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A kind of preparation method of PD-based catalytic combustion honeycomb ceramic catalyst

A technology of honeycomb ceramics and catalytic combustion, which is applied in the direction of catalyst activation/preparation, combustion methods, physical/chemical process catalysts, etc. It can solve the problems of weak force of aluminum sol, insufficient bonding, complicated preparation process, etc., so as to achieve difficult migration, The tight effect

Active Publication Date: 2020-11-10
XIAN CATALYST NEW MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Fe-Mn / cordierite catalyst prepared by W.J.Ma et al. The ratio of Fe and Mn, loading and calcination temperature have a great influence on the performance of the catalyst. Under optimal conditions, the loading of Fe and Mn is 10%. The Fe / Mn molar ratio is 4:1, the calcination temperature is 500°C, and the conversion rate of toluene reaches 90% when the reaction temperature reaches 300°C. The removal effect of more than 99% cannot be achieved yet, and the activity of the catalyst needs to be improved
The amount of coating (cerium oxide and yttrium oxide) prepared by Fang Liling and others reached 10% of the mass of honeycomb ceramics. Increasing the amount of coating can effectively increase the specific surface area, which is conducive to the improvement of catalytic performance, but it is prepared by multiple coating methods. The coating may make the combination between the coating and the coating or between the coating and the honeycomb ceramic carrier not tight enough, which may cause the coating to fall off during subsequent processing and use, thereby reducing the activity of the catalyst
Chinese patent 200510062205.3 discloses a catalytic combustion catalyst, which mainly uses honeycomb ceramics as the carrier to support Ce-La-Mn-Zr-Ag-O composite oxide, which has better catalytic performance than the usual honeycomb ceramic catalytic combustion catalysts , the cost of the catalyst is low, but the catalyst contains a composite oxide of five elements, which requires multiple impregnation-drying steps, and the preparation process is more complicated
The conventional method of preparing alumina coating is to directly soak the honeycomb ceramics into a certain concentration of aluminum sol solution, and the aluminum sol is adsorbed to the surface of the carrier at one time. Since the inner and outer surfaces of the carrier are not treated and the inner and outer surfaces are smooth, the interaction with the aluminum sol is weak. In the subsequent drying process, it is easy to migrate with the evaporation of water, resulting in uneven distribution of alumina coating after firing

Method used

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  • A kind of preparation method of PD-based catalytic combustion honeycomb ceramic catalyst
  • A kind of preparation method of PD-based catalytic combustion honeycomb ceramic catalyst
  • A kind of preparation method of PD-based catalytic combustion honeycomb ceramic catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0024] 1. After wetting the cordierite honeycomb ceramics with deionized water, polish the inner and outer surfaces of the honeycomb ceramics with a nuclear magnetic tube brush with 200 mesh emery to make the originally smooth surface rough, and then grind the honeycomb ceramics at 100°C Let dry for 12 hours.

[0025] 2. Add 20g of pseudo-boehmite and 1g of hydroxymethylcellulose into 79g of deionized water, then dropwise add 0.1mL of acetic acid, and continue stirring for 2 hours to obtain an aluminum sol coating with a mass fraction of pseudo-boehmite of 20%. slurry.

[0026] Put 10g of the honeycomb ceramics treated in step 1 in a container with a stirring device, add 100g of deionized water to completely submerge the honeycomb ceramics, and start stirring. During the stirring process, the honeycomb ceramics are in a static state. The alumina sol coating slurry with a mass fraction of diaspore of 20% was continuously stirred for 60 minutes after the dropwise addition, and ...

Embodiment 2

[0029] 1. After wetting the cordierite honeycomb ceramics with deionized water, polish the inner and outer surfaces of the honeycomb ceramics with an NMR tube brush with 100 mesh emery to make the originally smooth surface rough, and then grind the honeycomb ceramics at 100°C Let dry for 12 hours.

[0030] 2. Add 20g of pseudo-boehmite and 2g of hydroxymethylcellulose into 78g of deionized water, then dropwise add 1mL of acetic acid, and continue stirring for 2 hours to obtain an alumina sol coating slurry with a mass fraction of pseudo-boehmite of 20%. .

[0031] Put 10g of the honeycomb ceramics treated in step 1 in a container with a stirring device, add 100g of deionized water to completely submerge the honeycomb ceramics, and start stirring. The alumina sol coating slurry with a mass fraction of diaspore of 20% was continuously stirred for 60 minutes after the dropwise addition, and the alumina sol and the honeycomb ceramics were adsorbed and evenly dispersed on the inner ...

Embodiment 3

[0034] 1. After wetting the cordierite honeycomb ceramics with deionized water, use an NMR tube brush with 300-mesh corundum to polish the inner and outer surfaces of the honeycomb ceramics to make the original smooth surface rough. Let dry for 12 hours.

[0035] 2. Add 20g of pseudo-boehmite and 1g of hydroxymethylcellulose into 79g of deionized water, then dropwise add 2mL of acetic acid, and continue stirring for 2 hours to obtain an alumina sol coating slurry with a mass fraction of pseudo-boehmite of 20%. .

[0036] Put 10g of the honeycomb ceramics treated in step 1 in a container with a stirring device, add 100g of deionized water to completely submerge the honeycomb ceramics, and start stirring. The alumina sol coating slurry with a mass fraction of diaspore of 20% was continuously stirred for 60 minutes after the dropwise addition, and the alumina sol and the honeycomb ceramics were adsorbed and evenly dispersed on the inner and outer surfaces of the honeycomb cerami...

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Abstract

The invention discloses a method for preparing a Pd-based catalytic combustion honeycomb ceramic catalyst. Firstly, the honeycomb ceramic carrier is sand-washed, and then an alumina coating is prepared by "in-situ growth", and finally the activity is loaded under stirring conditions. The component Pd is dried and calcined to prepare a Pd-based catalytic combustion honeycomb ceramic catalyst. Under the same conditions, compared with the catalyst prepared by the conventional impregnation method, the catalyst prepared by the method of the present invention has a higher specific surface area, better catalytic activity and stability, and can ‑1 , the concentration of toluene is 2~5g / m 3 Under certain conditions, the light-off temperature of toluene on the catalyst is lower than 235°C, and the removal rate of toluene reaches over 99%.

Description

technical field [0001] The invention belongs to the technical field of preparation of supported catalysts, and in particular relates to a method for preparing catalytic combustion honeycomb ceramic catalysts. Background technique [0002] Volatile organic compounds refer to organic compounds with a saturated vapor pressure greater than 133Pa at normal temperature and a boiling point between 50 and 260°C at normal pressure, or any organic solid or liquid that can volatilize at normal temperature and pressure. VOCs mainly come from industries such as petrochemical, organic chemical, paint and textile, and have strong hazards to human health. There are many ways to deal with VOCs, among which catalytic combustion technology is one of the most effective and economical methods. Catalytic combustion belongs to the gas-solid two-phase reaction, mainly the deep oxidation reaction of active oxygen on the surface of the catalyst and VOCs. Combustion technology, the products are main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J35/04B01J37/02B01J37/08F23G7/07
CPCF23G7/07B01J23/44B01J37/0217B01J37/088B01J35/399B01J35/56
Inventor 林涛张炳亮程杰万克柔曾永康曾利辉高武张之翔
Owner XIAN CATALYST NEW MATERIALS CO LTD