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Method for eliminating chlorine-containing volatile organic pollutants through high-temperature catalytic combustion

A volatile organic compound and volatile organic technology is applied in the field of high-temperature catalytic combustion and elimination of chlorine-containing volatile organic pollutants, and can solve the problems of many chlorine-containing by-products, deactivation, and easy carbon deposition.

Pending Publication Date: 2021-04-20
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems, the present invention provides a high-temperature catalytic combustion elimination method for CVOCs that has high mineralization efficiency and can effectively suppress the production of chlorine-containing organic by-products. This method utilizes high-temperature-resistant catalytic materials at relatively high Under the reaction temperature (500-1000 ℃), the complete mineralization of CVOCs pollutants is realized. While maintaining the high catalytic activity and mineralization rate of CVOCs, it mainly solves the problem of low-temperature catalytic oxidation projects of traditional precious metals, molecular sieves and other catalytic systems. Chlorine poisoning and deactivation due to carbon deposition, and many chlorine-containing by-products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Preparation of hexaaluminate LaM by coprecipitation method x al 12-x o 19 (M=Fe, Co, Ce, Cu, Ni, Mn) catalyst materials, prepare metal nitrate mixed solution and ammonium carbonate solution according to the stoichiometric ratio of the target product. At 60°C, pour the mixed cation solution into the saturated ammonium carbonate solution, and maintain the Ph at about 7.5-9.0. After aging with stirring for 3 hours, it was centrifuged and dried at 120°C for 12 hours. After the dried sample was ground, it was placed in a corundum crucible, the temperature was raised to 500°C at 5°C / min, and maintained for 5 hours, and then the temperature was raised from 500°C to 1200°C at 2°C / min for 6 hours.

[0017] In the air reaction atmosphere, hexaaluminate LaMn 3 al 9 o 19The catalyst is used for the catalytic degradation of 1,2-dichloroethane. The evaluation of reaction performance was carried out in a fixed-bed continuous flow reactor, and 1,2-dichloroethane gas was a custom...

Embodiment 2

[0019] Adopt the method for embodiment 1 to prepare hexaaluminate LaFeAl 11 o 19 Catalyst for the catalytic degradation of dichlorobenzene. In an air reaction atmosphere, the hexaaluminate LaFeAl 11 o 19 The catalyst is used for the catalytic degradation of dichlorobenzene. The reaction evaluation method is the same as in Example 1, carried out in a fixed-bed continuous flow device, o-dichlorobenzene gas generates steam by bubbling at a specific temperature, the o-dichlorobenzene concentration is 500 ppm, and the total flow of gas is 400 ml / min, the concentration of water is 4000 ppm, and the reaction temperature is 200-1000°C. The results showed that under the air reaction atmosphere, 500 ppm of dichlorobenzene was completely degraded at 500℃, and no organic and chlorinated organic by-products were formed at this temperature. After operating at 500°C, 800°C and 1000°C for 100 hours, the removal rate of p-dichlorobenzene was 100%, and no organic by-products were detected ...

Embodiment 3

[0021] Preparation of hexaaluminate LaM by sol-gel method x Al 12-x o 19 (M=Fe, Co, Ce, Cu, Ni, Mn) catalyst material. According to the stoichiometric ratio of the target product, the metal nitrate mixture and La(NO 3 ) 3 ∙6H 2 The O solution is mixed, and an appropriate amount of aminoacetic acid is added (to meet the molar ratio COOH / NO 3- =1.05,), heated and stirred in a constant temperature water bath at 8090 °C to evaporate to gel, pre-decomposed at 250 °C for 30 min, put the decomposed precursor in a muffle furnace and roasted at 1200 °C for 5 h, cooled, pressed into tablets and sieved into 4080 mesh granular catalyst.

[0022] The prepared hexaaluminate LaCu 3 Al 9 o 19 The catalyst is used for the catalytic degradation of 1,2-dichloroethane. The evaluation method of the reaction performance is basically the same as that of Example 1, except that the concentration of 1,2-dichloroethane to be treated is 20000 ppm. The results showed that 20,000 ppm of 1,2-dich...

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Abstract

The invention discloses a method for removing chlorine-containing volatile organic compounds through catalytic combustion. According to the method, high-temperature-resistant hexaaluminate and pyrochlore materials are used as combustion catalysts, the chlorine-containing volatile organic compounds in air are completely degraded under the action of the catalysts to be converted into carbon dioxide, water, hydrogen chloride and chlorine within the temperature range of 500 DEG C to 1000 DEG C, and tail gas after complete combustion can be exhausted after being absorbed by an alkaline solution. The method provided by the invention overcomes the problems of easy deactivation and easy generation of toxic organic by-products of present catalysts, can effectively avoid the generation of the organic by-products, and does not cause secondary pollution. Under the reaction conditions of the method, the utilized catalysts have the advantages of good catalytic activity, strong chlorine poisoning resistance, long service life, no need of frequent regeneration, strong thermal shock resistance, good high-temperature adaptability, stable performance and the like. The method provided by the invention is suitable for removing halogen-containing organic compounds, especially the chlorine-containing volatile organic compounds.

Description

technical field [0001] The invention belongs to the technical field of catalytic combustion environmental protection, in particular to a method for high-temperature catalytic combustion elimination of chlorine-containing volatile organic pollutants. Background technique [0002] The emissions of volatile organic pollutants (Volatile Organic Compounds, referred to as VOCs) are fine particulate matter (PM2.5) and ozone (O 3 ) is an important source of formation. The emission of VOCs not only causes serious pollution to the environment, but also causes direct or indirect harm to human health. Chlorinated Volatile Organic Compounds (CVOCs for short) are a type of common organic pollutants in industrial emissions, which are emitted in various industrial processes, such as bleaching of wood pulp with chlorine-based oxidants, vinyl chloride preparation process, manufacturing Leather, washing, pharmaceutical and other industries. Chlorine-containing volatile organic compounds can...

Claims

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Application Information

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IPC IPC(8): F23G7/07B01D53/78B01D53/68B01D53/40
Inventor 张中申郝郑平段潇潇屈溁敏黎刚刚赵挺程杰
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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