A kind of preparation method of catalyst for automobile exhaust gas and its product and application

A technology for automobile exhaust and catalysts, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as threats to health, poor anti-poisoning ability, and reduced catalytic activity, and achieve excellent processing capacity. , improve sulfur resistance, improve the effect of catalytic activity

Active Publication Date: 2021-05-07
江苏智加能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the discharge of these toxic and harmful gases not only pollutes the environment, induces photochemical smog, causes secondary pollution, and even causes acid rain, greenhouse effect and ozone hole effect, even threatens human health, and even causes life danger. Therefore, how to reduce the pollution of the above substances Emissions are an important issue that needs to be solved urgently
[0003] Utilize catalytic technology to accelerate the redox reaction of CO, HC and NOx in automobile exhaust gas, and convert most pollutants into harmless CO 2 、H 2 O and N 2 , in order to achieve the purpose of purifying automobile exhaust, due to the increasingly stringent emission standards, relying only on the current catalyst in the machine and unable to meet the needs of the current stage, how to provide an excellent catalyst that can efficiently remove the above substances is still a huge challenge
[0004] Platinum group metals (Pt, Rh, Pd) are the main active components of catalysts for automobile exhaust. Among the three noble metals, Pd catalysts have good activity for the oxidation of HC, and their high temperature resistance is also stronger, which is better than that of Pt and Rh. , but poor anti-poisoning ability, especially for SO 2 Sensitive to lead Pb poisoning
The noble metal rhodium Rh has a high reduction activity to nitrogen oxides NOx, but it is easy to form an alloy with Pd at high temperature, which greatly reduces its catalytic activity.

Method used

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  • A kind of preparation method of catalyst for automobile exhaust gas and its product and application
  • A kind of preparation method of catalyst for automobile exhaust gas and its product and application

Examples

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Effect test

Embodiment 1

[0032] A kind of preparation method of the catalyst that automobile exhaust is used, described preparation method comprises the following steps:

[0033] (1) Immerse alumina particles with a diameter of 1 mm in 45 mL of a mixed aqueous solution containing magnesium nitrate and urea, heat-treat at 80° C. for 24 hours, filter, wash, then dry, and roast to obtain magnesium-modified alumina; The molar ratio of aluminum to magnesium nitrate is 18:1; the molar ratio of urea to magnesium nitrate is 9:1; the drying is at 120°C for 9 hours; the roasting is at 500°C for 6 hours;

[0034] (2) Take a certain amount of cerium nitrate, zirconium nitrate, yttrium nitrate and samarium nitrate by stoichiometric ratio to form a mixed solution, and use the mixed solution of ammonia and ammonium carbonate as a precipitant for precipitation, wherein the mol ratio of ammonia and ammonium carbonate 1:1, add the precipitant dropwise to the above solution, stir and keep the pH at 10, age for 22h, filt...

Embodiment 2

[0041] A kind of preparation method of the catalyst that automobile exhaust is used, described preparation method comprises the following steps:

[0042] (1) Immerse alumina particles with a diameter of 1 mm in 50 mL of a mixed aqueous solution containing magnesium nitrate and urea, heat-treat at 85° C. for 20 hours, filter, wash, then dry, and roast to obtain magnesium-modified alumina; The molar ratio of aluminum to magnesium nitrate is 20:1; the molar ratio of urea to magnesium nitrate is 8:1; the drying is at 140°C for 8 hours; the roasting is at 550°C for 4 hours;

[0043] (2) Take a certain amount of cerium nitrate, zirconium nitrate, yttrium nitrate and samarium nitrate by stoichiometric ratio to form a mixed solution, and use the mixed solution of ammonia and ammonium carbonate as a precipitant for precipitation, wherein the mol ratio of ammonia and ammonium carbonate 1:1, add the precipitant dropwise to the above solution, stir and keep the pH at 9, age for 24h, filte...

Embodiment 3

[0050] A kind of preparation method of the catalyst that automobile exhaust is used, described preparation method comprises the following steps:

[0051] (1) Immerse alumina particles with a diameter of 1mm in 40mL of a mixed aqueous solution containing magnesium nitrate and urea, heat-treat at 70°C for 26 hours, filter, wash, then dry, and roast to obtain magnesium-modified alumina; The molar ratio of aluminum to magnesium nitrate is 15:1; the molar ratio of urea to magnesium nitrate is 10:1; the drying is at 110°C for 10 hours; the roasting is at 440°C for 8 hours;

[0052] (2) Take a certain amount of cerium nitrate, zirconium nitrate, yttrium nitrate and samarium nitrate by stoichiometric ratio to form a mixed solution, and use the mixed solution of ammonia and ammonium carbonate as a precipitant for precipitation, wherein the mol ratio of ammonia and ammonium carbonate 1:1, add the precipitating agent dropwise to the above solution, stir and keep the pH at 10, age for 20h...

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Abstract

The invention discloses a preparation method of a catalyst for automobile tail gas as well as its product and application. By first loading a coating containing magnesium-modified alumina, samarium oxide and yttrium oxide-modified cerium-zirconium solid solution and aluminum sol on the cordierite honeycomb ceramic substrate, then loading the noble metal palladium, and then loading the coating containing magnesium-modified alumina , samarium oxide and yttrium oxide modified cerium zirconium solid solution and aluminum sol coating, and then load rhodium, coating by the above method can effectively avoid the alloying of palladium and rhodium, and magnesium modified alumina can effectively reduce the precious metal At the same time, the presence of magnesium can significantly improve the activity and sulfur resistance, and the oxygen storage and release performance and thermal stability of the catalyst can be improved by using samarium oxide and yttrium oxide to modify the cerium-zirconium solid solution, so the catalyst is used for Ideal material for automobile exhaust treatment.

Description

technical field [0001] The invention relates to the field of automobile tail gas treatment, in particular to a method for preparing a catalyst for automobile tail gas and its product and application. Background technique [0002] As we all know, the main pollutants of automobile exhaust are carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NO x ) three components. Moreover, the discharge of these toxic and harmful gases not only pollutes the environment, induces photochemical smog, causes secondary pollution, and even causes acid rain, greenhouse effect and ozone hole effect, even threatens human health, and even causes life danger. Therefore, how to reduce the pollution of the above substances Emissions are an important issue that needs to be solved urgently. [0003] Utilize catalytic technology to accelerate the redox reaction of CO, HC and NOx in automobile exhaust gas, and convert most pollutants into harmless CO 2 、H 2 O and N 2 , in order to achieve th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/63B01J37/02B01D53/94B01D53/72B01D53/62B01D53/56
CPCB01D53/945B01D2258/01B01J23/002B01J23/63B01J37/0244B01J2523/00B01J2523/22B01J2523/31B01J2523/36B01J2523/3712B01J2523/3737B01J2523/48B01J2523/822B01J2523/824Y02T10/12Y02A50/20
Inventor 何志坚
Owner 江苏智加能源科技有限公司
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