Method for eliminating chloro-aromatics low temperature catalytic combustion

A technology of chlorinated aromatic hydrocarbons and low-temperature catalysis, which is applied in the direction of combustion methods, combustion types, incinerators, etc., can solve the problems of easy loss of catalyst active components, low catalytic combustion activity, short catalyst life, etc., and achieve a convenient and practical technical route , High catalytic activity, strong anti-chlorine poisoning ability

Inactive Publication Date: 2008-08-20
EAST CHINA UNIV OF SCI & TECH
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  • 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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  • Method for eliminating chloro-aromatics low temperature catalytic combustion
  • Method for eliminating chloro-aromatics low temperature catalytic combustion
  • Method for eliminating chloro-aromatics low temperature catalytic combustion

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Commercially available 25g cerium nitrate (Ce(NO 3 ) 3 )·6H 2 O and 60g copper nitrate Cu(NO 3 ) 2 )·3H 2 O was dissolved in 80mL of ionized water, and the solution was placed in a constant temperature water bath at 50°C and stirred for 0.5h; then 70g of γ-Al was added to the solution 2 o 3 (with a surface area of ​​212m 2 / g), stirring continuously, until the impregnating solution is covered with γ-Al 2 o 3 After fully absorbed, stand still and age for 12 hours, then dry in an oven at 100°C for 24 hours, move to a roaster, program temperature rise in air atmosphere, 1°C per minute, rise to 180°C, keep for 2 hours; then program temperature increase, every minute 10°C, raise the temperature to 550°C, and keep it for 4 hours, you can get 20%CuO-10%CeO 2 / γ-Al 2 o 3 (by weight CuO:CeO 2 2:1) catalyst.

[0026] Prepare 22% Fe by implementing the method of 1 2 o 3 -8%CeO 2 / γ-Al 2 o 3 (by weight Fe 2 o 3 : CeO 2 is 22:8) the catalyst is Example 2.

[00...

Embodiment 4

[0029] Commercially available 5.3g lanthanum nitrate (La(NO 3 ) 3 )·6H 2 O and copper nitrate 32g Cu(NO 3 ) 2 )·3H 2 O was dissolved in 80mL of ionized water, and the solution was placed in a constant temperature water bath at 50°C and stirred for 0.5h; then 86g of SiO was added to the solution 2 (with a surface area of ​​312m 2 / g), stirring continuously during the process, until the impregnating solution is covered by SiO 2 After all absorption, stand still and age for 12 hours, then dry in an oven at 100°C for 24 hours, move to a roasting furnace, and roast in an air atmosphere. The method is as shown in Example 1, and 10% CuO-4% La can be obtained 2 o 3 / SiO 2 (by weight CuO:La 2 o 3 5:2) catalyst.

[0030] Prepare 20%NiO-4%La by implementing the method of 4 2 o 3 / SiO 2 (by weight NiO:La 2 o 3 is 5:1) the catalyst is Example 5.

[0031] Prepare 20% Co with the method of implementing 4 2 o 3 -4% La 2 o 3 / SiO 2 (by weight Co 2 o 3 : La 2 o 3 is 5:...

Embodiment 7

[0033] The evaluation of the combustion activity of all catalysts for chlorobenzene was carried out in a fixed-bed micro-reactor (quartz with an inner diameter of 6 mm), the amount of catalyst used was 200 mg, and the temperature was automatically controlled by a K-type thermocouple. Chlorobenzene is injected into the vaporization chamber by the 100 series KDS120 micro-injection pump of Stoelting Company in the United States, and then mixed with dry air and moist air with a water concentration of 5vol% respectively into the reactor for combustion. The total flow is controlled by a mass flow meter, the concentration of chlorobenzene is controlled at 0.1vol%, the amount of exhaust gas treated per gram of catalyst per hour is 15L, and the linear velocity of gas passing through the reactor is 120m / h. Reaction pressure is 0.1Mpa, and the relation of the conversion ratio of chlorobenzene and temperature of reaction is shown in Table 1, and T in the table 10％ , T 50％ , T 98％ are th...

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Abstract

The invention discloses a method used for fully catalysing, burning and eliminating volatile pollutants such as aromatic hydrocarbon chloride in the environment. The invention takes a transition metal oxide and a rare earth oxide loaded by alumina, silica and zirconia as a catalyst which is then brought into a reactor by the air which is taken as oxidant; the chlorine-containing volatile aromatic hydrocarbon is completely combusted under the action of the catalyst and is then converted into carbon dioxide, hydrogen chloride and chlorine; the tail gas which has been completely burned can be absorbed by a diluted alkali solution (acid gases such as hydrogen chloride / chlorine, etc.) and are emptied then. The catalyst which is used by the method of the invention has high activity, generates no by-product, causes no secondary pollution, has strong chlorine poisoning resistance and long service life of catalyst, which is especially suitable for completely catalysing, burning and eliminating chlorine-containing organic compounds under low temperature, more particularly the pollutants of volatile chlorine-containing aromatic hydrocarbons.

Description

technical field [0001] The invention belongs to the technical field of catalytic combustion environmental protection, and particularly relates to a method for eliminating volatile chlorinated aromatic hydrocarbons at low temperature by catalytic combustion. 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 dichlorobenzene, and chlorinated non-aromatic aliphatic hydrocarbons, such as dichloroethane, trichloroethylene, tetrachloroethylene, methyl chloride and polychloromethane etc. The former is produced in bleaching of w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/07B01J23/83B01J23/34B01J23/10
Inventor 王幸宜李到康乾
Owner EAST CHINA UNIV OF SCI & TECH
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