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Preparation method of catalyst for catalytic combustion of organic exhaust gas

A catalytic combustion and catalyst technology, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve complex problems such as easy cracking of coatings, peeling off, and large differences in hardness, etc., to achieve improvement Dispersion performance, avoiding the decline of mechanical strength, and the effect of not falling off easily

Active Publication Date: 2013-01-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ball milling pulping process is relatively complicated, and the hardness of different components is quite different. After ball milling, the particle size distribution of the particles in the slurry is relatively wide, and the particle size is relatively large, generally between 1 and 50 μm. The coating is easy to crack and peel off

Method used

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  • Preparation method of catalyst for catalytic combustion of organic exhaust gas
  • Preparation method of catalyst for catalytic combustion of organic exhaust gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Pretreatment of the honeycomb ceramic substrate: at 20°C, put the honeycomb ceramic substrate into a nitric acid solution with a concentration of 5% by mass, ultrasonically treat the honeycomb ceramic substrate for 80 minutes, and dry it at 100°C for 12 hours after pretreatment. Ultrasonic radiation power is 2 W / ml pretreatment liquid.

[0040] Slurry preparation: 50 grams of γ-alumina with a particle size of 50 nm, 10 grams of cerium-zirconium oxide with a particle size of 80 nm (Ce / Zr ratio of 1:20) and 20 grams of aluminum sol with a particle size of 80 nm were added to 100 mL of distilled water stirred at high speed After stirring evenly, add 5 grams of triethylenediamine and continue stirring for 30 minutes; add nitric acid to adjust the pH value of the slurry to 4, and continue stirring for 60 minutes to obtain the slurry.

[0041] Coating loading: immerse the pretreated cordierite honeycomb ceramic carrier in the slurry prepared above, take it out, blow off the r...

Embodiment 2

[0045] Pretreatment of the honeycomb ceramic substrate: at 80°C, put the honeycomb ceramic substrate into an oxalic acid solution with a mass percent concentration of 50%, ultrasonically treat the honeycomb ceramic substrate for 10 minutes, and dry it at 120°C for 6 hours after pretreatment. Ultrasonic radiation power is 10 W / ml pretreatment liquid.

[0046] Slurry preparation: 30 grams of γ-alumina with a particle size of 20 nm, 5 grams of cerium-zirconium oxide with a particle size of 50 nm (Ce / Zr ratio of 1:10) and 15 grams of aluminum sol with a particle size of 80 nm were added to 100 mL of distilled water stirred at high speed After stirring evenly, add 10 grams of isopropylamine and continue stirring for 30 minutes; add nitric acid to adjust the pH value of the slurry to 3.5, and continue stirring for 60 minutes to obtain the slurry.

[0047] Coating loading: immerse the pretreated cordierite honeycomb ceramic carrier in the slurry prepared above, take it out, blow off ...

Embodiment 3

[0051] Pretreatment of the honeycomb ceramic substrate: at 50°C, put the honeycomb ceramic substrate into a hydrochloric acid solution with a concentration of 15% by mass, ultrasonically treat the honeycomb ceramic substrate for 100 minutes, and dry it at 110°C for 12 hours after pretreatment. Ultrasonic radiation power is 0.1 W / ml pretreatment liquid.

[0052] Slurry preparation: 25 grams of γ-alumina with a particle size of 100 nm, 30 grams of cerium-zirconium oxide with a particle size of 120 nm (Ce / Zr ratio of 1:1) and 25 grams of aluminum sol with a particle size of 80 nm were added to 100 mL Distilled water with high-speed stirring; after stirring evenly, add 8 grams of isopropylamine and continue stirring for 30 minutes; add nitric acid to adjust the pH value of the slurry to 3.5, and continue stirring for 60 minutes to obtain the slurry.

[0053] Coating loading: immerse the pretreated cordierite honeycomb ceramic carrier in the slurry prepared above, take it out, blow...

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Abstract

The invention discloses a preparation method of a catalyst for catalytic combustion of organic exhaust gas. The method comprises the following steps of: firstly carrying out ultrasonic pretreatment on a honeycomb ceramic matrix in a pretreatment fluid, then loading a nanometer slurry coating, and finally loading an auxiliary agent and a precious metal active component. The catalyst obtained by the adoption of the method has high bonding degree between the coating and the matrix, and is not easy to crack and spall. Therefore, the catalyst has good service performance and good active stability. Even under scouring and thermal shock of an air flow at high space velocity, the catalyst can still maintain high activity so as to guarantee long-term stable operation of the catalyst.

Description

[0001] technical field [0002] The invention relates to a catalyst for catalytic combustion of organic waste gas and a preparation method thereof, in particular to a catalyst for catalytic combustion of volatile organic compounds and a preparation method thereof. [0003] Background technique [0004] Volatile organic compounds (VOCs) refer to organic compounds with a saturated vapor pressure greater than 70Pa at normal temperature and a boiling point within 260°C at normal pressure, such as aliphatic hydrocarbons, aromatic hydrocarbons, oxygen-containing organic compounds, halogen-containing organic compounds, nitrogen-containing organic compounds and Sulfur-containing organic matter, etc. Motor vehicle emissions, energy industry, fine chemicals, printing, coatings and other industries are the main sources of VOCs. [0005] VOCs have serious harm to the environment and human health: most VOCs have peculiar smell, damage certain organs of the human body, cause lesions, an...

Claims

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Application Information

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IPC IPC(8): B01J37/025B01J23/44B01D53/86B01D53/72
Inventor 王学海刘忠生陈玉香刘新友程明珠
Owner CHINA PETROLEUM & CHEM CORP
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