A process for microwave synergistic catalytic oxidation of vocs

A technology of synergistic catalysis and catalytic oxidation, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles. It can solve the problems of small specific surface area and limit the use of catalyst carriers, achieve rapid temperature rise, facilitate engineering applications, and improve stability. sexual effect

Active Publication Date: 2020-05-08
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific surface area of ​​currently available SiC materials is very small, which limits their use as catalyst supports.

Method used

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  • A process for microwave synergistic catalytic oxidation of vocs
  • A process for microwave synergistic catalytic oxidation of vocs

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The waste gas containing toluene was degraded by microwave synergistic catalytic oxidation technology on the gas dynamic simulation experiment system. The catalyst mixed and diluted with quartz sand is filled in the catalytic reactor, the inlet and outlet gases are analyzed by gas chromatography (GCT890), and the chromatographic column filler is 5A molecular sieve. The catalyst is silicon carbide modified alumina supported Co 3 o 4 and CeO 2 , where SiC doping mass fraction is 5%, Co 3 o 4 The loading amount is 5%, CeO 2 The loading is 2.5% and the rest is alumina. The composition of the reaction gas is: toluene injection concentration: 600ppm; air flow rate 0.08m 3 / h, microwave power 100w. The reaction gas is pumped into the catalytic oxidation reactor in the microwave device through the fan, relying on microwave heating and inducing catalytic oxidation, cooperating with the adsorption and catalytic oxidation of the catalyst, the degradation efficiency of tolue...

Embodiment 2

[0037] The waste gas containing toluene was degraded by microwave synergistic catalytic oxidation technology on the gas dynamic simulation experiment system. The catalyst mixed and diluted with quartz sand is filled in the catalytic reactor, and the inlet and outlet gases are analyzed by gas chromatography (GCT890), and the chromatographic column filler is 5A molecular sieve. The catalyst is silicon carbide modified alumina supported Co 3 o 4 and CeO 2 , where SiC doping mass fraction is 5%, Co 3 o 4 The loading amount is 5%, CeO 2 The loading is 2.5% and the rest is alumina. The composition of the reaction gas is: toluene injection concentration: 600ppm; air flow rate 0.08m 3 / h, microwave power 300w. At 240°C, the degradation efficiency of toluene can reach 94.5%.

Embodiment 3

[0039] The waste gas containing toluene was degraded by microwave synergistic catalytic oxidation technology on the gas dynamic simulation experiment system. The catalyst mixed and diluted with quartz sand is filled in the catalytic reactor, and the inlet and outlet gases are analyzed by gas chromatography (GCT890), and the chromatographic column filler is 5A molecular sieve. The catalyst is silicon carbide modified alumina supported Co 3 o 4 and CeO 2, where SiC doping mass fraction is 5%, Co 3 o 4 The loading amount is 10%, CeO 2 The loading is 5% and the rest is alumina. The composition of the reaction gas is: toluene injection concentration: 600ppm; air flow rate 0.08m 3 / h, microwave power 300w. At 240°C, the degradation efficiency of toluene can reach 95.7%.

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Abstract

The invention belongs to the field of organic waste gas catalysis and particularly discloses a process of microwave-cooperated catalytic oxidization of VOCs. The method includes the steps of: organicwaste gas is pressurized via a draught fan and then is fed into a catalytic oxidization reactor of a microwave apparatus, wherein a catalyst is placed in the catalytic oxidization reactor, so that microwave heating is carried out for inducing the catalytic oxidization. The process modifies a conventional catalytic oxidization process with electric furnace for heating materials, so that sintering deactivation and efficiency reduction of the catalyst are alleviated, and stability of the catalyst is improved. Combination mode of silicon carbide and the catalyst is modified, so that the catalyst is heated at higher speed and uniformity, catalytic oxidization temperature is significantly reduced and efficiency is increased. The process also reduces usage amount of the silicon carbide and savescost, is easy to technically carry out and is beneficial to engineering application.

Description

technical field [0001] The invention relates to a process for microwave synergistic catalytic oxidation of VOCs, which belongs to the field of air pollution control. Background technique [0002] With the acceleration of economic construction and the rapid development of industrial enterprises, the emission of volatile organic compounds (VOCs) is increasing day by day, which seriously threatens public health and the living environment. VOCs themselves are toxic and accompanied by stench, and some of them can cause cancer and destroy the ozone layer. They are primary pollutants; VOCs and nitrogen oxides generate photochemical smog under ultraviolet radiation, and VOCs, as the precursor of PM2.5, are the cause of fog One of the culprits of smog is a serious threat to public health and the living environment. The degradation of VOCs is a very important work in the environmental field. [0003] The catalytic combustion method has the advantages of low temperature, high catalyt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/44B01D46/02
CPCB01D46/02B01D53/8687B01D2257/708B01D2259/806
Inventor 胡将军刘芬
Owner WUHAN UNIV
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