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Carried by CeO2 based composite oxides coated carrier Pd catalyst, its preparation method

A composite oxide and catalyst technology, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. It can solve the problem of easy peeling off of the coating and poor thermal stability of the coating, etc. Problems, to achieve the effect of not easy to fall off, strong adhesion, thermal stability and anti-sintering

Inactive Publication Date: 2008-06-04
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is aimed at the existing 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 Coating is easy to fall off and other defects, using CeO 2 Based on the high oxygen storage performance and high temperature sintering resistance of the base composite oxide, it provides a method for loading CeO on the honeycomb ceramic carrier. 2 A catalyst based on a composite oxide coating and a preparation method thereof. The catalyst of the present invention has the advantages that the coating and the honeycomb ceramic carrier skeleton are firmly bonded, the coating is not easy to fall off during use, and the effective utilization rate of precious metals is high, and the catalytic performance and high temperature resistance are good. advantage

Method used

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  • Carried by CeO2 based composite oxides coated carrier Pd catalyst, its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 10.67g Ce(NO 3 ) 3 ·6H 2 O and 7.98g 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 opening rate is 195cell / in 2 , with a mass of 31.41g cordierite honeycomb ceramics immersed in the coating liquid, take it out, blow out the residual liquid in the honeycomb channel, at this time there is still part of the coating liquid remaining, air the cordierite honeycomb ceramics at room temperature to 50°C until the surface is dry, and then Dry at 120°C for 1 hour, then bake in a muffle furnace at 500°C for 1 hour. Repeat the above process 2 to 3 times until the coating solution is completely impregnated and adsorbed, and finally baked in a muffle furnace at 500 ° C for 4 hours to obtain CeO 2 coating.

[0018] The preparation concentration is the H of 8.9g Pd(1g / L) / L solution 2 PdCl 4 100mL of aqueous solution is used as the impregnation solution of precious metal a...

Embodiment 2

[0020] Weigh 0.57g Y 2 o 3 Join HNO 3 , with 9.16g Ce(NO 3 ) 3 ·6H 2 O and 5.35g of citric acid are mixed and added with an appropriate amount of deionized water, and stirred evenly to obtain a coating solution. The size is 50mm×25mm×40mm, and the opening rate is 195cell / in 2 , with a mass of 31.40g cordierite honeycomb ceramics immersed in the coating solution, take it out, blow out the residual liquid in the honeycomb channel, air the cordierite honeycomb ceramics at room temperature to 50°C until the surface is dry, then dry at 120°C for 1 hour, and then Baked in a furnace at 500°C for 1 hour. Repeat the above process 2 to 3 times until the coating solution is completely impregnated and adsorbed, and finally baked in a muffle furnace at 500 ° C for 4 hours to obtain Ce 0.8 Y 0.2 o 1.9 coating.

[0021] Measure 5.6mL H 2 PdCl 4 The aqueous solution is diluted with deionized water until the honeycomb ceramic carrier is just submerged, and then the coated honeycomb...

Embodiment 3

[0023] Weigh 0.98g Sm 2 o 3 Join HNO 3 , with 9.73g Ce(NO 3 ) 3 ·6H 2 O and 4.93g of citric acid are mixed and added with an appropriate amount of deionized water, and stirred evenly to obtain a coating solution. The size is 50mm×25mm×40mm, and the opening rate is 195cell / in 2 , with a mass of 31.23g cordierite honeycomb ceramics immersed in the coating solution, take it out, blow out the residual liquid in the honeycomb channel, air the cordierite honeycomb ceramics at room temperature to 50°C until the surface is dry, then dry at 120°C for 1 hour, and then Baked in a furnace at 500°C for 1 hour. Repeat the above process 2 to 3 times until the coating solution is completely impregnated and adsorbed, and finally baked in a muffle furnace at 500°C for 4 hours to produce Ce 0.8 SM 0.2 o 1.9 coating.

[0024] Measure 5.6mL H 2 PdCl 4 The aqueous solution is diluted with deionized water until the honeycomb ceramic carrier is just submerged, and then the coated honeycom...

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Abstract

A catalyst for catalytic combustion features that a coated composite oxide layer based on CeO2 is carried by cellular ceramic carrier. It contains the cellular cordierite ceramic matrix, coated composite oxide layer based on CeO2, and Pd. Its preparing process is also disclosed.

Description

technical field [0001] The present invention relates to a CeO 2 The invention relates to a Pd catalyst supported by a base composite oxide coating and a preparation method thereof, in particular to a catalyst for catalytic combustion and purification of organic waste gas and a preparation method thereof. Background technique [0002] Among the purification and treatment methods of organic waste gas, catalytic combustion technology, as a simple and practical organic waste gas purification technology, has received more and more attention. Catalytic combustion is an effective technology for purifying organic waste gas, and its core is a catalytic combustion catalyst. Therefore, the development of catalytic combustion catalysts with excellent performance has become the key to the development of this technology. [0003] Most of the existing catalytic combustion catalysts adopt a honeycomb structure, that is, cordierite honeycomb ceramics are used as a substrate, and a coating ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/64B01J37/02B01J35/04B01D53/94
Inventor 罗孟飞何迈谢云龙
Owner ZHEJIANG NORMAL UNIVERSITY
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