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Gasoline vehicle three-way catalyst and preparation method thereof

A three-way catalyst, gasoline vehicle technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as reduction, achieve inhibition of deep diffusion, improve catalytic activity and high temperature durability Ensuring the effect of catalytic activity

Inactive Publication Date: 2020-06-26
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For example, Chinese patent document CN108940280A discloses a three-way catalyst for gasoline vehicles, which uses cordierite honeycomb ceramics as a catalyst carrier, and the surface of the catalyst carrier is coated with a coating solution containing noble metals Pd and Rh on both sides, including The bottom coating and the outer coating, the catalyst has a certain effect on the light-off temperature of HC, CO and NOX, especially the temperature required for 50% conversion has been reduced to a certain extent, but in actual use , the temperature required for the catalyst to reach 90% conversion rate is relatively high. In this regard, how to reduce the temperature required for gasoline vehicle three-way catalyst to achieve 90% conversion rate of automobile exhaust still needs further research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Primer coating preparation and application:

[0023] (1) Weighing materials: weigh La-Al with 4% La content according to the weight ratio of 0.44:0.44:0.05:0.03:0.04 2 o 3 , Ce-Zr solid solution with 45% Ce content, Ba(AC) 2 , La(NO 3 ) 3 ·6H 2 O, cured product content is the aluminum glue of 10wt%; (2) Pd (NO 3 ) 2 Weighing of the solution: the weight of the Pd compound solution=the loading amount of Pd / 28.316 / the coating amount of the primer layer / the concentration of the Pd compound solution*the weight of the primer layer; wherein, the loading amount of Pd is 36g / ft 3 , the coating amount of bottom coating is 120g / L, and the weight of bottom coating replaces with the material gross weight that weighs in step (1), with the material 200g in the step (1), the weight that obtains Pd compound solution is 15.08g; (3) get the Pd(NO 3 ) 2 2 / 3 of the weight of the solution is 10.05g, La(NO 3 ) 3 ·6H 2 O added to the above Pd(NO 3 ) 2 solution, and add ethanol so...

Embodiment 2

[0027] Primer coating preparation and application:

[0028] (1) Weighing materials: weigh La-Al with 2% La content according to the weight ratio of 0.6:0.75:0.01:0.01:0.05 2 o 3 , Ce-Zr solid solution of 25% Ce content, barium nitrate, lanthanum acetate, the zirconium colloid that cured product content is 4wt%; (2) Pd(NO 3 ) 2 Weighing of the solution: the weight of the Pd compound solution = the loading amount of Pd / 28.316 / the coating amount of the primer layer / the concentration of the Pd compound solution*the weight of the primer layer; wherein, the loading amount of Pd is 100g / ft 3 , the coating amount of bottom coating is 150g / L, and the weight of bottom coating replaces with the material gross weight that weighs in the step (1), with the material 200g in the step (1), the weight that obtains Pd compound solution is 33.50g; (3) 1 / 2 of the weight of the palladium chloride solution in the step (2) is 16.75g, lanthanum acetate is added in the above-mentioned palladium chlo...

Embodiment 3

[0032] Primer coating preparation and application:

[0033] (1) Weighing materials: weigh La-Al with 1% La content according to the weight ratio of 0.17:0.3:0.1:0.05:0.01 2 o 3 , Ce-Zr solid solution with 60% Ce content, Sr(NO 3 ) 3 ·6H 2 O, La(NO 3 ) 3 ·6H 2 O, cured product content is the titanium glue of 6wt%; (2) Pd (NH 3 ) 2 (NO 2 ) 2 Weighing of the solution: weight of Pd compound solution = loading amount of Pd / 28.316 / coating amount of primer layer / concentration of Pd compound solution*weight of primer layer; wherein, the load amount of Pd is 150g / ft 3 , the coating weight of bottom coating is 100g / L, and the weight of bottom coating replaces with the material gross weight that weighs in step (1), with the material 200g in step (1), the weight that obtains Pd compound solution is 75.41g; (3) get the Pd(NH in step (2) 3 ) 2 (NO 2 ) 2 2 / 3 of the weight of the solution is 50.27g, La(NO 3 ) 3 ·6H 2 O added to the above Pd(NH 3 ) 2 (NO 2 ) 2 solution, a...

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PUM

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Abstract

The invention discloses a preparation method of a gasoline vehicle three-way catalyst. A bottom layer coating and an outer layer coating are formed on the surface of a catalyst carrier, the bottom layer coating comprises a Pd active component, and the outer layer coating comprises Rh and Pd active components. The invention also discloses the gasoline vehicle three-way catalyst prepared by the preparation method, and the gasoline vehicle three-way catalyst can effectively reduce the temperature required to be reached by 90% of conversion rate of automobile exhaust.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a three-way catalyst for gasoline vehicles and a preparation method thereof. Background technique [0002] Vehicle exhaust pollution has become one of the main sources of air pollution. Most nitrogen oxides (NO X ), CO and hydrocarbons (HC) are all produced by vehicle exhaust. NO X , CO, HC, and PM not only cause damage to the human body but also destroy the living environment of human beings under certain conditions. [0003] Gasoline vehicle three-way catalyst (TWC) is used to oxidize CO, HC and NO in gasoline vehicle exhaust X The reduction of the coating is mainly composed of alumina, Ce-Zr solid solution, additives and active precious metal components. The precious metal is the key component of the three-way catalyst for gasoline vehicles. For gasoline vehicle TWC catalyst, it is to use TWC catalyst to reduce HC, CO and NO in gasoline engine exhaust X The activation ...

Claims

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Application Information

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IPC IPC(8): B01J23/63B01J37/025B01J37/08B01D53/86B01D53/62B01D53/72B01D53/56
CPCB01D53/56B01D53/62B01D53/72B01D53/865B01D2258/012B01J23/63B01J37/0009B01J37/0236B01J37/0244B01J37/08
Inventor 杨金蒋颉严强岳军贾莉伟孙亮王家明
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST