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Ternary NiO nanosheet@bimetallic CeCuOx microchip core-shell structure composite material as well as preparation and application of ternary NiO nanosheet@bimetallic CeCuOx microchip core-shell structure composite material

A technology of core-shell structure and composite materials, applied in metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, heterogeneous catalyst chemical elements, etc., can solve poor thermal stability, high cost, high surface area Easy to agglomerate and other problems, to achieve the effect of increasing oxygen vacancies and contact area, uniform pore size, and controllable structure

Active Publication Date: 2021-03-09
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has the disadvantages of poor thermal stability and high cost, high surface energy and easy agglomeration

Method used

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  • Ternary NiO nanosheet@bimetallic CeCuOx microchip core-shell structure composite material as well as preparation and application of ternary NiO nanosheet@bimetallic CeCuOx microchip core-shell structure composite material
  • Ternary NiO nanosheet@bimetallic CeCuOx microchip core-shell structure composite material as well as preparation and application of ternary NiO nanosheet@bimetallic CeCuOx microchip core-shell structure composite material
  • Ternary NiO nanosheet@bimetallic CeCuOx microchip core-shell structure composite material as well as preparation and application of ternary NiO nanosheet@bimetallic CeCuOx microchip core-shell structure composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 CeCuO x The preparation of microchips, the specific steps are as follows:

[0035] At room temperature, the Ce(NO 3 ) 3 ·6H 2 O (0.868 g, 2 mmol) and Cu (NO 3 ) 2 ·3H 2 O (0.242 g, 1 mmol) was dissolved in DMF (40 ml) and stirred at 1000 rpm for 2 h; H2 BDC (0.664 g, 4 mmol) was dissolved in DMF (40 ml) and stirred at 1000 rpm for 2 h. The two solutions were then mixed with ultrapure water (20 ml) in a stainless steel autoclave, subjected to solvothermal synthesis at 80 °C for 24 h, and the obtained blue precipitate CeCuBDC was washed several times with DMF and ethanol, and then heated at 65 °C C under vacuum for 6 h, then calcined CeCuBDC in air at 350 °C for 4 h at a rate of 3 °C / min from room temperature to 350 °C to obtain CeCuO x microchip. attached figure 1 for CeCuO x SEM image of the microchip, attached figure 2 for CeCuO x The TEM image of the microchip; it can be seen from the figure that the microchip has a two-dimensional layered struc...

Embodiment 2

[0036] Example 2 Ternary NiO nanosheets@bimetallic CeCuO x The preparation of the microchip core-shell structure composite material, the specific steps are as follows:

[0037] Nickel oxide is 3 times that of CeCuO x Mass calculation feed ratio, the molar ratio of 1:5 Ni (NO 3 ) 2 and urea were dissolved in 100mL solution with a water / alcohol volume ratio of 1 / 1, then, 100mg of prepared CeCuO was added x Microchip powder (Example 1), and the resulting solution was placed at 80°C for 2 hours under normal stirring. The product powder was filtered and washed, then dried at 90 °C, followed by calcination at 350 °C in an air atmosphere for 4 h at a heating rate of 3 °C / min to obtain ternary NiO nanosheets@bimetallic CeCuO x Microplate core-shell composite material, named 3Ni / CeCuO x (Indicates that NiO nanosheets, bimetallic CeCuO x The weight ratio of microchips is 3:1), and then perform performance and characterization tests.

[0038] attached Figure 4 3Ni / CeCuO x SEM i...

Embodiment 3

[0041] Ternary NiO nanosheets@bimetallic CeCuO x The thermal catalysis conditions of the microchip core-shell structure composite material to toluene gas are: toluene concentration is 50 ppm (air is used as filling gas, purchased from Messer Air Liquide Co., Ltd.), and the amount of catalyst is 50 mg. According to the conventional method, the The catalyst was fixed on a fixed-bed reactor through a U-shaped tube, and the catalytic effect of the composite material on toluene gas under heating conditions was analyzed by gas chromatography, and the test condition was 36000 ml / (h∙g).

[0042] attached Figure 5 For ternary NiO nanosheets@bimetallic CeCuO x The thermocatalytic effect curve of microchip core-shell structure composites on toluene gas. attached by Figure 5 It can be seen that the present invention can be applied to the conversion of toluene at lower temperatures. Toluene pollution in the air mainly comes from building materials, interior decoration materials, livi...

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Abstract

The invention discloses a ternary NiO nanosheet@bimetallic CeCuOx microchip core-shell structure composite material as well as a preparation method and application thereof. CeCuOx has a large specificsurface area and good stability, nickel oxide nanosheets are grown on the surface of the CeCuOx through low-temperature hydrothermal and heat treatment methods, and the NiO / CeCuOx core-shell structure composite material catalyst is prepared. Compared with single metal oxide copper oxide and cerium oxide, the bimetallic CeCuOx microchip prepared by the method shows excellent performance on catalysis of toluene; the catalytic activity is effectively improved by further growing the nickel oxide nanosheets with different concentrations, and the 3Ni / CeCuOx catalyst can realize complete catalysis of toluene at 210 DEG C. Under the condition that precious metal is not used, complete catalytic oxidation of low-concentration methylbenzene at the low temperature is achieved through efficient combination of ternary transition metal, so that the cost is greatly saved; and the material has great research significance and certain application prospects for actually solving the problem of methylbenzene pollution gas in the air environment.

Description

technical field [0001] The invention relates to the technical field of nanocomposite materials, in particular to a NiO nanosheet@double metal CeCuO x Preparation of microplatelet core-shell composites and their application in thermocatalytic treatment of toluene. Background technique [0002] Volatile organic compounds (VOCs) with boiling points between room temperature and 260 °C are considered to be the main contributors to global air pollution, especially driven by environmental pollution such as ozone caused by toluene, photochemical smog and secondary aerosols, people Advocate for the use of effective technologies to reduce damage to the environment and human health. Low-temperature catalytic oxidation technology is considered to be an effective and economical method for the removal of toluene, which has attracted widespread attention. [0003] In recent years, many scientists have made great efforts to develop more efficient catalysts that can catalyze the oxidation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01D53/86B01D53/72
CPCB01J23/002B01J23/83B01D53/864B01J2523/00B01D2257/708B01J35/396B01J2523/17B01J2523/3712B01J2523/847B01J37/08B01J37/10B01D2255/2065B01D2255/20753B01D2255/20761B01D2257/7027B01J35/393B01J35/397B01J35/40B01J23/755B01J37/0219B01J37/0221B01J37/031B01J37/04B01J37/088B01J35/23
Inventor 路建美陈冬赟蒋军
Owner SUZHOU UNIV
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