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Platinum-based oxidation catalyst for diesel vehicles and preparation method thereof

A technology for catalysts and diesel vehicles, applied in catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problems of aging catalyst performance degradation, high content of precious metals in coatings, poor low temperature performance, etc., to improve competition simple preparation method, good low temperature light-off activity effect

Active Publication Date: 2019-07-05
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are many problems in the low-temperature ignition, thermal durability, and cost of the existing diesel vehicle oxidation catalysts in the National IV emission stage.

Method used

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  • Platinum-based oxidation catalyst for diesel vehicles and preparation method thereof
  • Platinum-based oxidation catalyst for diesel vehicles and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment one: the preparation method of platinum-based oxidation catalyst for diesel vehicles comprises the following steps:

[0031] Contact layer slurry preparation and coating

[0032] (1) Preparation of contact layer slurry: Al 2 o 3 1. Zirconium acetate is added to deionized water at a weight ratio of 0.96:0.04, fully stirred evenly, and nitric acid is added to adjust the pH of the slurry to 4.45;

[0033] (2) Contact layer slurry ball milling: the slurry is ground by a planetary ball mill, the speed of the planetary ball mill is 250 rpm, the running time is 6h, and the particle size of the slurry is 15.3um to D90;

[0034] (3) Determination of the solid content in the contact layer slurry: Take 10 g of the slurry in a dry pot, place the dry pot in a muffle furnace at 550 ° C for 20 minutes, cool to room temperature, weigh the powder mass as 2.81 g, and use the The mass is divided by 10g, and the solid content of the slurry is 28.1%;

[0035] (4) Contact laye...

Embodiment 2

[0048] Embodiment two: the preparation method of diesel vehicle platinum-based oxidation catalyst, comprises the following steps:

[0049] Contact layer slurry preparation and coating

[0050] (1) Preparation of contact layer slurry: Al 2 o 3 1. Add zirconium acetate to deionized water, the weight ratio is 0.93:0.07, stir well, add nitric acid to adjust the pH of the slurry to 4.43;

[0051] (2) Contact layer slurry ball milling: the slurry is ground by a planetary ball mill, the speed of the planetary ball mill is 320 rpm, the running time is 4h, and the particle size of the slurry is 12.3um to D90;

[0052] (3) Determination of the solid content in the contact layer slurry: take 10 g of the slurry in a dry pot, place the dry pot in a muffle furnace at 580 ° C for 20 minutes, cool to room temperature, weigh the powder mass as 2.78 g, and use the The mass is divided by 10g, and the solid content of the slurry is 27.8%;

[0053] (4) Contact layer coating: Coating with a qua...

Embodiment 3

[0066] Embodiment three: the preparation method of diesel vehicle platinum-based oxidation catalyst, comprises the steps:

[0067] Contact layer slurry preparation and coating

[0068] (1) Preparation of contact layer slurry: Proportionally mix Al 2 o 3 1. Add zirconium acetate to deionized water, the weight ratio is 0.9:0.1, stir well, add nitric acid to adjust the pH of the slurry to 4.38;

[0069] (2) Contact layer slurry ball milling: the slurry is ground by a planetary ball mill, the rotation speed of the planetary ball mill is 380 rpm, the running time is 3h, and the particle size of the slurry reaches D90 of 11.4um;

[0070] (3) Determination of solid content in contact layer slurry: Take 10g of slurry in a dry pot, place the dry pot in a muffle furnace at 600°C for 10 minutes, cool to room temperature, weigh the powder mass as 2.69, use the mass Divided by 10g, the solid content of the slurry is 26.9%;

[0071] (4) Contact layer coating: Coating with a quantitative...

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Abstract

The invention relates to a diesel vehicle platinum-based oxidation catalyst and a preparation method thereof.The catalyst comprises a carrier coated with a contact layer.The contact layer is coated with an outer size layer and is an aluminum oxide size layer.The coating amount of the contact layer is 30-50 g / L, and the coating amount of the outer size layer is 90-100 g / L.The preparation method is simple, steps are easy to operate, the outer size layer is doped with aluminum oxide as the dispersing agent, ammonium tungstate serves as a thermal stabilizing auxiliary, a molecular screen is a low-temperature HC storage material, and HC adsorption at a low temperature can be improved; by adding zirconium adhesives, acid can have effects on fixing precious metal and preventing transfer of heavy metal; a manganous nitrate solution is added after heavy metal is fixed.By adding ammonium tungstate and manganous nitrate, a good combustion effect is achieved when the addition amount of heavy metal is small, HC and CO low-temperature combustion activity is good, durability is better, the production cost of the catalyst is reduced, and the competitiveness of the oxidation catalyst is improved.

Description

technical field [0001] The invention relates to a platinum-based oxidation catalyst for diesel vehicles and a preparation method thereof, belonging to the technical field of catalyst preparation. Background technique [0002] Motor vehicle exhaust pollution has become one of the main sources of air pollution. Most of NOX, CO, HC and PM in cities are produced by motor vehicle exhaust, especially diesel vehicles have the largest proportion of NOx and PM emissions. These pollutants not only cause damage to the human body, but also can produce photochemical smog under certain conditions, causing the death of vegetation and seriously destroying the living environment of human beings. At the beginning of this year, the National IV emission regulations for diesel vehicles have been officially implemented nationwide, and it is expected that the stricter National V regulations will be implemented in 2018. Therefore, higher requirements are put forward for the catalytic conversion e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/78B01J37/025
CPCB01J29/7815B01J37/0244B01J37/0246B01J2229/18
Inventor 杨金张元吕衍安郝士杰岳军李嘉铭季燕军王秀庭柯峰王刚邱祎源吴嘉昉袁芳芳潘丞烨陈正国贾莉伟
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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