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Chlorination aromatic hydrocarbon waste gases catalytic purification method

A catalytic purification and exhaust gas technology, applied in chemical instruments and methods, separation methods, and dispersed particle separation, etc., can solve the problems of easy loss of active components of catalysts, low catalytic combustion activity, short catalyst life, etc., and achieve environmental protection applications Prospect, effect of low catalyst cost

Inactive Publication Date: 2008-05-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The catalysts used for the catalytic combustion elimination of the above-mentioned chlorinated and volatile hydrocarbons all have more or less shortcomings, such as low catalytic combustion activity, polychlorinated hydrocarbons are produced during the catalytic combustion process, which is easy to cause secondary pollution, and the catalyst activity group Parts are easy to lose, catalyst life is short

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 3.0g of cetyltrimethylammonium bromide (CTMAB) and add 105ml of deionized water to dissolve at 30°C to produce a transparent template solution; then add 35ml of ethylenediamine (EDA) under stirring Put it into the flask together with the template solution and keep it at 30°C; then slowly drop the mixed solution of 15ml tetraethyl orthosilicate (TEOS) and 50ml deionized water into the above-mentioned system containing template agent, ethylenediamine and water, So that the amount of each substance in the system satisfies: n(TEOS):n(CTMAB):n(EDA):n(H 2 (0)=1: 0.12: 9.7: 130, stirred for 15min, and the pH of the acetic acid regulator system was 10.5, and after continuing to stir for 1.5h, the sol mixture was transferred to a 100ml stainless steel reactor with a polytetrafluoroethylene liner, at 120 It was statically crystallized in an oven at ℃ for 72 hours under its own pressure, taken out and cooled, washed with deionized water, filtered with suction, washed with abs...

Embodiment 2

[0036] Prepare cerium nitrate and copper nitrate into 0.923M and 0.89M aqueous solutions, adjust the pH value of the salt solution to 5 with ammonia water, take 14mL, and make MCM-41 / PO with various phosphoric acid contents according to the method of Example 1 3 10%CuO-20%CeO supported by H carrier 2 Catalyst 10g. Weigh 100mg of the catalyst, the reaction temperature is 350°C, the moisture content in humid air is 0.2vol%, the concentration of chlorobenzene is 0.1vol%, and the molar ratio of water to chlorobenzene is 2:1; The amount of waste gas is 30L, and the reaction pressure is 0.1Mpa. All the other reaction conditions are the same as in Example 1, the conversion rate of chlorobenzene is shown in Table 2, and the reaction products are carbon dioxide, hydrogen chloride and a trace amount of chlorine.

[0037] Table 2 10%MnOx-20%CeO supported on MCM-41 supports with different Si / P ratios 2 Chlorobenzene conversion rate (350°C)

[0038] Si / P(atom)

Embodiment 3

[0040] Commercially available SiO 2 Surface area is 303m 2 / g, by impregnating phosphoric acid in Example 1, SiO with various phosphoric acid contents 2 / PO 3 H carrier. Prepare aqueous solutions with concentrations of lanthanum nitrate, cerium nitrate, and manganese nitrate of 0.438M, 0.41M, and 0.82M respectively, adjust the pH value of the salt solution to 5 with ammonia water, take 14mL, and impregnate it on various carriers. The method of embodiment 1 is carried out, obtains 10La 2 o 3 -10%CeO 2 -10%MnOx / SiO 2 / PO 3 H catalyst. Weigh 200mg of each catalyst of this series, the reaction temperature is 350°C, the reaction pressure is 0.5Mpa, the moisture content in the humid air is 0.15vpl%, the concentration of chlorobenzene is 0.05vol%, and the amount of waste gas treated per gram of catalyst per hour is 15L, all the other reaction conditions are the same as in Example 1, the conversion rate of chlorobenzene is shown in Table 3, and the reaction products are carbo...

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PUM

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Abstract

The invention discloses a catalytic purification method of chlorobenzene waste gas. The invention includes the following steps: the reaction is carried out by introducing humid air into the waste gas containing chlorobenzene in the presence of the catalyst; the catalyst is composed of a carrier which is stable in humid air, transition metal oxide which is carried on the carrier, rare earth oxide and phosphoric acid; the using method of the invention is that, the invention can stably convert the chlorobenzene in the waste gas into carbon dioxide and hydrogen chloride in a long time in humid air, at lower reaction temperature and in the presence of oxidation decomposition catalyst, while the activity of the catalyst is not reduced; the catalyst is composed of transition metal oxide and rare earth oxide, so the cost of the catalyst is low. The invention uses the extremely economical method for eliminating chlorohydrocarbon in the waste gas, has no formation of polychlorinated by-products and does not cause secondary pollution, so the invention is a very effective method for the treatment of the waste gas containing chlorohydrocarbon and has greater environmental protection application prospect.

Description

technical field [0001] The invention belongs to the technical field of catalytic combustion environment protection, and in particular relates to a rare earth-based oxide catalyst used for low-temperature catalytic combustion elimination of volatile chlorinated aromatic hydrocarbons and a preparation method thereof, and provides a catalyst for complete catalytic combustion A method for eliminating volatile chlorinated aromatic hydrocarbon pollutants in the environment. Background technique [0002] Chlorine-containing volatile hydrocarbons can not only cause serious harm to human health, but also cause lasting and cumulative effects on biological systems, and can destroy the atmospheric ozone layer. The 12 top persistent organic pollutants listed in the United Nations Environment Program International Treaty are all chlorine-containing organic compounds. Chlorine-containing volatile hydrocarbons are divided into chlorinated aromatic hydrocarbons, such as chlorobenzene and di...

Claims

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Application Information

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IPC IPC(8): A62D3/20A62D3/38B01D53/70B01D53/86A62D101/22
Inventor 王幸宜李到
Owner EAST CHINA UNIV OF SCI & TECH
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