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Preparation process of vehicle three-way catalyst coating layer

A technology of three-way catalyst and preparation process is applied in the field of preparation of rare earth-based composite materials to achieve the effect of reducing production cost and improving dispersibility

Active Publication Date: 2012-07-11
宁波科森净化器制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the production of rare earth materials, there are technical problems of how to improve their specific surface area, thermal aging resistance, and reduce their particle size, thereby improving their performance.

Method used

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  • Preparation process of vehicle three-way catalyst coating layer
  • Preparation process of vehicle three-way catalyst coating layer

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Experimental program
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Embodiment Construction

[0023] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] figure 1 Shown is a schematic process flow diagram of an embodiment of the present invention.

[0025] Such as figure 1 As shown, the preparation process of the automobile three-way catalyst coating material of the present invention comprises alumina dispersion process, co-precipitation raw material feeding process, precipitation process, aging process, roasting and pulverization process;

[0026] The alumina dispersion process is to dissolve the dispersant in deionized water, and put in alumina after the dissolution is complete;

[0027] Co-precipitation raw material feeding process is to put cerium nitrate and zirconium acetate into the above slurry, fully adsorb on the dispersed alumina particles, and mix evenly;

[0028] The precipitation process is to inject the precipitant ammonia water or sodium hydroxide into the above slurry ...

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Abstract

The invention discloses a preparation process of a coating layer for vehicle three-way catalyst, comprising processes of dispersing alumina, feeding co-sediment material, depositing, aging, sintering and crushing; the process of dispersing alumina comprises uniformly stirring and dispersing alumina powder in deionised water through a dispersing agent; the process of feeding co-sediment material comprises adding cerous nitrate and zirconium nitrate into the sizing agent; the process of depositing comprises pouring a depositing agent into the sizing agent and generating Ce(OH)4 and Zr (OH)4 on the surface of alumina until the pH value reaches to be between 8.0 and 10.0; the process of aging comprises stirring and aging for a certain period of time when the pH value reaches to a target value; the process of sintering and crushing comprises drying, sintering and crushing the aged sizing agent at a certain temperature so as to obtain rare earth coating material for vehicle three-way catalyst.

Description

technical field [0001] The invention relates to a preparation process of a rare earth-based composite material, in particular to a preparation process of a coating material for an automobile three-way catalyst produced by adopting alumina as a base material and co-precipitating cerium nitrate and zirconium acetate. Background technique [0002] Invention patent name: a gasoline vehicle exhaust catalyst and its preparation method, patent application number: 200510040958, which discloses a gasoline vehicle exhaust catalyst and its preparation method, the active components of precious metals are dispersed in nitrate, organic acid or both The mixture of substances can greatly improve the dispersion of noble metal active components on the carrier, improve the stability of the catalyst, and prolong the life of the catalyst. The technical scheme is a honeycomb catalyst composed of carrier, coating and active components, with square or triangular parallel channels inside, and the ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J35/10B01D53/94
CPCY02T10/22Y02A50/20Y02T10/12
Inventor 张保才王新昕钱旺木
Owner 宁波科森净化器制造有限公司
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