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Process for preparing honeycomb-shaped SCR catalyst for purifying diesel car tail gas

An SCR catalyst and exhaust gas purification technology, which is applied in catalyst activation/preparation, physical/chemical process catalyst, molecular sieve catalyst, etc., can solve the problems of many by-products, narrow temperature range, low catalytic activity, etc., and achieves a simple preparation method, The effect of low cost and high catalytic activity

Inactive Publication Date: 2009-05-20
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, to a certain extent, it also makes up for the existing catalysts used to purify diesel vehicle exhaust nitrogen oxides. The catalytic activity is low, the temperature range with high activity is narrow, and more by-products are produced during the purification process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add in 30L deionized water (NH 4 ) 6 Mo 7 O 24 ·4H 2 O 0.194kg, add 2kg SiO after stirring to dissolve 2 / Al 2 O 3 =38 (parts ratio) of HZSM-5, keep the temperature at 60℃ in a constant temperature water bath, stir by electric until the moisture in the beaker evaporates, put it in an oven at 120℃ for about 12h, and then roast in a muffle furnace at 600℃ 5h, get Mo / ZSM-5;

[0015] Then the Mo / ZSM-5 sample and a sufficient amount of anhydrous FeCl 3 Place them on both ends of the U-shaped quartz tube, heat to 120°C at a rate of 10°C / min under 30ml / min of argon, and hold for 10h; then heat to 320°C and hold for 4h to make the sample uniform Yellow; fully washed with deionized water and suction filtered; dried at 110°C for 12h; baked at 550°C for 4h to obtain Fe-Mo / ZSM-5 powder sample;

[0016] At 1.8LHO-CH 2 -CH 2 -Add 8g of Al(NO 3 ) 3 .9H 2 O stir evenly, then add 0.2kg of the Fe-Mo / ZSM-5 powder prepared above, and mix well after thorough stirring. Put the honeycomb cordieri...

Embodiment 2

[0019] The preparation conditions and preparation procedures are the same as in Example 1. The ratio of silicon to aluminum of HZSM-5 is: SiO 2 / Al 2 O 3 =50 (molecular ratio). Add in 30L deionized water (NH 4 ) 6 Mo 7 O 24 ·4H 2 O 0.194kg, add 2kg of SiO after stirring to dissolve 2 / Al 2 O 3 =50 (molecular ratio) of HZSM-5, keep the temperature at 60℃ in a constant temperature water bath, stir by electric until the moisture in the beaker evaporates, put it in a 120℃ oven for about 12h, and then roast in a muffle furnace at 600℃ for 5h , Get Mo / ZSM-5;

[0020]Then the Mo / ZSM-5 sample and a sufficient amount of anhydrous FeCl 3 Place them on both ends of the U-shaped quartz tube, heat to 120°C at a rate of 10°C / min under 30ml / min of argon, and hold for 10h; then heat to 320°C and hold for 4h to make the sample uniform Yellow; fully washed with deionized water and suction filtered; dried at 110°C for 12h; baked at 550°C for 4h to obtain Fe-Mo / ZSM-5 powder sample;

[0021] Add 8g of...

Embodiment 3

[0024] The preparation conditions and preparation procedures are the same as in Example 1, which shortens the ion exchange time and thereby reduces the Fe content. Add in 30L deionized water (NH 4 ) 6 Mo 7 O 24 ·4H 2 O 0.194kg, add 2kg SiO after stirring to dissolve 2 / Al 2 O 3 =38 (molecular ratio) HZSM-5, keep the temperature in a constant temperature water bath at 60℃, electric stirring until the water in the beaker evaporates, put it in a 120℃ oven for about 12h, and then roast in a muffle furnace at 600℃ for 5h , Get Mo / ZSM-5;

[0025] Then the Mo / ZSM-5 sample and a sufficient amount of anhydrous FeCl 3 Place them on both ends of the U-shaped quartz tube and heat to 120°C at a temperature increase rate of 10°C / min under 30ml / min of argon for 10 hours; then heat to 320°C for 2 hours to make the sample uniform Yellow; fully washed with deionized water and suction filtered; dried at 110°C for 12h; baked at 550°C for 4h to obtain Fe-Mo / ZSM-5 powder sample;

[0026] Add 8g of Al(N...

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PUM

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Abstract

The invention provides a diesel truck tail gas cleaning catalyst and a method for preparing the same. The cleaning catalyst is used for controlling pollutions caused by the tail gas of the diesel truck and a lean-burn gasoline locomotive. Under the condition that the temperature is between 260 and 550 DEG C and the idle speed is between 60, 000 and 80, 000 per hour, the cleaning catalyst is used for performing a catalytic activity test on a sample for a plurality of times, all the NO conversion rates reach more than 95 percent, and the highest rate is 100 percent; and after a 500-hour life test, the catalytic activity of the cleaning catalyst is not affected at all, and the cleaning catalyst has the characteristics of water resistance, low cost and simple preparation method; besides, the cleaning catalyst is particularly suitable for the purifying treatments of the tail gas of various diesel trucks.

Description

Technical field [0001] The invention relates to a preparation method of a catalyst for purification of automobile exhaust, in particular, a preparation method of a honeycomb SCR catalyst for treating exhaust pollution of diesel vehicles and lean-burn gasoline engines. Background technique [0002] Diesel vehicle exhaust nitrogen oxides are currently one of the main sources of air pollution. The existing three-way catalyst used in the treatment of gasoline vehicle exhaust nitrogen oxides loses its ability to reduce nitrogen oxides sharply under high air-fuel ratio conditions. The purification effect is not suitable for the purification of nitrogen oxides in the exhaust of diesel vehicles. At the same time, in order to meet the fuel economy and reduce CO 2 The demand for displacement, the use of diesel vehicles will increase. Therefore, how to effectively remove NO from diesel vehicle exhaust x It has become an urgent problem that needs to be solved. [0003] Selective Catalytic Re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01J29/48B01J35/04B01J37/02
CPCY02T10/24Y02A50/20Y02T10/12
Inventor 李哲安霞黄伟谢克昌
Owner TAIYUAN UNIV OF TECH
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