Catalyst for combustion of soot particles in diesel vehicle exhaust, and preparation method thereof

A soot particle and catalyst technology, which is applied in the field of combustion temperature catalyst and its preparation, can solve the problems of high NOx and particulate matter emissions, health hazards, etc., and achieve the effects of fast combustion speed, low production cost, and easy control of the reaction process

Inactive Publication Date: 2012-09-12
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the NOx and particulate matter (PM) emissions of diesel engines are relatively high, especially the PM emissions are about 70 times that of gasoline vehicles, and some are even as high as 100 times, which has brought serious harm to the health of the earth and human beings.

Method used

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  • Catalyst for combustion of soot particles in diesel vehicle exhaust, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 0.101g of potassium nitrate KNO to a 200ml beaker 3 , 3.04g cerous nitrate Ce (NO 3 ) 3 ·6H 2 O, 0.537g manganese nitrate Mn(NO 3 ) 2 , and 10ml of deionized water to dissolve, then add 2.732g of citric acid under stirring at room temperature, then add 0.32g of polyethylene glycol (molecular weight 400) after dissolving, after the dropwise addition, heat and stir at 75-80°C until the moisture Evaporates to form a viscous gel. Then the obtained colloid was dried in an air atmosphere at 110°C for 24 hours overnight, and after drying, it was taken out and ground into fine powder, and placed in a muffle furnace for calcination at 600°C for 4 hours, and the composite oxide catalyst K was obtained after the furnace was cooled. 0.1 / C 0.7 mn 0.3 o 2 .

[0015] The catalyst obtained above was mixed with soot (Printex-U, Degussa) at a mass ratio of 10:1 in an agate mortar for 2 min by gently scraping with a spatula to simulate the loose contact conditions between th...

Embodiment 2

[0018] Add 0.202g potassium nitrate KNO to a 200ml beaker 3 , 3.04g cerous nitrate Ce (NO 3 ) 3 ·6H 2 O, 0.537g manganese nitrate Mn(NO 3 ) 2 , and 10ml of deionized water to dissolve, then add 2.732g of citric acid under stirring at room temperature, then add 0.32g of polyethylene glycol (molecular weight 400) after dissolving, after the dropwise addition, heat and stir at 75-80°C until the moisture Evaporates to form a viscous gel. Then the obtained colloid was dried in an air atmosphere at 110°C for 24 hours overnight, after drying, it was taken out and ground into fine powder, and placed in a muffle furnace for calcination at 600°C for 4 hours, and the composite oxide catalyst K was obtained after the furnace was cooled. 0.2 / C 0.7 mn 0.3 o 2 .

[0019] As in Example 1, the catalyst obtained above was mixed with soot (Printex-U, Degussa) at a mass ratio of 10:1 in an agate mortar for 2 min by gently scraping with a spatula to simulate the loose contact conditions ...

Embodiment 3

[0021] Add 0.303g potassium nitrate KNO to a 200ml beaker 3 , 3.04g cerous nitrate Ce (NO 3 ) 3 ·6H 2 O, 0.537g manganese nitrate Mn(NO 3 ) 2 , and 10ml of deionized water to dissolve, then add 2.732g of citric acid under stirring at room temperature, then add 0.32g of polyethylene glycol (molecular weight 400) after dissolving, after the dropwise addition, heat and stir at 75-80°C until the moisture Evaporates to form a viscous colloid. Then the obtained colloid was dried in an air atmosphere at 110°C for 24 hours overnight, and after drying, it was taken out and ground into fine powder, and placed in a muffle furnace for calcination at 600°C for 4 hours, and the composite oxide catalyst K was obtained after the furnace was cooled. 0.3 / C 0.7 mn 0.3 o 2 .

[0022] Measure the combustion situation of soot by the same method of embodiment 1, Tm is 420 ℃ under this catalyst, CO 2 The selectivity was 97%.

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Abstract

The invention provides a rare earth oxide and transition metal oxide-supported alkali metal catalyst for reducing the combustion temperature of soot particles in diesel vehicle exhaust, and a preparation method thereof. The preparation method is characterized in that non-noble metal salts are taken as raw materials, the sol-gel method is employed as the preparation technology, and the preparation process is easy to control. Soluble salts of rare earth Ce, transition metal Mn and alkali metal K are taken as precursors and the mass percents of Ce, Mn and K are adjusted to obtain the K/CeO2-MnO2 catalyst. In a bulk contact condition, the combustion temperature of the soot can be reduced from 575 DEG C in absent of a catalyst to 395 DEG C in present of the catalyst, thereby meeting the temperature range of the diesel vehicle exhaust. The catalyst is a catalyst which is capable of removing the soot in the diesel vehicle exhaust effectively.

Description

1. Technical field [0001] The invention belongs to the technical field of diesel vehicle exhaust catalyst preparation, and in particular relates to a catalyst capable of reducing the combustion temperature of soot particles in diesel vehicle exhaust and a preparation method thereof. 2. Background technology [0002] Due to the dwindling of oil resources and the increasing tendency of global warming, diesel vehicles are widely used in various power plants, trucks, locomotives, ships and other large equipment due to their low fuel consumption, low emissions, high power, and good durability. It is increasingly widely used and has broad development prospects. However, the NOx and particulate matter (PM) emissions of diesel engines are relatively high, especially the PM emissions are about 70 times that of gasoline vehicles, and some are even as high as 100 times, which has brought serious harm to the health of the earth and human beings. The combustion characteristics of diesel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34
Inventor 郭耘吴迪王丽孙敏卢冠忠张志刚詹望成郭杨龙王筠松
Owner EAST CHINA UNIV OF SCI & TECH
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