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A nanoflower spinel COMN for catalytic oxidation of VOCs 2 o 4 Catalyst, preparation method and application

A catalytic oxidation and nanoflower technology, applied in metal/metal oxide/metal hydroxide catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc. control, increase the cost of catalyst preparation, etc., to achieve good industrial application prospects, good low-temperature activity and stability, and good low-temperature reduction performance.

Active Publication Date: 2020-06-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

China Patent Network CN 102000576 A prepared a two-component Cu-Co-O composite oxide by high-temperature ball milling method, with spinel CuCo 2 o 4 And the Cu-Co solid solution exists, and the complete oxidation of toluene can be realized at 250 °C, but the high-temperature ball milling method requires the precursor to be subjected to high-temperature treatment, which will increase the preparation cost of the catalyst
Although there are cutting-edge literatures on the preparation of spinel catalysts, it is still difficult to control the preparation of single-phase spinel catalysts under mild conditions. At the same time, its specific surface area is low, the low-temperature oxidation activity of VOCs needs to be improved, and the energy consumption of VOCs removal larger, increasing the cost of its application

Method used

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  • A nanoflower spinel COMN for catalytic oxidation of VOCs <sub>2</sub> o <sub>4</sub> Catalyst, preparation method and application
  • A nanoflower spinel COMN for catalytic oxidation of VOCs <sub>2</sub> o <sub>4</sub> Catalyst, preparation method and application
  • A nanoflower spinel COMN for catalytic oxidation of VOCs <sub>2</sub> o <sub>4</sub> Catalyst, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Spinel CoMn 2 O 4 Preparation:

[0021] 0.04 mol manganese acetate and 0.02 mol cobalt nitrate were dissolved and dispersed in 10 mL of ethanol solution, and placed in a heat-collecting thermostatic magnetic stirrer at 80°C for vigorous stirring. Then quickly add 0.24 mol / L oxalic acid solution, control the ratio of metal to oxalic acid to 1:1.2, and continue to stir for 30 minutes in a heat-collecting thermostatic magnetic stirrer at 80°C. The obtained material was washed by centrifugation, placed in an oven at 60-100℃, dried for 12-24h, and finally calcined in a muffle furnace at 400℃ for 3h at a heating rate of 1℃ / min to obtain spinel CoMn 2 O 4 catalyst.

Embodiment 2

[0027] The toluene oxidation performance test of the four catalysts prepared in Example 1 and Comparative Example 1 was carried out continuously on a self-built micro response device, with argon as the balance gas, and gas chromatography GC2014 equipped with TCD and FID detectors for online detection After the reaction, the gaseous substance toluene molecule and the product CO 2 molecular.

[0028] The specific reaction conditions are: the concentration of toluene is 500 ppm, the flow rate of the mixed gas is 75 mL / min, and the reaction space velocity is 22500 mL / g h. Toluene oxidation conversion rate calculation formula: toluene conversion rate %=[(initial concentration of toluene-concentration after toluene reaction) / initial concentration of toluene]*100. Reactivity as figure 1 As shown, the spinel CoMn 2 O 4 The catalyst has the best activity, reaching 90% toluene conversion at 210°C.

Embodiment 3

[0030] For the spinel CoMn prepared in Example 1 2 O 4 The catalyst was continuously operated at 220°C under the reaction conditions of Example 2 to test the stability performance of the catalyst. The stability performance was as follows: figure 2 As shown, the conversion rate remained above 98% within 700 minutes.

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Abstract

The invention belongs to the technical field of environmental catalytic purification and provides a nanoflower spinel CoMn used for catalytic oxidation of VOCs. 2 O 4 Catalysts, preparation methods and applications. Oxalic acid is used as a precipitant, washed, dried and calcined to obtain spinel CoMn 2 O 4 catalyst. CoMn prepared by the present invention 2 O 4 The catalyst exhibits self-assembly of nanosheets to form nanoflower-like structures. Compared to oxide Co 3 O 4 ,MnO x and mixed phase Co 3 O 4 / MnO x and the spinel CoMn currently reported in the literature. 2 O 4 Catalyst, spinel CoMn prepared by the present invention 2 O 4 The catalyst shows good activity and stability in VOCs removal. It can reach 99% toluene removal rate at 220°C, 100% conversion of formaldehyde at 90°C, and 100% acetone removal rate at 170°C. , has good industrial application prospects.

Description

Technical field [0001] The invention relates to a spinel CoMn 2 O 4 A catalyst and a preparation method for efficiently removing VOCs belong to the technical field of environmental catalytic purification. Background technique [0002] With the continuous development of the related chemical industry, the emission of volatile organic pollutants in the air continues to increase. Volatile organic pollutants have a wide range of sources, mainly from organic solvents used in interior decoration materials, water-containing paints, paints, etc., as well as industrial waste gas and motor vehicle exhaust. Faced with the continuous increase of volatile organic pollutants and the adverse effects on humans, animals and plants, it is urgent to control the emission of volatile organic pollutants. Catalytic oxidation method to remove VOCs is widely used as an efficient removal method. The development of efficient and stable catalysts is of great significance. [0003] Studies have found that tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01J35/10B01J37/03B01J37/08B01D53/86B01D53/44
CPCB01D53/8687B01J23/005B01J23/8892B01J37/036B01J37/082B01D2257/708B01J35/393B01J35/23B01J35/615Y02A50/20
Inventor 曲振平董翠
Owner DALIAN UNIV OF TECH
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