Method for treating volatile aryl chloride pollutant and catalyst

A chlorinated aromatic hydrocarbon and volatile technology, applied in the field of pollutant treatment, can solve problems such as polychlorinated organic pollutants, and achieve the effect of inhibiting enrichment

Inactive Publication Date: 2019-01-08
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the catalytic combustion of CVOCs, especially the catalytic combustion of chlorinated aromatics, the accumulation of chlorine species in the reaction process leads to polychlorinated organic pollutants, even persistent organic pollutants such as hexachlorobenzene, polychlorinated biphenyls, and dioxins. The generation of carbon dioxide has always been the bottleneck and key problem limiting the application of CVOCs catalytic oxidation technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] at 40000ppmH 2 O / N 2 Under the reaction atmosphere, 0.5%Pd / ZSM-5(SiO 2 / Al 2 o 3 =25) The catalyst is used for the catalytic degradation of o-dichlorobenzene.

[0022] The evaluation reaction was carried out in a fixed-bed continuous flow device, and o-dichlorobenzene gas was generated by carrying. The catalyst is placed in a quartz reaction tube (with an inner diameter of 6mm), the total flow rate of the gas is 400ml / min, and the reaction space velocity is 50000h -1 , the reaction temperature is 200-600 ° C, a temperature point every 25 ° C, and each temperature point is kept for 0.5 h. The reactants and products are detected online by GC-6820 gas chromatography and Fourier transform infrared spectroscopy gas analyzer. The results show that at 40000ppmH 2 O / N 2 Under the reaction atmosphere, 2000ppm o-dichlorobenzene is completely catalytically degraded at 475°C, and no polychlorinated by-products are formed at this temperature.

Embodiment 2

[0024] at 40000ppmH 2 O, air reaction atmosphere, 0.5% Pd / ZSM-5 (SiO 2 / Al 2 o 3 =25) The catalyst is used for the catalytic degradation of o-dichlorobenzene.

[0025] Except for the reaction atmosphere, all the other conditions were the same as in Example 1. The results show that at 40000ppmH 2 O. Under the air reaction atmosphere, 2000ppm o-dichlorobenzene is completely catalytically degraded at 500°C, but at this temperature there are 1,2,4-trichlorobenzene (6ppm), 1,2,3-trichlorobenzene (1.5ppm) Two polychlorinated organic by-products were formed.

Embodiment 3

[0030] at 20000ppmH 2 O / N 2 Under reaction atmosphere, 0.5% Pd / Al 2 o 3 The catalyst is used for the catalytic degradation of o-dichlorobenzene.

[0031] The evaluation reaction was carried out in a fixed-bed continuous flow device, and o-dichlorobenzene gas was generated by carrying. The catalyst is placed in a quartz reaction tube (with an inner diameter of 6mm), the total flow rate of the gas is 35ml / min, and the reaction space velocity is 1000h -1, the reaction temperature is 200-600°C, one temperature point every 25°C, each temperature point is kept for 0.5h, and the reactants and products are detected online by GC-6820 gas chromatography and Fourier transform infrared spectroscopic gas analyzer. The results show that at 20000ppmH 2 O / N 2 Under the reaction atmosphere, 500ppm o-dichlorobenzene can be completely catalytically degraded at 500°C, and no polychlorinated by-products are formed at this temperature.

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PUM

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Abstract

The invention relates to the technical field of pollutant treatment and in particular relates to a method for treating volatile aryl chloride pollutants and a catalyst. The volatile aryl chloride pollutants and steam are dissociated on the surface of the catalyst and are further reacted, and then multi-chloro organic byproducts, even long-lasting organic pollutants such as hexachlorobenzene, polychlorinated biphenyl and dioxin, can be effectively inhibited. Due to adoption of the steam in a reaction gas, a sufficient hydrogen source is provided, enrichment of chlorine substances on the surfaceof the catalyst can be inhibited, generation of harmful substances such as the multi-chloro organic byproducts in a product can be effectively inhibited, and complete catalytic degradation can be achieved for the volatile aryl chloride pollutants at a certain temperature. The method comprises the following steps: (1) providing the catalyst; (2) carrying out reaction treatment.

Description

technical field [0001] The invention relates to the technical field of pollutant treatment, in particular to a method and catalyst for treating volatile chlorinated aromatic hydrocarbon pollutants. Background technique [0002] In recent years, the serious impact of volatile organic compounds (Volatile Organic Compounds, VOCs) on the atmospheric environment and human health has attracted widespread attention. Chlorinated Volatile Organic Compounds (CVOCs for short) are a type of common organic pollutants in industrial emissions, mainly including chlorinated aromatics (such as chlorobenzene, dichlorobenzene and trichlorobenzene, etc.) and chlorinated hydrocarbons (such as Dichloromethane, chloroform, carbon tetrachloride, vinyl chloride and tetrachloroethylene, etc.). Volatile chlorinated aromatics pollutants mainly come from industrial production process leakage and emissions, municipal waste incineration and waste gas from thermal power plants. Among the current mainstrea...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/72B01J23/44B01J23/755B01J23/83B01J23/889B01J29/44
CPCB01D53/8662B01D2255/1023B01D2255/2063B01D2255/20715B01D2255/2073B01D2255/20753B01D2255/2092B01D2255/504B01D2257/2064B01J23/002B01J23/44B01J23/755B01J23/83B01J23/8892B01J29/44B01J2523/00B01J2523/3706B01J2523/72B01J2523/847B01J2523/48B01J2523/31B01J2523/845
Inventor 程杰郝郑平李娜张鑫张中申
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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