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Catalyst for purifying automobile exhaust and process for producing carrier using said catalyst

A technology for purifying catalysts and automobile exhaust, which is applied in chemical instruments and methods, separation methods, and dispersed particle separation, etc., can solve the problems of large amount of precious metals, unstable performance and high light-off temperature, and achieves good practical performance and light-off. The effect of low temperature and high processing efficiency

Inactive Publication Date: 2004-07-14
张剑仲 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of existing automobile exhaust purification catalysts is not stable enough, and the light-off temperature is relatively high. Due to the large amount of precious metals used, the cost is also relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The automobile tail gas purification catalyst of the present invention is made through the following processing steps:

[0025] (1), put into the container of beating equipment and be respectively the concentrated nitric acid of 4000 parts by weight and the concentrated nitric acid of 14, concentrated nitric acid also can be 11 or 16 or 23, then the parts by weight are respectively: aluminum oxide 1000, calcium carbonate 60 , magnesium nitrate 80, cerium oxide 260, zirconium oxide 80, lanthanum nitrate 100, nickel oxide 20, tin oxide 20, and potassium nitrate 15 were put into the container of the beating equipment, and the above mixture was stirred evenly to obtain a slurry mixture, wherein alumina , cerium oxide, zirconium oxide, nickel oxide, and tin oxide have a particle size of less than 5 microns;

[0026] (2) After drying the honeycomb ceramics in the car purifier in an oven, place the honeycomb ceramics in the vacuum coating equipment, and then place the slurry m...

Embodiment 2

[0034] (1), put into the concentrated nitric acid of 3000 water and 8 parts by weight respectively in the container of beating equipment, then the parts by weight are respectively: aluminum oxide 600, calcium carbonate 40, magnesium nitrate 30, cerium oxide 200, zirconium oxide 50. Put lanthanum nitrate 100 into the container of the beating equipment, stir the above mixture evenly to obtain a slurry mixture, wherein the particle size of alumina, cerium oxide and zirconia is below 5 microns;

[0035] (2) After drying the honeycomb ceramics in the car purifier in an oven, place the honeycomb ceramics in the vacuum coating equipment, and then place the slurry mixture obtained in step (1) in the vacuum coating equipment Slurry the honeycomb ceramics; the drying temperature in the oven is 120°C±5°C, and the drying time is 45±10 minutes.

[0036] (3), the cellular ceramics obtained in step (2) is placed in a centrifuge for desizing, and the desizing speed of the centrifuge is 1500 r...

Embodiment 3

[0043] (1), put the water of 5000 parts by weight and the concentrated nitric acid of 28 parts by weight respectively in the container of beating equipment, then the parts by weight are respectively: aluminum oxide 1500, calcium carbonate 100, magnesium nitrate 90, cerium oxide 300, zirconium oxide 100. Put lanthanum nitrate 150, nickel oxide 60, tin oxide 60, and potassium nitrate 40 into the container of the beating equipment, stir the above mixture evenly to obtain a slurry mixture, in which aluminum oxide, cerium oxide, zirconium oxide, nickel oxide, oxide The particle size of tin is below 5 microns;

[0044] (2) After drying the honeycomb ceramics in the car purifier in an oven, place the honeycomb ceramics in the vacuum coating equipment, and then place the slurry mixture obtained in step (1) in the vacuum coating equipment Slurry the honeycomb ceramics; the drying temperature in the oven is 120°C±5°C, and the drying time is 45±10 minutes.

[0045] (3), the cellular ceram...

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Abstract

The present invention provides a catalyst for purifying automobile tail gas and the production process of the carrier with the catalyst. The catalyst consists of alumina, calcium carbonate, magnesium nitrate, cerium oxide, lanthanum nitrate and platinum, rhodium and platinum in catalytic amount. The production process includes mixing water, concentrated nitric acid and the said components inside a pulping apparatus to form slurry mixture; painting cellular ceramic after stoved with the slurry mixture and desizing in a centrifuge; stoving and roasting in an electrothermal furnace; and soaking in processing liquid and roasting. The present invention provides one kind of automobile tail gas purifying catalyst with low cost, high performance and high processing efficiency.

Description

technical field [0001] The invention relates to a catalyst for purifying exhaust gas of an automobile and a method for manufacturing a carrier using the catalyst. Background technique [0002] With the rapid development of the economy, the production and ownership of automobiles in the world are increasing day by day, and the resulting emission of automobile exhaust is also increasing. Especially in areas with many vehicles, automobile exhaust has become the main source of local air pollution. And it will cause adverse effects on the health of local residents, and the incidence of various diseases related to air pollution will increase. Therefore, it is necessary to reduce various harmful substances emitted by automobile exhaust. However, the performance of existing automobile exhaust purification catalysts is not stable enough, and the light-off temperature is relatively high. Due to the large amount of precious metals used, the cost is also relatively high. Contents of t...

Claims

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Application Information

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IPC IPC(8): B01D53/94B01J23/63
Inventor 王展张剑仲
Owner 张剑仲
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