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Catalyst for catalytic oxidation of VOCs and preparation method of catalyst

A catalytic oxidation and catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of difficult process control, difficult industrialization, etc. The effect of short cycle, easy availability of raw materials and economical raw materials

Pending Publication Date: 2021-12-31
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the hydrothermal method is carried out in a high temperature and high pressure environment, it is difficult to scale up industrially
The self-propagating combustion method is not easy to control because of the process, and there is a certain risk

Method used

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  • Catalyst for catalytic oxidation of VOCs and preparation method of catalyst
  • Catalyst for catalytic oxidation of VOCs and preparation method of catalyst
  • Catalyst for catalytic oxidation of VOCs and preparation method of catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A catalyst for the catalytic oxidation of VOCs, the active component of which includes a composite oxide of copper and manganese, and the main phase is Cu 1.5 mn 1.5 o 4 .

[0052] The specific surface area of ​​the catalyst is 230m 2 / g, the pore volume is 0.42cm 3 / g, the average pore diameter is 6.8nm.

[0053] Its preparation method comprises the following steps:

[0054] (1) Anhydrous copper acetate and manganese acetate with a molar ratio of copper and manganese of 1:2 are dissolved in a mixed solution of ethylene glycol and ethanol with a molar ratio of 1:3 to obtain solution A, and oxalic acid and used anhydrous copper acetate Oxalic acid with a molar ratio of 1:1.2 to manganese acetate is dissolved in another ethylene glycol and ethanol solution with a molar ratio of 1:3 to obtain solution B. Pour solution B into vigorously stirred solution A at room temperature and react at room temperature for 0.5 h, separating the generated sol-gel and drying at 80°C t...

Embodiment 2

[0060] Example 2 is basically the same as Example 1, except that in step (2), the solid obtained in step (1) is calcined at 400° C. to obtain a catalyst. The specific surface area is 208m 2 / g, the pore volume is 0.35cm 3 / g, the average pore diameter is 6.4nm.

Embodiment 3

[0062] Example 3 is basically the same as Example 1, except that in step (2), the solid obtained in step (1) is calcined at 450° C. to obtain a catalyst. The specific surface area is 158m 2 / g, the pore volume is 0.38cm 3 / g, the average pore diameter is 7.5nm.

[0063] Depend on figure 1 It can be seen that the main phase of the copper-manganese catalysts prepared at different temperatures in Examples 1, 2, and 3 is Cu 1.5 mn 1.5 o 4 , as the calcination temperature increases, the crystallinity increases and grains grow at high temperature. The low crystallinity is conducive to the generation of defects, thereby improving the ability of the catalyst to absorb oxygen.

[0064] Catalytic activity test: toluene concentration 1000ppm, gas space velocity 20000mlg -1 h -1 . Gas chromatography FID detects the concentration of toluene, and TCD detects the reaction tail gas CO 2 and CO. The obtained 350°C pyrolysis catalyst has a temperature of 100% conversion of toluene at...

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Abstract

The invention provides a catalyst for catalytic oxidation of VOCs and a preparation method of the catalyst. The active component of the catalyst comprises a composite oxide of copper and manganese, and a carrier is not needed. The preparation method comprises the following steps: (1) preparing a precursor: dissolving a copper salt and a manganese salt in a mixed solution of ethanol and ethylene glycol to obtain a solution A, dissolving oxalic acid in another ethanol and ethylene glycol solution to obtain a solution B, pouring the solution B into the violently stirred solution A at room temperature, reacting the solution for 0.5-2 hours at room temperature, separating generated sol-gel, and drying the sol-gel at 60-120 DEG C to obtain a solid; (2) heat treatment: calcining the solid obtained in the step (1) at 250-450 DEG C for 1-3 hours to obtain the catalyst. The catalyst has the characteristics of easy preparation, low cost, high activity and the like, and can completely degrade toluene; meanwhile, the synthesis period is short, the production cost is low, no harmful gas such as NOx is generated in the reaction process; the method has the advantages of being economical in raw material, convenient to operate, controllable in reaction condition, capable of reducing environmental pollution, capable of working continuously and the like.

Description

technical field [0001] The invention relates to the technical field of exhaust gas treatment, in particular to a catalyst for catalytic oxidation of VOCs. [0002] The present invention also relates to a preparation method of the above-mentioned catalyst for catalytic oxidation of VOCs. Background technique [0003] Volatile organic compounds (Volatile organic compounds, VOCs) are the main pollutants in the atmosphere, which are seriously affecting and endangering human health. Relevant studies have proved that more than 200 kinds of VOCs have the possibility of carcinogenic, mutagenic or teratogenic to organisms, such as benzene series (benzene, toluene, xylene, etc.). Therefore, the control and treatment of VOCs in the atmosphere is a key issue in environmental protection. Catalytic combustion technology can degrade VOCs into CO by flameless combustion at relatively low temperature (150-450°C). 2 and H 2 O, showing broad application prospects, and economical and effici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/10B01D53/86B01D53/72
CPCB01J23/005B01J23/8892B01D53/864B01D2257/7027B01D2257/708B01J35/633B01J35/647B01J35/615Y02A50/20
Inventor 黄张根张永朝曾泽泉侯亚芹
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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