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Preparation method of catalytic combustion catalyst

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 the problems of complex preparation process, easy cracking of coating, large amount of additives, etc., and achieve the goal of preparation The process is simple, not easy to crack, and the effect of less additives

Active Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] We found that the above catalysts are all prepared by slurry dipping method to prepare coatings. The slurry method preparation process is more complicated, and the particle size of the particles in the ball mill slurry needs to be strictly controlled, and the obtained coatings are easy to crack and peel off.
In order to improve the thermal stability and catalyst activity of the coating, it is usually necessary to add CeO to the coating 2 , ZrO 2 , La 2 o 3 Additives such as additives, the additives in the coating prepared by the slurry method are often embedded in the coating, so the amount of additives is large

Method used

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  • Preparation method of catalytic combustion catalyst
  • Preparation method of catalytic combustion catalyst
  • Preparation method of catalytic combustion catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Pretreatment of the honeycomb ceramic substrate: the cordierite honeycomb ceramic substrate was hydrothermally treated at 40°C for 24 hours, and then dried at 100°C for 12 hours.

[0031] Aluminum sol preparation: 25 grams of pseudo-boehmite was added to 200 mL of deionized water, and 10 g of concentrated nitric acid was added dropwise while stirring. After stirring for a certain period of time, heat to 80°C, add nitric acid dropwise until completely peptized, control the pH value of the solution at 2-5, and age for 24 hours to obtain a transparent aluminum sol.

[0032] Coating loading: immerse the pretreated cordierite honeycomb ceramic carrier in the above-prepared aluminum sol, take it out, blow off the residual liquid, dry at 120°C for 6 hours, and bake at 500°C for 5 hours.

Embodiment 2

[0034] Pretreatment of the honeycomb ceramic substrate: the cordierite honeycomb ceramic substrate was hydrothermally treated at 80°C for 6 hours, and then dried at 110°C for 6 hours.

[0035] Aluminum sol preparation: same as embodiment 1.

[0036] Coating loading: immerse the pretreated cordierite honeycomb ceramic carrier in the above-prepared aluminum sol, take it out, blow off the residual liquid, dry at 40°C for 12 hours, and bake at 600°C for 1 hour.

Embodiment 3

[0038] Pretreatment of the honeycomb ceramic substrate: the cordierite honeycomb ceramic substrate was hydrothermally treated at 120° C. for 4 hours, and then dried at 110° C. for 10 hours.

[0039] Aluminum sol preparation: 20 grams of pseudoboehmite was added to 150 mL of deionized water, and 8 grams of concentrated nitric acid was added dropwise while stirring. After stirring for a certain period of time, heat to 80°C, add nitric acid dropwise until completely peptized, control the pH value of the solution at 2-5, and age for 24 hours to obtain a transparent aluminum sol.

[0040] Coating loading: immerse the pretreated cordierite honeycomb ceramic carrier in the above-prepared aluminum sol, take it out, blow off the residual liquid, dry at 100°C for 10 hours, and bake at 500°C for 5 hours.

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Abstract

The invention discloses a preparation method of a catalytic combustion catalyst. The method comprises the following steps: firstly, performing hydrothermal pretreatment on a honeycomb ceramic matrix; secondly, soaking the honeycomb ceramic matrix with alumina sol; and finally, loading additives and precious metal active components. The catalyst coating obtained by the method of the invention has high bonding degree with the matrix, is difficult to crack and peel off and has less dosage of additives. Thus, the catalyst has good operational performance and activity stability and can maintain higher activity under the scouring of high space velocity airflow and thermal shock, so that the long-term stable operation of the catalyst can be ensured.

Description

technical field [0001] The invention relates to a catalytic combustion catalyst and a preparation method thereof, in particular to a catalyst for catalytic combustion of volatile organic compounds and a preparation method thereof. Background technique [0002] 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. [0003] VOCs have serious harm to the environment and human health: most VOCs have peculiar smell, damage certain organs of the human body, cause lesions, and even cause cancer; VOCs react photochemica...

Claims

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Application Information

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IPC IPC(8): B01J37/00B01J37/10B01J23/63B01J23/44B01D53/72B01D53/86
Inventor 王学海刘忠生陈玉香刘新友程明珠杨英
Owner CHINA PETROLEUM & CHEM CORP
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