its preparation method and application
  • zno/cu nanocrystalline composite material and its preparation method and application
  • zno/cu nanocrystalline composite material and its preparation method and application

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preparation example Construction

[0036] The present invention also provides a preparation method of the above-mentioned ZnO / Cu nanocrystalline composite material, comprising the following steps:

[0037] A) Provide Cu 2 O nanocrystals, the Cu 2 O nanocrystals are cubes or octahedrons;

[0038]B) Using zinc nitrate as a precursor, uniformly distribute zinc nitrate on Cu by equal volume impregnation 2 O nanocrystalline surface, calcined under inert atmosphere to obtain ZnO / Cu 2 O nanocrystalline composite material;

[0039] C) ZnO / Cu 2 O nanocrystalline composite material is calcined under reducing atmosphere, obtains ZnO / Cu nanocrystalline composite material; The morphology of described ZnO / Cu nanocrystalline composite material is the same as Cu 2 O nanocrystals are consistent.

[0040] The present invention uses cubic or octahedral Cu 2 O nanocrystals as raw materials.

[0041] The above cubic Cu 2 O nanocrystal is preferably prepared according to the following method as raw material:

[0042] CuCl ...

Embodiment 1

[0076] Cubic Cu 2 Synthesis of O nanocrystals

[0077]Use a 250ml three-neck flask to take 100ml of 0.01mol / l CuCl 2 Put the aqueous solution in an oil bath, keep the temperature in an oil bath at 55°C for 30 minutes, then add 10ml of 2mol / l NaOH solution and 10ml of 0.6mol / l ascorbic acid solution in sequence, and react for 5h. Finally, centrifugal washing, vacuum drying for 12h, and then cube Cu 2 O nanocrystals.

[0078] To examine its shape, see figure 1 , figure 1 is cubic Cu 2 SEM images of O nanocrystals.

Embodiment 2

[0080] Octahedral Cu 2 Synthesis of O nanocrystals

[0081] Use a 250ml three-neck flask to take 100ml of 0.01mol / l CuCl 2 The aqueous solution is placed in the oil bath, then add 4.44g PVP (M w =30000), keep the temperature in an oil bath at 55°C for 30min, then add 10ml of 2mol / l NaOH solution and 10ml of 0.6mol / l ascorbic acid solution successively, and react for 3h. Finally, centrifuge washing and vacuum drying for 12 hours, and then the octahedral Cu with PVP protective agent on the surface was obtained. 2 O nanocrystals. After that, take 150mg of octahedral Cu with PVP protectant on the surface 2 O samples were placed in a tube furnace with a fixed ratio of C 3 h 6 / O 2 / Ar mixed gas passes through the sample at a flow rate of 20ml / min, and the temperature rise rate is 5°C / min from room temperature to 200°C, then the temperature is kept at a constant temperature for 30 minutes, and then naturally lowered to room temperature, and then octahedral Cu with a clean sur...

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Abstract

The invention provides a ZnO / Cu nanometer crystal composite material. ZnO is loaded on the surface of Cu nanometer crystals; the ZnO / Cu nanometer crystal composite material is of a cube or octahedron structure. When the ZnO / Cu nanometer crystal composite material is applied to water gas conversion reaction, compared with the Cu nanometer crystals, the ZnO / Cu nanometer crystal composite material has the advantages that the high catalysis performance promoting effect is shown; meanwhile, for ZnO / Cu nanometer crystal materials with different appearances, great catalytic performance differences are also shown. Experiments show that the cube ZnO / Cu has good catalytic performance on the water gas conversion reaction.

Description

technical field [0001] The invention relates to the field of technical surface catalysis, in particular to a ZnO / Cu nanocrystalline composite material and its preparation method and application. Background technique [0002] As an inexpensive material, metallic Cu exists in large quantities in nature. At the same time, in the field of catalysis, Cu, as a variable price metal material, also has a wide range of applications. It has excellent catalytic performance in industries such as methanol synthesis, water vapor shift reaction, methanol reforming and selective oxidation reaction. Therefore, it occupies a very high position in chemical, chemical and energy production applications. [0003] Among them, the water vapor shift reaction is the industrial production of clean H 2 One of the important reactions, the data show that nearly 95% of the H 2 Reforming reactions that produce substances derived from coal, oil, natural gas, woody materials, organic waste, and biomass, ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80C01B3/16
CPCY02P20/52
Inventor 黄伟新张振华
Owner UNIV OF SCI & TECH OF CHINA
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