Single-coat three-way catalyst and preparation method thereof

A three-way catalyst, single-coating technology, applied in chemical instruments and methods, heterogeneous catalyst chemical elements, physical/chemical process catalysts, etc., can solve the problems of high price, uneven distribution of precious metal particles, easy sintering, etc. Achieve the effect of improving the dispersion of precious metals, large market application value, and reducing preparation costs

Inactive Publication Date: 2019-09-06
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional catalysts usually meet the increasingly stringent emission regulations by increasing the amount of precious metals, but precious metal resources are scarce, expensive, and non-renewable, so improving the utilization of precious metals is particularly important and has become a current research hotspot
[0004] The traditional catalyst uses noble metal solution to directly diffuse and impregnate the coating material, the distribution of noble metal particles is not uniform, and the agglomeration of noble metal is prone to occur. The utilization rate of noble metal in this state is low, and it is easy to sinter at high temperature

Method used

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  • Single-coat three-way catalyst and preparation method thereof
  • Single-coat three-way catalyst and preparation method thereof
  • Single-coat three-way catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of preparation method of single coating three-way catalyst comprises the steps:

[0032] 1. Preparation of Rh / CeZrLaOx powder:

[0033] (1), the cerium nitrate hexahydrate crystal that takes 40 weight parts is dissolved in the deionized water of 150 weight part, stirs 5 minutes to all crystals dissolve;

[0034] (2), take by weighing the zirconium acetate solution that contains 200 parts by weight, join in the solution that step (1) makes, stir until all crystals dissolve;

[0035] (3), take by weighing the lanthanum nitrate hexahydrate crystal of 5 weight parts, join in the solution that step (2) makes, stir until all crystals dissolve;

[0036] (4), weigh 1.70 parts by weight of rhodium nitrate solution with a concentration of 15wt.%, add it dropwise to the solution made in step (3), keep stirring for 30 minutes, then add ammonia water dropwise until the slurry becomes colloidal, and continue stirring for 5 hours ;

[0037] (5), the colloid prepared in step ...

Embodiment 2

[0046] A kind of preparation method of single coating three-way catalyst comprises the steps:

[0047] 1. Rh / CeZrLaO x Preparation of powder:

[0048] (1), the cerium nitrate hexahydrate crystal that takes 60 weight parts is dissolved in the deionized water of 160 weight part, stirs 5 minutes until all crystals dissolve;

[0049](2), take by weighing the zirconium acetate solution that contains 180 parts by weight, join in the solution that step (1) makes, stir until all crystals dissolve;

[0050] (3), take by weighing the lanthanum nitrate hexahydrate crystal of 9 weight parts, join in the solution that step (2) makes, stir until all crystals dissolve;

[0051] (4), weigh 1.37 parts by weight of rhodium nitrate solution with a concentration of 15wt.%, add it dropwise to the solution made in step (3), keep stirring for 30 minutes, then add ammonia water dropwise until the slurry becomes colloidal, and continue stirring for 3 hours ;

[0052] (5), the colloid prepared in s...

Embodiment 3

[0061] A kind of preparation method of single coating three-way catalyst comprises the steps:

[0062] 1. Rh / CeZrLaO x Preparation of powder:

[0063] (1), take 80 weight parts of cerium nitrate hexahydrate crystals and dissolve them in 170 weight parts of deionized water, stir for 5 minutes until all crystals dissolve;

[0064] (2), take by weighing the zirconium acetate solution that contains 160 parts by weight, join in the solution that step (1) makes, stir until all crystals dissolve;

[0065] (3), take by weighing the lanthanum nitrate hexahydrate crystal of 14 weight parts, join in the solution that step (2) makes, stir until all crystals dissolve;

[0066] (4), weigh 1.17 parts by weight of rhodium nitrate solution with a concentration of 15wt.%, add it dropwise to the solution made in step (3), keep stirring for 30 minutes, then add ammonia water dropwise until the slurry becomes a colloid, and continue stirring for 4 hours ;

[0067] (5), the colloid prepared in ...

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Abstract

The invention relates to a single-coat three-way catalyst and a preparation method thereof. The catalyst comprises a catalyst carrier and a coating material, and the catalyst carrier is uniformly coated with the coating material; and the coating material comprises CeZrLaOx composite oxide, alumina, noble metal Pd and noble metal Rh. The preparation method comprises the following steps: preparationof Rh/CeZrLaOx powder, preparation of Pd/Al2O3 powder, preparation of a slurry from the Rh/CeZrLaOx powder and Pd/Al2O3 powder, ball milling, coating, drying and calcination. The method adopts a sol-gel technology to prepare the three-way catalyst with uniform particle size distribution, so the dispersion degree of the noble metals is effectively increased, the activity of the three-way catalystis improved, and the formation of palladium-ruthenium alloy is avoided; and a single-coating application technology of the same layer of Pd-Rh is adopted, so the preparation cost of the three-way catalyst is reduced, and the catalyst has great market application values.

Description

technical field [0001] The invention relates to a single-coated three-effect catalyst and a preparation method thereof, belonging to the technical field of catalyst preparation. Background technique [0002] Gasoline vehicle exhaust is one of the main sources of environmental pollution, including carbon monoxide (CO), unburned hydrocarbons (HC) and nitrogen oxides (NOx). Unburned hydrocarbons are adsorbed on the surface of smog particles. If it enters the human body, it will cause serious damage to human health, and nitrogen oxides form acid rain, which directly endangers the ecological environment. [0003] At present, the post-treatment of gasoline vehicle exhaust pollutants is the most effective way to control pollutant emissions. Three-way catalysts (TWC) are used to catalytically convert the pollutants (HC, CO and NOx) emitted by vehicles to generate carbon dioxide, nitrogen and water. to the atmosphere. my country's motor vehicle pollutant emission regulations are be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/63F01N3/10F01N3/28
CPCB01J23/002B01J23/63B01J2523/00F01N3/101F01N3/2825B01J2523/31B01J2523/3706B01J2523/3712B01J2523/48Y02T10/12
Inventor 蔡晓江郝士杰贾莉伟李新华岳军胡怡帆吕衍安李爱国李卫卫张艮交王燕徐岘王家明
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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