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Engine tail gas treater with microwave technology used and the catalyst and its prepn process

An exhaust gas treatment and engine technology, applied in chemical instruments and methods, physical/chemical process catalysts, engine components, etc., can solve the problems of catalyst aging, poor exhaust gas purification effect, and high light-off temperature

Inactive Publication Date: 2003-09-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the "three-way" catalyst in the prior art can solve the problem of purifying the exhaust of diesel engines, especially automobiles, due to its poor low-temperature activity and high light-off temperature (generally greater than 200°C), the exhaust purification effect is relatively poor when the automobile is cold-started. Difference
And the precious metals used (such as platinum, rhodium, etc.) are expensive, facing the problem of resource depletion
Moreover, after the catalyst has been used for a period of time, since the surface of the catalyst will be covered by pollutants such as soot particles (PM), the catalytic effect will be reduced, resulting in the so-called catalyst aging problem.

Method used

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  • Engine tail gas treater with microwave technology used and the catalyst and its prepn process
  • Engine tail gas treater with microwave technology used and the catalyst and its prepn process
  • Engine tail gas treater with microwave technology used and the catalyst and its prepn process

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Take a certain amount of cerium nitrate to make a 4% solution, put the porous ceramic carrier into it, soak for 5 hours, then take it out, use absorbent cotton to make it dry in the air at room temperature for 12 hours, then place it in the air at 60 Dry in an oven for 3 hours at a temperature of ℃, and then calcinate in a high-temperature furnace for 2 hours at a temperature of 250°C. Take it out after cooling with the furnace, then put it into a mixed solution of copper nitrate and manganese nitrate (the concentration of copper nitrate is 3%, and the concentration of manganese nitrate is 1.5%) to soak for 5 hours, then take it out, and use absorbent cotton to make it dry in the air. Dry in the shade at room temperature for 12 hours, dry in an oven at 60°C for 3 hours, and then calcinate in a high-temperature furnace at 250°C for 2 hours. Take it out after cooling with the furnace, so that the catalyst of the present invention is prepared on the carrier. After detecti...

Embodiment 2

[0053] Take a certain amount of cerium nitrate to make a 4% solution, put the porous ceramic carrier into it, soak for 5 hours, then take it out, use absorbent cotton to make it dry in the air at room temperature for 12 hours, then place it in the air at 60 Dry in an oven for 3 hours at a temperature of ℃, and then calcinate in a high-temperature furnace for 2 hours at a temperature of 250°C. Take it out after cooling with the furnace, and then take a certain amount of copper nitrate, platinum nitrate, rhodium nitrate and palladium nitrate to make 8%, 1%, 1.5% and 2% solutions respectively, and mix them. Then put the carrier into it, soak for 15 hours, then take it out, use absorbent cotton to dry it in the air at room temperature for 20 hours, then dry it in the air at 150°C for 2 hours, and then dry it in the air at 300°C Calcined at high temperature for 1 hour, then took out after cooling with the furnace. Finally, at a temperature of 400°C, it was reduced with hydrogen fo...

Embodiment 3

[0055] Take a certain amount of cerium nitrate to make a 12% solution, then put the carrier into it, soak for 7 hours, then take it out, use absorbent cotton to dry it in the air at room temperature for 18 hours, and then put it in the air at 70 ° C Dry it in an oven at high temperature for 2 hours, then calcinate it in a high-temperature furnace at a temperature of 300°C for 2.5 hours, and take it out after cooling with the furnace. Then, put it into the mixed solution of copper nitrate and palladium chloride (the concentration of copper nitrate is 15%, the concentration of palladium chloride is 2.5%) and soak for 7 hours, then take it out, utilize absorbent cotton to make it in the air at room temperature Dry in the shade for 18 hours, dry in an oven at 70°C for 2 hours, and then calcinate in a high-temperature furnace at 300°C for 2.5 hours. Take it out after cooling with the furnace, and finally reduce it with hydrogen at a temperature of 350°C for 1.5 hours. In this way,...

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Abstract

The present invention relates to one microwave treater capable of purifying engine exhaust gas under the action of its microwve field and the metal catalyst used in the ceramic carrier of the microwave treater and its preparation process. The catalyst carried on the ceramic carrier to catalyst the exhaust gas pufiying chemical reaction includes the oxide of Cu, Ce, Mn, Co, V and other metals and noble metals. The catalyst can catalyze the reduction reaction of Co, HC, NOx etc. effectively while the microwave treater under the action of the microwave makes the carbon particles exhausted by the diesel engine and adsorbed onto the surface of the carrier to regenerate the catalyst. The present invention can solve the problem of exhaust gas pollution, raise efficiency of catalytic reaction and save energy.

Description

technical field [0001] The invention relates to a microwave processor capable of purifying exhaust gas from diesel and gasoline engines under the action of a microwave field, a metal catalyst used on a ceramic carrier of the microwave processor, and a preparation method of the metal catalyst. technical background [0002] Since the advent of diesel engines, they have been widely used in various power devices, such as automobiles, ships and generators, due to their good power, economy and durability. Especially since the 1990s, the number of diesel vehicles in the world has increased rapidly, and the development momentum of diesel vehicles in my country has also been very rapid since the mid-1980s. However, due to the increasingly serious air pollution caused by diesel exhaust emissions, the development of diesel engines is greatly restricted. The main pollutants in diesel engine exhaust that are controlled by emission regulations are CO, HC, and NO x (Here mainly includes ...

Claims

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Application Information

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IPC IPC(8): B01D53/94B01J23/89F01N3/28
Inventor 韩炜陈岳吴通好龚依民黄光寰
Owner JILIN UNIV
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