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Preparation method of three-way catalyst with high CO purification capability and catalyst of preparation method

A three-way catalyst and purification technology technology, applied in catalyst activation/preparation, physical/chemical process catalyst, catalyst carrier, etc., can solve the problems of high engine CO emission, insufficient catalyst conversion rate and efficiency of CO, etc., to improve the purification of CO ability, excellent CO emission reduction effect, and the effect of increasing the ability to oxidize CO

Active Publication Date: 2019-06-14
SINOCAT ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the above typical models, the engine CO emissions are often high in the acceleration section or high-speed section, resulting in insufficient catalyst conversion rate and efficiency.

Method used

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  • Preparation method of three-way catalyst with high CO purification capability and catalyst of preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The size of the TWC carrier used in preparing the catalyst in this example is Φ118.4*50, the mesh number and wall thickness are 750cpsi and 2mil respectively, and the volume is 0.55L. The catalyst preparation process is as follows:

[0037] (1) The improved precipitation method was used to prepare the cerium-zirconium-aluminum-based composite catalytic material. The main process was as follows: first step, the pseudo-boehmite precursor was taken, dried at 120°C for 3h, and treated at 300°C for 3h to obtain Preprocess the material. In the second step, the obtained pretreated material is placed in a container and stirred. Take another cerium-zirconium colloidal solution, containing 32wt% of the total mass fraction of cerium-zirconium-lanthanum oxide, and the contained CeO 2 , ZrO 2 and La 2 o 3 The mass ratio is 8:1:1, add it into the pretreatment material under stirring, and continue stirring for 0.5h. Aqueous ammonia solution (25 wt%) was added thereto so that pH=...

Embodiment 2

[0041] The size of the TWC carrier used in preparing the catalyst in this example is Φ118.4*50, the mesh number and wall thickness are 750cpsi and 2mil respectively, and the volume is 0.55L. The catalyst preparation process is as follows:

[0042] (1) adopt the method for embodiment 1 to prepare cerium-zirconium-aluminum matrix composite catalytic material (CeO 2 16wt%-ZrO 2 2wt%-La 2 o 3 2wt%-Al 2 o 3 80wt%);

[0043] (2) The cerium-zirconium-aluminum-based composite catalytic material, the first cerium-zirconium-based catalytic material (CeO 2 40wt% - ZrO 2 50wt%-Y 2 o 3 5wt%-La 2 o 3 5wt%) and the first alumina-based catalytic material (containing Al 2 o 3 96wt%-La 2 o 3 4wt%) according to mass ratio 1:4:3, then add aluminum sol (accounting for 2% of slurry content) and deionized water, ball mill and stir for 30min; add palladium nitrate solution (containing Pd 80g / ft 3 ), ball milling and stirring for 30min, the first coating slurry is prepared, and ...

Embodiment 3

[0046] The size of the TWC carrier used in preparing the catalyst in this example is Φ118.4*50, the mesh number and wall thickness are 750cpsi and 2mil respectively, and the volume is 0.55L. The catalyst preparation process is as follows:

[0047] (1) adopt the method for embodiment 1 to prepare cerium-zirconium-aluminum matrix composite catalytic material (CeO 2 16wt%-ZrO 2 2wt%-La 2 o 3 2wt%-Al 2 o 3 80wt%);

[0048] (2) The cerium-zirconium-aluminum-based composite catalytic material, the first cerium-zirconium-based catalytic material (CeO 2 40wt% - ZrO 2 50wt%-Y 2 o 3 5wt%-La 2 o 3 5wt%) and the first alumina-based catalytic material (containing Al 2 o 3 96wt%-La 2 o 3 4wt%) by mass ratio 5:4:1, then add aluminum sol (accounting for 2% of slurry content) and deionized water, ball mill and stir for 30min; add palladium nitrate solution (containing Pd 100g / ft 3 ), ball milling and stirring for 30min, the first coating slurry is prepared, and the parti...

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Abstract

The invention discloses a preparation method of a three-way catalyst with a high CO purification capability and the catalyst of the preparation method. The preparation method comprises the following steps: Preparing a cerium zirconium aluminum based composite catalytic material by adopting an improved precipitation method, preparing a first coating and preparing a second coating, wherein the firstcoating is prepared from a cerium zirconium aluminum based material, a cerium zirconium based material, aluminum oxide and metallic palladium and the second coating is prepared from the cerium zirconium aluminum based material, the cerium zirconium based material, an aluminum oxide material, rhodium nitrate and palladium nitrate. According to the preparation method, a cerium zirconium aluminum based component is introduced into the aluminum oxide material to obtain the cerium zirconium aluminum based composite catalytic material; the cerium zirconium aluminum based composite catalytic material is matched with traditional cerium zirconium based material and aluminum oxide material, so that the capability of purifying CO through a traditional three-way catalyst can be improved; meanwhile, HC and NOx purification capabilities can be kept very well and an excellent CO emission reduction effect is realized in WLTC emission of a whole vehicle.

Description

technical field [0001] The invention relates to a three-way catalyst with high CO purification capacity and belongs to the technical field of automobile catalyst preparation. Background technique [0002] Gasoline engine exhaust emissions have become one of the main sources of urban pollution in China. The gaseous pollutants emitted by gasoline engine exhaust mainly contain carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOx). In order to effectively control the emission of gas pollutants from gasoline engines, a three-way catalyst (TWC) is generally used. The active components of TWC are mainly Pd and Rh, and the precious metal carrier materials are mainly cerium-zirconium-based catalytic materials (that is, catalytic materials containing ceria and zirconia) and alumina-based catalytic materials (that is, catalytic materials that contain alumina). Among them, Pd mainly oxidizes CO and HC, and Rh mainly reduces NOx. As people's requirements for the environment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J23/63B01J32/00B01J37/03B01J37/08B01J37/02B01D53/94B01D53/62B01D53/86
CPCY02A50/20
Inventor 陈山虎李大成兰丽王金凤黄超谋叶辉杨兰刘屿剑张锋杨怡程永香董银华颜意王云李云陈启章
Owner SINOCAT ENVIRONMENTAL TECH
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