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Preparation method of a two-dimensional sheet-like porous composite oxide and its application in the control of chlorine-containing volatile organic pollutants

A composite oxide and sheet-like technology, applied in the field of air pollution control, can solve the problems of large energy consumption, achieve high stability and chlorine resistance, excellent oxidation ability of chlorine-containing volatile organic compounds and dechlorination ability

Active Publication Date: 2021-11-19
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used catalytic treatment technology is regenerative thermal incinerator (RTO) technology. Although this technology has a good adsorption and purification effect and a cool treatment effect, its operating temperature is generally above 800°C and has a large energy consumption.

Method used

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  • Preparation method of a two-dimensional sheet-like porous composite oxide and its application in the control of chlorine-containing volatile organic pollutants
  • Preparation method of a two-dimensional sheet-like porous composite oxide and its application in the control of chlorine-containing volatile organic pollutants
  • Preparation method of a two-dimensional sheet-like porous composite oxide and its application in the control of chlorine-containing volatile organic pollutants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1 Preparation of bifunctional and multi-effect cobalt-zinc oxide by in-situ crystallization combined with in-situ chemical precipitation

[0038]Completely dissolve 0.045mol of dimethylimidazole in 100mL of anhydrous methanol, and stir at 500rpm for 10min to form a colorless, clear and transparent solution A; completely dissolve 0.045mol of zinc nitrate hexahydrate in 100mL of anhydrous methanol and stir at 500rpm for 20min to form a colorless, clear and transparent solution B; gradually add solution B to A and mix evenly, and stir at 600rpm for 10min, then adjust the speed to 200rpm and stir until the solution turns white. Then let the white solution stand for 48 hours, filter the mixture, wash with absolute ethanol and deionized water for more than three times, and dry at 60°C; grind 0.2 g of the prepared white powder into a fine powder, add 30 mL of deionized In water, use an ultrasonic instrument to sonicate the solution until the white powder is completely ...

Embodiment 2

[0039] Example 2 Activity Test and Evaluation of Cobalt-Zinc Composite Metal Catalytic Material Catalytic Degradation of 1,2-Dichloroethane

[0040] Get the solid powder tableting obtained in Example 1, sieve (40-60 mesh), and accurately take by weighing 0.5g catalyzed material after sieving with 1,2-dichloroethane as probe gas, the reactant The concentration was controlled at 1000ppm, the reaction space velocity was 36000mL / g h, and the oxygen concentration was 21%. 400°C) catalytic activity, and the reaction products were monitored and analyzed by gas chromatography.

Embodiment 3

[0041] Example 3 Stability Test of Cobalt-Zinc Composite Metal Catalytic Material Catalyzed Degradation of 1,2-Dichloroethane

[0042] Get the solid powder obtained in Example 1 and press into tablets, sieve (40-60 mesh), accurately weigh 0.5g of the catalytic material after sieving and place it in the fixed bed of the evaluation device, and use 1,2-dichloroethane Alkanes are used as probe gas, the concentration of reactants is controlled at 1000ppm, and the reaction space velocity is 36000h -1 , the oxygen concentration was 21%, and the catalytic reaction activity of the catalyst at 370°C was continuously tested, and the reaction products were monitored and analyzed by gas chromatography.

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Abstract

The invention discloses a preparation method of a two-dimensional flaky porous composite oxide and its application in the control of chlorine-containing volatile organic pollutants. The aqueous solution of zinc nitrate hexahydrate is added to the methanol solution of dimethylimidazole, and stirred until white, filtered, and dried to obtain a white powder; add an aqueous cobalt nitrate hexahydrate solution to the white powder aqueous solution, then add ammonia water, stir, and then hydrothermally crystallize at 120-160°C for 8-12h, then dry and roast to obtain Two-dimensional sheet-like porous composite oxides. The two-dimensional sheet-like catalytic material prepared by the invention has a very rich pore structure and highly dispersed active sites, which can effectively improve the mass transfer capacity of target pollutants, thereby exhibiting excellent oxidation performance of chlorinated volatile hydrocarbons. The invention has the advantages of low raw material price, simple synthesis method, simple synthesis conditions, low requirements on equipment, and good industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a preparation method of a two-dimensional sheet-shaped porous composite oxide and its application in the control of chlorine-containing volatile organic pollutants. Background technique [0002] With the development of my country's economy and industry, at present, my country's emissions of volatile organic pollutants (VOCs) are about 31 million tons per year, ranking first in the world and increasing year by year. VOCs refer to organic compounds composed of various high vapor pressure (>133.32Pa) and low boiling point (50-260°C) organic compounds. Its variety mainly includes: hydrocarbons, aldehydes, alcohols, ketones, aromatic hydrocarbons, esters and ethers, etc. The main sources are organic chemical, pharmaceutical, surface spraying, printing, dry cleaning, grain storage and motor vehicle exhaust Emissions and other aspects are important factors ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/80B01J35/10B01J37/10B01J37/03B01J37/08B01D53/86B01D53/70
CPCB01J23/80B01J23/002B01J37/10B01J37/031B01J37/086B01D53/8668B01D2257/2064B01D2257/708B01J35/60
Inventor 何炽田明姣姜泽宇李璐马牧笛
Owner XI AN JIAOTONG UNIV
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