Preparation method of rare earth composite oxides coating Pt-supported catalyst

A technology of oxide coating and rare earth compounding, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., which can solve the problem of easy peeling off of coating and thermal stability of coating In order to achieve the effects of high effective utilization rate, environmental protection and good catalytic performance

Inactive Publication Date: 2007-08-01
ZHEJIANG NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to aim at above-mentioned traditional Al 2 o 3 The thermal stability of the coating is poor, and it is easy to react with the carrier or additives to form spinel compounds, Al 2 o 3 The disadvantage that the coating is easy to fall off provides a method for preparing a catalyst that directly loads a rare earth composite oxide coating on a honeycomb ceramic carrier to support Pd

Method used

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  • Preparation method of rare earth composite oxides coating Pt-supported catalyst

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Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of coating: Weigh out 1.08 g of self-made Ce(OH) 3 , 0.32g Y 2 O 3 and 1.78g of citric acid, after mixing, add an appropriate amount of deionized water to dissolve, to obtain a coating liquid. The size is 50mm×25mm×40mm, and the aperture rate is 195cell / in 2 , after the cordierite honeycomb ceramic with a mass of 25.81g is immersed in the coating solution, take it out, blow out the residual liquid in the honeycomb channel, air the cordierite honeycomb ceramic at room temperature until the surface is dry, then dry at 120 ° C for 1 hour, and then put it in a muffle furnace calcined at 500 °C for 4 hours to obtain Ce 0.8 Y 0.2 O 1.9 coating.

[0019] Pd loading: prepare H with a concentration of 8.9 gPd / L solution 2 PdCl 4 Aqueous solution 100mL is used as the impregnation solution of precious metal active components. Measure 1.5mL H 2 PdCl 4 The aqueous solution is diluted with deionized water until the honeycomb ceramic carrier is just immersed, an...

Embodiment 2

[0022] Preparation of coating: Weigh 1.30g Ce(OH) 4 , 0.36g Y 2 O 3 and 1.97g of citric acid, add an appropriate amount of deionized water after mixing, and stir evenly to obtain a coating solution. The size is 50mm×25mm×40mm, and the aperture rate is 195cell / in 2 , after the cordierite honeycomb ceramic with a mass of 28.66g is immersed in the coating solution, take it out, blow out the residual liquid in the honeycomb channel, air the cordierite honeycomb ceramic at room temperature until the surface is dry, then dry it at 120 ° C for 1 hour, and then put it in a muffle furnace calcined at 500 °C for 4 hours to obtain Ce 0.8 Y 0.2 O 1.9 coating.

[0023] Loading of Pd: measure 1.6 mL of H according to the method of implementation 1 2 PdCl 4 Aqueous solution, adsorption, drying and calcination to obtain Pd / Ce 0.8 Y 0.2 O 1.9 catalyst.

[0024] Performance evaluation of the catalyst: according to the method of Example 1, the T of the catalyst 95 250℃

Embodiment 3

[0026] Preparation of coating: Weigh 1.47g La(OH) 3 , 0.17g CeO 2 and 1.83g of citric acid, after mixing, add an appropriate amount of deionized water to dissolve, to obtain a coating solution. The size is 50mm×25mm×40mm, and the aperture rate is 195cell / in 2 , after the cordierite honeycomb ceramic with a mass of 28.54g is immersed in the coating solution, take it out, blow out the residual liquid in the honeycomb channel, air the cordierite honeycomb ceramic at room temperature until the surface is dry, then dry at 120 ° C for 1 hour, and then put it in a muffle furnace calcined at 500 °C for 4 hours to obtain Ce 0.2 La 0.8 O 1.6 coating.

[0027] Loading of Pd: measure 1.6 mL of H according to the method of implementation 1 2 PdCl 4 Aqueous solution, adsorption, drying and calcination to obtain Pd / Ce 0.2 La 0.8 O 1.6 catalyst.

[0028] Performance evaluation of the catalyst: according to the method of Example 1, the T of the catalyst 95 is 280°C.

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Abstract

The invention involves environmental protect technology field, particularly a rare earth compound oxide covering load Pd catalyst preparation method used for organic waste gas treatment. The invention aims at: because the covering of the existing honeycomb ceramics carrier catalyst is easy to reacting with carrier or adjuvant and generating spinel compounds and the covering is easy to drop, the method provides a preparation method which preparation art is simple, does not generate harmful substances in the preparation process, covering has strong adsorption capacity to Pd and is combine with honeycomb ceramics carrier firmly. The preparation method is: adding organic acid or ethandiol or mixture of said both into certain amount of the third and fourth subgroup metal oxide or hydroxide and mixing uniformly and preparing the covering liquid, immersing the honeycomb ceramics carrier into covering liquid and getting it out, then airing, drying and roasting it to preparing the carrier with covering; then immersing the carrier with covering into prepared H2PdCl4 solution, preparing the accelerant after drying and roasting.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a preparation method of a rare earth composite oxide coating-supported Pd catalyst for organic waste gas treatment. Background technique [0002] Among the organic waste gas purification and treatment methods, catalytic combustion technology, as a simple and practical organic waste gas purification technology, has been paid more and more attention. The core of catalytic combustion technology is catalyst. Therefore, the development of catalysts with excellent performance has become the key to the development of this technology. [0003] Most of the existing catalysts adopt a honeycomb structure, that is, a cordierite honeycomb ceramic is used as a matrix, a coating is applied on it as a carrier, and then active components are loaded. The coating is the key part of the catalyst. If the bonding strength between the carrier and the coating is low, the coating will c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J23/63B01J35/04B01J37/02B01D53/34
Inventor 罗孟飞金凌云谢云龙何迈
Owner ZHEJIANG NORMAL UNIVERSITY
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