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Metallic oxide mixture catalyzer for purifying organic waste gas and method of preparing the same

An organic waste gas and oxide technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc. Simple manufacturing equipment, simple preparation process and low light-off temperature

Active Publication Date: 2008-03-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To improve this stability, Al 2 o 3 Precursor water solubles, that is, slurry, are generally prepared very thinly, and have to be coated and dried many times, and the process is complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Measure 100 milliliters of nitric acid solution with a concentration of 10%, and heat it to boil with an induction cooker. Take a cordierite honeycomb ceramic with a size of 30 mm (diameter) * 50 mm (height), and its specification is 300 holes / inch 2 (47 holes / cm 2 ), weighed its weight to be 29.1801 grams, put it into the boiled nitric acid solution, and continue heating for 3 hours. The cordierite honeycomb ceramics were taken out, rinsed with pure water to pH=6-7, dried in air at 200° C. for 2 hours, and allowed to cool naturally.

[0030] Weigh 1.0213 g of alumina sol with a purity of 60%, add 7 ml of pure water, and stir to completely dissolve the alumina sol. In addition, 2.1686 grams, 2.6102 grams and 1.3061 grams of purity were weighed respectively to be 98% Cu (NO 3 ) 2 , Ni(NO 3 ) 2 and Co(CH 3 COO) 2 , 1.5294 g of 50% Mn(NO 3 ) 4 , dissolved and stirred until uniform to form mixed salt solution A. Then weigh 0.2366 grams, 0.0623 grams and 0.0102 gram...

Embodiment 2

[0036] The honeycomb ceramic carrier with the specifications described in Example 1 was weighed, and its weight was 30.0988 grams, and nitric acid intensive pretreatment was carried out according to the conditions and steps of Example 1.

[0037] Weigh 2.6336 g of alumina sol with a purity of 60%, add 7 ml of pure water, and stir to completely dissolve the alumina sol. In addition, 1.8349 grams, 1.4724 grams and 0.7368 grams of purity were weighed respectively to be 98% Cu (NO 3 ) 2 , Ni(NO 3 ) 2 and Co(CH 3 COO) 2 , 0.8628 grams of Mn(NO 3 ) 4 , dissolved and stirred until uniform to form mixed salt solution A. Then weigh 0.7322 grams, 0.2357 grams and 0.0342 grams of cerium lanthanum zirconium precursor Ce(NO 3 ) 3 ·6H 2 O, La(NO 3 ) 3 ·6H 2 O and ZrO(NO 3 ) 2 2H 2 O; aluminum glue and cerium-lanthanum-zirconium mixed salt are dissolved separately and then mixed to form coating slurry B, and finally mixed salt solution A is mixed with coating slurry B to form...

Embodiment 3

[0043] The honeycomb ceramic carrier with the specifications described in Example 1 was weighed, and its weight was 30.2645 grams, and nitric acid intensive pretreatment was carried out according to the conditions and steps of Example 1.

[0044] Weigh 3.1778 g of alumina sol with a purity of 60%, add 7 ml of pure water, and stir to completely dissolve the alumina sol. In addition, 1.7122 grams, 2.0608 grams and 1.5469 grams of purity were weighed respectively to be 98% Cu (NO 3 ) 2 , Ni(NO 3 ) 2 and Co(CH 3 COO) 2 , 1.2076 grams of 50% Mn(NO 3 ) 4 , dissolved and stirred until uniform to form mixed salt solution A. Then weigh 0.4786 grams, 0.1401 grams and 0.0447 grams of cerium lanthanum zirconium precursor Ce(NO 3 ) 3 ·6H 2 O, La(NO 3 ) 3 ·6H 2 O and ZrO(NO 3 ) 2 2H 2 O; aluminum glue and cerium-lanthanum-zirconium mixed salt are dissolved separately and then mixed to form coating slurry B, and finally mixed salt solution A is mixed with coating slurry B to ...

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PUM

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Abstract

The present invention relates to a catalyst of a metal oxide compound used for organic exhaust gas purification, and a preparation method for the catalyst. The catalyst uses the cordierite honeycomb ceramic intensively pretreated with the nitric acid as a carrier, and an active aluminum oxide coating modified by a mixed oxide of cerium, lanthanum and zirconium, and an active component comprising a plurality of metallic oxide mixtures are loaded on the carrier in a lump. For the catalyst preparation method, heat treatment is conducted on the carrier with the nitric acid, the concentration of which is 5 to 15 percent; after a specific surface area of the carrier is increased, the coating, which comprises and is loaded with the mixed oxide active component, is immersed in a lump. The catalyst is provided with the large specific surface area. The active component is a transition metal oxide mixture, which comprises no noble metal. Moreover, the catalyst is provided with the excellent performance and the low cost, and can be spread and applied easily. The catalyst is provided with the high catalytic combustion efficiency for the organic exhaust gas comprising benzene, toluene, dimethybenzene, polycyclic aromatic hydrocarbon and so on, and the ignition temperature is low. Thus, the catalyst is widely applicable for purification of the industrial organic exhaust gas. The technique of one-time immersion, drying and calcination is adopted, so the manufacture equipment needed is simple.

Description

technical field [0001] The invention relates to a catalyst for purifying organic waste gas and a preparation method thereof, in particular to a metal oxide mixture catalyst for purifying organic waste gas and a preparation method thereof. Background technique [0002] The organic waste gas discharged from industry is one of the main sources of air pollution. For example, the organic waste gas discharged from enameled wire production contains benzene, toluene, xylene and polycyclic aromatic hydrocarbons, etc.; the organic waste gas discharged from the automobile coating process contains not only xylene, but also Contains trimethylbenzene and tetramethylbenzene, etc. If these exhaust gases are discharged directly without treatment, they will cause great harm to human health. At present, the treatment methods used for these organic waste gases include absorption method, thermal combustion method and catalytic combustion method. Among them, the catalytic combustion method can ...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/44
Inventor 叶代启付名利关绣娟
Owner SOUTH CHINA UNIV OF TECH
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