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A monolithic catalyst for catalytic combustion of toluene waste gas and preparation method thereof

A monolithic catalyst and catalytic combustion technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of low catalytic activity and easy deactivation, and achieve The preparation process is simple, the utilization efficiency is improved, and the effect of a wide range of raw material sources

Inactive Publication Date: 2012-02-01
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem: The purpose of the present invention is to provide a catalytic combustion copper catalyst for treating toluene waste gas in view of the shortcomings of low catalytic activity and easy deactivation of the current organic waste gas combustion catalysts that use non-noble metal oxides as active components. / manganese / silver composite oxide monolithic catalyst and preparation method thereof

Method used

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preparation example Construction

[0023] The preparation method of catalytic combustion catalyst of the present invention comprises:

[0024] (1) Preparation of the coating slurry, the specific process is: take an appropriate amount of pseudo-boehmite powder and add an appropriate amount of deionized water, the solid content is 40-60wt.%. Stir vigorously at 80°C for 1 h, and adjust the pH value to 2-4 with nitric acid. Stand to room temperature to form a uniform and stable aluminum sol with high solid content and good fluidity.

[0025] (2) The coating of the carrier, the specific process is: soak the honeycomb ceramic carrier in the above slurry for a period of time at room temperature and then take it out, then remove the excess liquid in the channels by air purging, and then perform post-treatments such as drying and roasting , resulting in monolithic supports with robust coatings.

[0026] (3) Preparation and loading of active component impregnation solution. Prepare copper / manganese / silver nitrate mixe...

Embodiment 1

[0030] (1) Preparation of impregnation solution

[0031] Weigh 0.0232g AgNO 3 , 0.3063g Mn(NO 3 ) 2 and 0.2063g Cu(NO 3 ) 2 ·3H 2 O Add 0.2ml of deionized water and shake fully to dissolve the three metal nitrates completely.

[0032] (2) Preparation of coating slurry

[0033] Weigh 40 g of pseudo-boehmite into a three-neck flask, add 100 ml of deionized water, adjust the pH value to 2.5 with nitric acid in a constant temperature water bath at 80° C., and stir vigorously for 1 h. Take out the colloid and let it stand to cool to room temperature, that is to say, an aluminum sol with high solid content and good fluidity can be obtained.

[0034] (3) Coating of active coating on honeycomb ceramic carrier

[0035] Dip the cordierite ceramic carrier with a size of Φ8×24 mm and a pore density of 400 cpsi into the coating slurry and keep stirring for 1 minute, then take it out slowly. The excess liquid in the channels was removed by air blowing, then dried at 110°C for 1 hou...

Embodiment 2

[0042] (1) Preparation of impregnation solution

[0043] Weigh 0.0239g AgNO 3 , 0.3146g Mn(NO 3 ) 2 and 0.2119g Cu(NO 3) 2 ·3H 2 O Add 0.2ml of deionized water and shake fully to dissolve the three metal nitrates completely.

[0044] (2) Preparation of coating slurry

[0045] Weigh 50 g of pseudo-boehmite into a three-neck flask, add 100 ml of deionized water, adjust the pH to 3 with nitric acid in a constant temperature water bath at 80° C., and stir vigorously for 1 h. Take out the colloid and let it stand to cool to room temperature, that is to say, an aluminum sol with high solid content and good fluidity can be obtained.

[0046] (3) Coating of active coating on honeycomb ceramic carrier

[0047] Dip the cordierite ceramic carrier with a size of Φ8×24mm and a pore density of 400cpsi into the coating slurry and keep stirring for 2min, then take it out slowly. The excess liquid in the channels was removed by air blowing, then dried at 120 °C for 1 h, and then calci...

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Abstract

The invention relates to an integral catalyst used for the catalytic combustion of toluene waste gas and a preparation method thereof. The catalyst is composed of a honeycomb ceramic carrier, a gamma-Al2O3 coating and a non-noble metal copper / manganese / silver composite oxide. The preparation process of the catalyst is as follows: the alumina sol is coated on the cordierite honeycomb ceramic carrier, and the gamma-Al2O3 coating is formed after drying and roasting. Weighing appropriate amount of nitrates of silver, copper and manganese to prepare a mixed solution, load it on the monolithic carrier coated with active coating by equal volume impregnation method, and obtain monolithic catalyst through post-treatment such as drying and roasting. The light-off temperature of this catalyst for toluene can be lower than 135°C, and the complete conversion temperature is lower than 262°C. Compared with the commonly used noble metal catalysts, the monolithic catalyst prepared by the invention not only has high catalytic activity, but also the active components are loaded by an equal volume impregnation method, so the effective utilization rate is high and the cost is greatly reduced.

Description

technical field [0001] The invention relates to a copper / manganese / silver composite oxide integral catalyst, in particular to a catalytic combustion integral catalyst for treating toluene waste gas and a preparation method thereof. Background technique [0002] Toluene is a typical volatile organic pollutant, which mainly comes from petrochemical, pharmaceutical, printing and painting industries. Toluene is highly toxic and has an unpleasant smell. It is a strong carcinogen and is harmful to the central nervous system and the respiratory system. If you work in an environment containing even a small amount of toluene vapor for a long time, your body will be seriously damaged. . As an effective treatment method for organic waste gas, catalytic combustion has the advantages of being able to treat low-concentration organic waste gas and not producing harmful by-products. In the catalytic combustion process, monolithic structured catalysts are usually used. Compared with granu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89B01J23/889B01D53/72B01D53/86
Inventor 吴东方蒋玮周建成
Owner SOUTHEAST UNIV
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