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Method for preparing automobile exhaust gas purification catalyst

A technology for purifying catalysts and automobile exhaust, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of poor high temperature stability, small specific surface area, and PTO catalytic performance Poor and other issues

Inactive Publication Date: 2015-06-10
LIUZHOU HAOXIANGTE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The catalytic performance of PTO with a single component is not good;
[0004] 2. γ-Al 2 o 3 Poor high temperature stability, phase transition will occur above 900 °C;
[0005] 3. Small specific surface area

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Al (NO 3 ) 3 Dissolve in water, stir at a temperature of 70°C, then add ammonia water drop by drop, and add La(NO 3 ) 3 , the solution guarantees Al 3+ : NH 3 =1:3, Al (NO 3 ) 3 The concentration is 0.6g / ml, pH=8, La(NO 3 ) 3 The amount of added accounted for 2% of the total mass of the solution, and continued to stir for more than 2 hours; then stood for aging for 10 hours, and then added γ-Al 2 o 3 Made of aluminum glue; at the same time, according to La 0.8 Ce 0.2 co 0.9 mn 0.05 Cu 0.05 o 3 Weigh the nitrate in the metal element molar ratio, stir and dissolve it in deionized water at room temperature, add citric acid and stir in an amount of 1.5:1 with the metal ion molar ratio, then add dropwise ethylene glycol equivalent to citric acid, Stir for 5h, process into a gel at 70°C, then dry at 120°C, and then carry out self-propagating reaction on an electric furnace to obtain La 0.8 Ce 0.2 co 0.9 mn 0.05 Cu 0.05 o 3sol; then put cordierite into γ-A...

Embodiment 2

[0032] Al (NO 3 ) 3 Dissolve in water, stir at a temperature of 80°C, then add ammonia water drop by drop, and add La(NO 3 ) 3 , the solution guarantees Al 3+ : NH 3 =1:3, Al (NO 3 ) 3 The concentration is 0.7g / ml, pH=9, La(NO 3 ) 3 The amount of added accounted for 3% of the total mass of the solution, and continued to stir for more than 2 hours; then stood for aging for 12 hours, and then added γ-Al 2 o 3 Made of aluminum glue; at the same time, according to La 0.8 Ce 0.2 co 0.8 mn 0.1 Cu 0.1 o 3 Weigh the nitrate in the metal element molar ratio, stir and dissolve it in deionized water at room temperature, add citric acid and stir in an amount of 1.5:1 with the metal ion molar ratio, then add dropwise ethylene glycol equivalent to citric acid, Stir for 5h, process into a gel at 70°C, then dry at 120°C, and then carry out self-propagating reaction on an electric furnace to obtain La 0.8 Ce 0.2 co 0.8 mn 0.1 Cu 0.1 o 3 sol; then put cordierite into γ-Al ...

Embodiment 3

[0034] Al (NO 3 ) 3 Dissolve in water, stir at a temperature of 90°C, then add ammonia water drop by drop, while adding La(NO 3 ) 3 , the solution guarantees Al 3+ : NH 3 =1:3, Al (NO 3 ) 3 The concentration is 0.8g / ml, pH=9, La(NO 3 ) 3 The amount of added accounted for 4% of the total mass of the solution, and continued to stir for more than 2 hours; then stood for aging for 14 hours, and then added γ-Al 2 o 3 Made of aluminum glue; at the same time, according to La 0.8 Ce 0.2 co 0.6 mn 0.2 Cu 0.2 o 3 Weigh the nitrate in the metal element molar ratio, stir and dissolve it in deionized water at room temperature, add citric acid and stir in an amount of 1.5:1 with the metal ion molar ratio, then add dropwise ethylene glycol equivalent to citric acid, Stir for 5h, process into a gel at 70°C, then dry at 120°C, and then carry out self-propagating reaction on an electric furnace to obtain La 0.8 Ce 0.2 co 0.6 mn 0.2 Cu 0.2 o 3 sol; then put cordierite into γ...

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Abstract

The invention relates to the field of automobile exhaust gas purification catalysts and particularly relates to a method for preparing an automobile exhaust gas purification catalyst. The method comprises the steps: preparing gamma-Al2O3 gel; synthesizing La0.8Ce0.2Co(1-2x)MnxCuxO3 sol by taking water as a solvent; dipping cordierite in alumina gel; taking out the dipped cordierite, and blowing the alumina gel away from hole passages, so as to obtain gamma-Al2O3 loaded cordierite; dipping the gamma-Al2O3 loaded cordierite in the La0.8Ce0.2Co(1-2x)MnxCuxO3 sol, and blowing the gel away from hole passages; standing, drying and roasting. According to the method disclosed by the invention, a gamma-Al2O3 activated coating layer carrier can be prepared through the steps; La(NO3)3 is added while dropwise adding ammonia water, so that ion surface diffusion and structural rearrangement, which cause the phase transformation and sintering of gamma-Al2O3, are prevented, the loss of a specific surface area is effectively reduced, and gamma-Al2O3 can be better loaded to the cordierite through dipping; meanwhile, a B site of LaCoO3 is doped with two kinds of elements, namely Mn and Gu, by using a sol-gel method, so that a B-site-dual-doped perovskite type catalyst is prepared, and the activity of the catalyst is greatly improved.

Description

technical field [0001] The invention relates to the field of automobile tail gas purification catalysts, in particular to a preparation method of the automobile tail gas purification catalyst. Background technique [0002] With the increase of car ownership, the CO, HC and NO emitted by cars into the atmosphere X more and more. At present, many countries have adopted strict emission control measures on vehicle exhaust emissions. Therefore, the treatment of automobile exhaust has become an important issue day by day. In the prior art, the control of automobile exhaust emission is realized by adding a catalytic converter, and the key of the catalytic converter is the catalyst. Catalysts usually adopt a three-layer structure consisting of active components, washcoat and carrier. Since the rare earth perovskite oxide (PTO) was used in exhaust gas catalysis, because its A and B sites can be replaced to generate oxygen vacancies, and at the same time, this type of catalyst has...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/10
Inventor 易鉴荣林荔琍唐臻吴坚
Owner LIUZHOU HAOXIANGTE SCI & TECH