Metallic composite oxides material with three hiberarchy and manufacture method thereof

A technology of metal composite and hierarchical structure, applied in the direction of metal/metal oxide/metal hydroxide catalyst, chemical instrument and method, catalyst activation/preparation, etc. gender issues

Active Publication Date: 2008-08-27
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, cerium-rich cerium-zirconium composite oxides have better oxygen storage capacity than zirconium-rich cerium-zirconium composite oxides, but the thermal stability of the former is worse than that of the latter. Therefore, the two patents disclosed above The disadvantage of this double-layer structure is that the cerium-zirconium oxygen storage material on the surface cannot take into account both oxygen storage capacity and thermal stability.

Method used

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  • Metallic composite oxides material with three hiberarchy and manufacture method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step one: 500g citric acid is dissolved in 500g deionized water to form 1000g citric acid solution, 214g ZrO(NO 3 ) 2 .5H 2 O, 434g Ce(NO 3 ) 3 .6H 2 O and 35.5g La(NO 3 ).6H 2 O was dissolved in 600 g deionized water to form a solution. Mix the two solutions and stir for 1 hour, add 1337g of alumina powder (particle diameter 90μm, specific surface area 150m 2 / g) to form a suspension. Then the suspension was heated at 80°C and stirred until evaporated to dryness, dried at 120°C for 12 hours, and then calcined at 600°C for 5 hours. The powder after roasting and cooling is ground to obtain a light yellow powder with a double-layer structure, that is, powder 1: the mass ratio of alumina to cerium-zirconium oxide is 5:1, and Ce / Zr in cerium-zirconium oxide is 3 / 2, La 2 o 3 Accounting for 5% of the total mass of cerium-zirconium oxide.

[0021] Step 2: 500g citric acid is dissolved in 500g deionized water to form 1000g citric acid solution, and 491g ZrO(NO 3 )...

Embodiment 2

[0023] Step one: 500g citric acid is dissolved in 500g deionized water to form 1000g citric acid solution, 491g ZrO(NO 3 ) 2 .5H 2 O, 166g Ce(NO 3 ) 3 .6H 2 O and 35.5g La(NO 3 ).6H 2 O was dissolved in 600 g deionized water to form a solution. Mix the two solutions and stir for 1 hour, add 1337g of alumina powder (particle diameter 45μm, specific surface area 150m 2 / g) to form a suspension. Then the suspension was heated at 80°C and stirred until evaporated to dryness, dried at 120°C for 12 hours, and then calcined at 600°C for 5 hours. The powder after roasting and cooling is ground to obtain a light yellow powder with a double-layered structure, that is, powder 2: the mass ratio of alumina to cerium-zirconium oxide is 5:1, and Ce / Zr in cerium-zirconium oxide is 1 / 4, La 2 o 3 Accounting for 5% of the total mass of cerium-zirconium oxide.

[0024] Step 2: 500g citric acid is dissolved in 500g deionized water to form 1000g citric acid solution, and 214g ZrO(NO 3 )...

Embodiment 3

[0026] Preparation of three-way catalyst A (Rh-powder 2 / Pd-powder 1 / ceramic carrier):

[0027] Pd coating: Mix powder 1 and deionized water evenly, and slowly add Pd(NO 3 ) 3 Solution, ball mill the suspension to a slurry I with an average particle diameter of 50 μm and a solid content of 45%. A certain amount of slurry I was coated on a honeycomb ceramic carrier with a specification of Φ20mm×40mm, 400cpsi / 6.5mil (volume 12.56ml), dried and roasted.

[0028] Rh coating: Mix powder 2 and deionized water evenly, and slowly add Rh(NO 3 ) 3 Solution, ball mill the suspension to a slurry II with an average particle diameter of 50 μm and a solid content of 40%. A certain amount of slurry II is coated on the Pd-coated carrier, dried and calcined. That is, the three-way catalyst A is prepared: Rh-powder 2 / Pd-powder 1 / ceramic carrier, and the specific composition is:

[0029] carrier

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Abstract

The invention discloses metal composite oxides material with three-layer structure for automobile tail gas clean-up catalyst coating and a preparation method thereof. The metal composite oxide material with three-layered structure is characterized in that the material has a three-layer structure including an alumina inner layer, and an intermediate layer and an outermost layer made from cerium-zirconium oxide and doped with ceria-removed rare earth oxide; when the atom ratio of Ce / Zr of cerium-zirconium oxide of the outermost layer is higher than or equal to 1, the atom ratio of Ce / Zr of cerium-zirconium oxide of the ntermediate layer is lower than or equal to 1 / 3; and when the atom ratio of Ce / Zr of cerium-zirconium oxide of the outermost layer is lower than or equal to 1 / 3, the atom ratio of Ce / Zr of cerium-zirconium oxide of the ntermediate layer is higher than or equal to 1. The material has good high temperature stability and high pollutant treatment capacity.

Description

technical field [0001] The invention discloses a metal composite oxide material with a three-layer structure used for automobile tail gas purification catalyst coating, and also discloses a preparation method of the metal composite oxide material. Background technique [0002] The main pollutants of automobile exhaust are carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx). The catalyst installed in the exhaust system can oxidize CO and HC into carbon dioxide (CO 2 ), water (H 2 O), and at the same time reduce NOx to nitrogen (N 2 ), to achieve the purification of exhaust gas, this kind of catalyst is usually called three-way catalyst. The three-way catalyst consists of two parts: a honeycomb ceramic or metal support, and a catalyst coating attached to the support. The catalyst coating is usually composed of an oxide material (such as alumina) with a large specific surface area, an oxygen storage material, and a noble metal active component (usually one of P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63B01J37/025B01D53/94
CPCB01J35/109B01D2255/407B01J35/04B01J35/1019B01J35/0006B01D2255/2092B01J37/0244B01D53/9445B01J23/63Y02T10/22B01D2255/9025B01J23/38B01J23/894Y02T10/12Y02A50/20
Inventor 岳军褚霞
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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