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Catalyst for eliminating chlorinated aromatic hydrocarbons by low-temperature catalytic combustion

A technology of chlorinated aromatic hydrocarbons and low-temperature catalysis, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, combustion methods, etc., can solve the problem of easy loss of catalyst active components and low catalytic combustion activity , short catalyst life and other problems, to achieve the effect of convenient and practical technical route, high catalytic activity and strong resistance to chlorine poisoning

Inactive Publication Date: 2009-01-21
EAST CHINA UNIV OF SCI & TECH
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  • 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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  • Catalyst for eliminating chlorinated aromatic hydrocarbons by low-temperature catalytic combustion
  • Catalyst for eliminating chlorinated aromatic hydrocarbons by low-temperature catalytic combustion

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Commercially available 4.1g cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O), 4.3g lanthanum nitrate (La(NO 3 ) 3 ·6H 2 O), 680.4g aluminum nitrate (Al(NO 3 ) 3 ·6H 2 O) into 40.9g manganese nitrate (Mn(NO 3 ) 2 ) 50wt% aqueous solution, add deionized water to make the volume of the solution reach 350ml, dissolve at room temperature, add 100g citric acid, and make it dissolve. Place the solution in a constant temperature water bath at 80°C and stir for 6-7 hours; then put it in a drying oven at 110°C for 12 hours, move it to a roasting furnace, and program the temperature in the air atmosphere, 4.2°C per minute, rising to 550°C, Keep warm for 5 hours to get 17.6% Mn 2 o 3 -1.2% CeO 2 -1.2% La 2 o 3 -80%Al 2 o 3 catalyst. Tablet crushing 20-40 mesh particles, ready to use.

[0025] Prepare 16% Fe by implementing the method of 1 2 o 3 -2%CeO 2 -2% La 2 o 3 -80%Al 2 o 3 The catalyst is Example 2.

[0026] Prepare 16% Mn by implementing the method of 1 2 o 3...

Embodiment 6

[0030] Commercially available 8.2g cerium nitrate (Ce(NO 3 ) 3 ·6H 2 O), 680.4g aluminum nitrate (Al(NO 3 ) 3 ·6H 2 O) into 40.9g manganese nitrate (Mn(NO 3 ) 2 ) 50wt% aqueous solution, add deionized water to make the volume of the solution reach 350ml, dissolve at room temperature, add 100g citric acid, and make it dissolve. Place the solution in a constant temperature water bath at 80°C and stir for 6-7 hours; then put it in a drying oven at 110°C for 12 hours, move it to a roasting furnace, and program the temperature in the air atmosphere, 4.2°C per minute, rising to 550°C, Keep warm for 5 hours to get 17.6% Mn 2 o 3 -2.4% CeO 2 -80%Al 2 o 3 catalyst.

[0031] Prepare 16%NiO-4%CeO with the method of implementation 6 2 -80%Al 2 o 3 The catalyst is Example 7.

[0032] Prepare 16% Co by implementing the method of 6 2 o 3 -4%CeO 2 -80%Al 2 o 3 The catalyst is Example 8.

Embodiment 9

[0034] Catalyst activity evaluation was carried out in a fixed bed reactor. The chlorobenzene combustion activity tests of all catalysts were carried out in a U-shaped quartz micro-reactor (inner diameter 6 mm), the amount of catalyst 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 air and then enters 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 reaction temperature is shown in Table 1, and T in Table 1 10％ , T 50％ , T 98％ are the reaction temperatures...

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Abstract

The invention discloses a catalyst used for the removal of volatile chlorination aromatic hydrocarbon by lower-temperature catalytic combustion; the catalyst is essentially composed of alumina carrier and rare earth oxide and transition metal oxide loaded on the alumina carrier; wherein, transition metal elements are Cu, Fe, V, Mn, Mo, Co and W, and the rare earth oxide is one or a plurality of lanthana, cerium oxide, neodymia and gadolinium oxide. The catalyst of the invention has high activity, no byproduct generated, no secondary pollution, strong capacity of chlorine poisoning resistance and long service life and is especially suitable for removing halogen-containing organic compounds by lower-temperature catalytic combustion, more particularly, volatile chlorine-containing aromatic hydrocarbon pollutants.

Description

technical field [0001] The invention belongs to the technical field of catalytic combustion environmental protection, and in particular relates to a transition metal-rare earth composite oxide catalyst and a preparation method thereof for the low-temperature catalytic combustion elimination of volatile chlorinated aromatic hydrocarbons, and provides a method for A method for completely catalytic combustion to eliminate volatile chlorinated aromatic hydrocarbon pollutants in the environment. Background technique [0002] Environmental pollution, especially the increasing air pollution, is one of the most concerned issues in the 21st century. In addition to SOx, NOx, ozone, and hydrocarbons, dioxin-like compounds (polychlorinated dibenzo-p-dioxins, PCDDs) have persistent pollution to the environment. The harm of dioxin-like compounds is not only to human health, but also to cause lasting and cumulative effects on biological systems, and to destroy atmospheric ozone. In the I...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J23/10B01J23/83F23G7/06B01D53/70A62D3/38
Inventor 王幸宜李到戴宇吴勐
Owner EAST CHINA UNIV OF SCI & TECH
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