Ozone-assisted method for catalytic decomposition of volatile organic pollutants in high-temperature flue gas

A volatile organic, high-temperature flue gas technology, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, can solve the problems that hinder the application of selective catalytic decomposition technology, reduce the catalytic decomposition temperature, etc., and achieve the improvement of catalytic decomposition efficiency , Promote catalytic decomposition, improve the effect of selectivity

Active Publication Date: 2012-12-12
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, reducing the catalytic decomposition temperature and increasing the selectivity of carbon dioxide are two main obstacles hindering the application of selective catalytic decomposition technology.

Method used

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  • Ozone-assisted method for catalytic decomposition of volatile organic pollutants in high-temperature flue gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The catalyst in the fixed bed reactor of the catalytic reaction is supported by carbon nanotubes, with CuO and Cu 2 O is the active component, and its active component accounts for 6% of the total mass of the catalyst. Ozone gas is introduced into the fixed bed reactor, and the concentration of the introduced ozone gas is 11.0mg / L.

[0014] Analysis and Determination of Chlorobenzene Concentration and CO Discharged from Fixed Bed Reactor Using Online Gas Chromatography 2 Concentration: In the absence of ozone, the conversion rates of chlorobenzene at 150°C, 200°C, 250°C, and 300°C were 12%, 15%, 23%, and 50% respectively; CO 2 The selectivities are 2%, 3%, 6%, and 10%, respectively. After adding ozone, the conversion of chlorobenzene increased to 87%, 88%, 80%, and 93%, respectively; 2 The selectivities were increased to 24%, 40%, 35%, and 45%, respectively.

Embodiment 2

[0016] The catalyst in the fixed-bed reactor of the catalytic reaction is supported by activated carbon, with CuO and Cu 2 O is the active component, and its active component accounts for 6% of the total mass of the catalyst. Ozone gas is introduced into the fixed-bed reactor, and the concentration of the introduced ozone gas is 16.6mg / L.

[0017] Analysis and Determination of Chlorobenzene Concentration and CO Discharged from Fixed Bed Reactor Using Online Gas Chromatography 2 Concentration: In the absence of ozone, the conversion rates of benzene at 150°C, 200°C, 250°C, and 300°C were 16%, 22%, 31%, and 62% respectively; CO 2 The selectivities were 2.5%, 4%, 7.3%, and 12.4%, respectively. After adding ozone, the conversion of benzene increased to 80%, 76%, 83%, and 92%, respectively; 2 The selectivities were increased to 25.4%, 38%, 41.6%, and 52.7%, respectively.

Embodiment 3

[0019] The catalyst in the fixed bed reactor of the catalytic reaction is based on carbon nanotubes, with CuO, Cu 2 O, FeO and Fe 2 o 3 It is an active component, and its active component accounts for 20% of the total mass of the catalyst. The ozone gas is introduced into the fixed bed reactor, and the concentration of the introduced ozone gas is 3.0mg / L.

[0020] Analysis and Determination of Toluene Concentration and CO Discharged from Fixed Bed Reactor by Online Gas Chromatography 2 Concentration: In the absence of ozone, the conversion rates of toluene at 150°C, 200°C, 250°C, and 300°C were 21%, 24.8%, 33%, and 67.5% respectively; CO 2 The selectivities were 4%, 5.2%, 11%, and 17.9%, respectively. After adding ozone, the conversion of toluene increased to 90%, 82.6%, 89%, and 95%, respectively; 2 The selectivities increased to 31.3%, 45.7%, 47.4%, and 62.5%, respectively.

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Abstract

The invention discloses an ozone-assisted method for catalytic decomposition of volatile organic pollutants in high-temperature flue gas. According to the invention, ozone gas is introduced into a fixed bed reactor of a catalytic reaction. According to the catalyst in the fixed bed reactor, carbon nano-tubes, activated carbon, titanium dioxide, silica, or a composition thereof is adopted as a carrier; and Mn2O3, MnO2, CeO2, CuO, Cu2O, V2O5, Fe2O3, FeO, or a composition thereof is adopted as an active component. The active component accounts for 1-50% of total mass of the catalyst. The concentration of the introduced ozone gas is in a range of 0.1-50mg / L. According to the invention, a strong oxidant ozone is introduced in a catalytic decomposition process, such that active oxygen in the system is increased, catalytic decomposition of pollutant molecules is promoted, catalytic decomposition efficiency of the catalyst upon the volatile organic pollutants is substantially improved, and carbon dioxide selectivity is greatly improved. Therefore, an optimal effect of volatile organic pollutant low-temperature catalytic decomposition is achieved.

Description

technical field [0001] The invention relates to a method for decomposing volatile organic pollutants in high-temperature flue gas, especially by adding super-strong oxidizing gas ozone into a fixed-bed reactor for catalytic reaction, and using ozone to assist catalytic decomposition of volatile organic pollutants in high-temperature flue gas way of things. Background technique [0002] Volatile organic compounds (VOCs) are compounds with a boiling point of 50-250°C, a saturated vapor pressure of more than 133.32KPa at room temperature, and a class of organic compounds that exist in the air in the form of vapor at room temperature. The main components of volatile organic compounds are: hydrocarbons, halogenated hydrocarbons, oxygen hydrocarbons and nitrogen hydrocarbons, which include: benzene series, organic chlorides, Freon series, organic ketones, amines, alcohols, ethers, esters, acids and petroleum hydrocarbon compounds, etc. [0003] Volatile organic compounds mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/76B01D53/86B01D53/44
Inventor 陈儒杨杭生谭志谋马朝霞张孝彬
Owner ZHEJIANG UNIV
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