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Preparation method of monolithic catalyst for formaldehyde purification

An integrated catalyst and formaldehyde purification technology, applied in the field of ambient air purification, can solve the problems of no catalytic effect of precious metal components, limited utilization efficiency of precious metals, uneven distribution of precious metals, etc., to improve utilization efficiency, easy operation, and preparation technology. simple effect

Inactive Publication Date: 2017-07-18
HUIZHOU RES INST OF SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the fast volatilization of the solvent on the surface of the honeycomb structure and the slow volatilization of the solvent in the internal pores, the active components of the noble metal will migrate with the volatilization of the solvent, resulting in uneven distribution of precious metals between different pores of the honeycomb catalyst.
When the formaldehyde-containing waste gas flows through the low noble metal content area of ​​the monolithic catalyst, the formaldehyde leaves the bed without being completely converted, while the excess noble metal in the high noble metal content area cannot be converted due to the parallel channel characteristics of the monolithic catalyst itself. formaldehyde, causing some precious metal components to actually have no catalytic effect
The above phenomenon is difficult to avoid when the impregnation method is applied to the preparation process of monolithic catalysts. Therefore, the utilization efficiency of precious metals in monolithic honeycomb catalysts for formaldehyde purification prepared by impregnation methods is limited.

Method used

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  • Preparation method of monolithic catalyst for formaldehyde purification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 20g of pseudo-boehmite and 80g of alumina powder, add 300g of deionized water and mix, and adjust the pH to 4 with nitric acid. Take 250-mesh cordierite honeycomb ceramics with a volume of 50×50×50mm, immerse them in the above slurry, take them out, blow dry the residual liquid in the channels, dry them at 120°C, and calcinate at 550°C for 4 hours. The finally obtained cordierite honeycomb carrier whose surface is coated with an active coating. The test results are: the amount of coating on the surface of the carrier is 60g / L; the specific surface area of ​​the coating is 87m 2 / g; after the ultrasonic vibration test, the shedding rate of the carrier surface coating is less than 3%.

Embodiment 2

[0027] Weigh 20g of pseudoboehmite and 100g of alumina powder, add 300g of deionized water and mix, and adjust the pH to 4 with nitric acid. Take a 50-mesh stainless steel honeycomb carrier with a volume of 50×50×50mm, immerse it in the above slurry, take it out, blow dry the residual liquid in the channel, dry it at 120°C, and calcinate at 550°C for 4 hours. The final product is a stainless steel honeycomb carrier coated with an active coating on the surface. The test results are: the amount of coating on the surface of the carrier is 22g / L; the specific surface area of ​​the coating is 95m 2 / g; after the ultrasonic vibration test, the shedding rate of the carrier surface coating is less than 3%.

Embodiment 3

[0029] Weigh H separately 2 PtCl 6 0.0523g, Fe(NO 3 ) 3 0.0647g, Ni(NO 3 ) 2 0.0249g, use deionized water to dissolve the above-mentioned salt solution to a volume of 125mL, then add the honeycomb carrier coated with a solid active coating on the surface prepared according to Example 1, keep it for about 5 hours, and take it out. It is evenly immobilized on the surface of the active coating, and the remaining solution that does not contain active ingredients is removed. Then prepare a 0.1 mol / L sodium borohydride solution, immerse the catalyst, take it out, and dry it to obtain a formaldehyde purification catalyst with a cordierite honeycomb as a carrier. After testing, the catalyst contains 0.2g / L of Pt element, 0.12g / L of Fe element and 0.06g / L of Ni element.

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Abstract

The invention discloses a preparation method of a monolithic catalyst for formaldehyde purification. The preparation method comprises the following steps: (1) preparing a monolithic honeycomb substrate having an adsorption and immobilization activity coating; (2) keeping the monolithic honeycomb substrate having the adsorption and immobilization activity coating in contact with a solution containing a noble metal salt and a transition metal salt, so that active components in the solution are adsorbed to the surface of the honeycomb composite material; and (3) reducing with a reducer to obtain the monolithic catalyst for formaldehyde purification. Monolithic honeycomb ceramic / honeycomb stainless steel is used as the substrate, and the active components are loaded by an adsorption method, so that the active components are distributed uniformly, the utilization rate of the noble metal is high, and the preparation process is simple, easy to operate and good in repeatability. Formaldehyde can be completely catalytically oxidized into innocuous and nonpoisonous carbon dioxide and water at room temperature under the condition of low loading quantity of the noble metal, the decomposition speed is high and the service life is long.

Description

technical field [0001] The invention relates to the field of ambient air purification, in particular to a method for preparing an integral catalyst for formaldehyde purification. Background technique [0002] With the deepening of urbanization in my country, formaldehyde pollution in ambient air has gradually become the main factor that endangers the health of residents. Formaldehyde is widely used in construction materials, the main component of glue adhesives in furniture. Long-term exposure to ambient air containing high concentrations of formaldehyde can cause various acute and chronic lesions in human tissues such as the respiratory tract and skin. The development of efficient indoor formaldehyde removal technology is of great significance to promote the urbanization process of our country. Compared with common formaldehyde purification technologies such as photocatalysis and plasma purification on the market that require additional input energy and have unstable remo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04B01J21/06B01J23/89B01J23/42B01D53/86B01D53/72
Inventor 纪红兵霍颖陈家枢芮泽宝
Owner HUIZHOU RES INST OF SUN YAT SEN UNIV
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