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A kind of preparation method of molecular sieve-based scr catalyst

An SCR catalyst, molecular sieve-based technology, applied in the field of automobile exhaust purification and diesel engine exhaust catalytic purification, can solve the problems of low catalytic coating loading and easy to fall off, and achieves increased coating loading, low peeling rate, and improved adhesion. the effect of strength

Active Publication Date: 2018-05-15
凯龙蓝烽新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a molecular sieve-based SCR catalyst to overcome the shortcomings of the prior art in that the catalytic coating load is low and easy to fall off. Compared with the prior art, the preparation method is simple and the production cost is low. Easy to realize process control, conducive to industrial production

Method used

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  • A kind of preparation method of molecular sieve-based scr catalyst

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Effect test

Embodiment 1

[0022] Under stirring conditions, 7.0g of ammonia water was added to 180.0g of deionized water, 10.0g of zirconium nitrate was added dropwise to the above ammonia solution, and then 4.0g of oxalic acid was added to obtain translucent zirconium oxalate sol; 50.0g of aluminum isopropoxide Add the zirconium oxalate sol prepared in the above steps, add nitric acid to adjust the pH value to 3.0, heat the above mixed solution to 60°C, and stir for 1 h to obtain Al 2 o 3 -ZrO 2 Composite sol; add 120.0g ZSM-5 molecular sieve and 20.0g deionized water to the composite sol prepared in the above steps and mix, ball mill for 6 hours to obtain the coating slurry; impregnate the honeycomb ceramics into the above coating slurry, take out Finally, blow off the remaining slurry in the channels, dry at 100°C for 5 hours, repeat the impregnation and drying three times, and finally bake at 500°C for 3 hours to obtain the selective reduction (SCR) catalyst.

Embodiment 2

[0024] Under stirring conditions, 6.7g of ammonia water was added to 130.0g of deionized water, 10.0g of zirconium nitrate was added dropwise to the above ammonia solution, and then 3.3g of oxalic acid was added to obtain translucent zirconium oxalate sol; 50.0g of aluminum isopropoxide Add the zirconium oxalate sol prepared in the above steps, add nitric acid to adjust the pH value to 3.0, heat the above mixed solution to 60°C, and stir for 1 h to obtain Al 2 o 3 -ZrO 2 Composite sol; 90.0g Beta molecular sieve and 20.0g deionized water were added to the composite sol prepared in the above steps and mixed, ball milled for 8 hours to obtain coating slurry; the honeycomb ceramics were impregnated into the above coating slurry, taken out and blown Dried at 120°C for 4 hours to get rid of the remaining slurry in the pores, repeated impregnation and drying three times, and finally baked at 550°C for 2 hours to obtain a selective reduction (SCR) catalyst.

Embodiment 3

[0026] Under stirring conditions, 7.2g of ammonia water was added to 160.0g of deionized water, 10.0g of zirconium nitrate was added dropwise to the above ammonia solution, and 4.5g of oxalic acid was added to obtain translucent zirconium oxalate sol; 55.0g of aluminum isopropoxide Add to the zirconium oxalate sol prepared in the above steps, add nitric acid to adjust the pH value to 3.5, heat the above mixed solution to 70°C, and stir for 1.5h to obtain Al 2 o 3 -ZrO 2 Composite sol; add 108.0g Y-type molecular sieve and 20.0g deionized water to the composite sol prepared in the above steps and mix, ball mill for 10 hours to obtain the coating slurry; impregnate the honeycomb ceramics into the above coating slurry, take it out Blow out the remaining slurry in the channels, dry at 130°C for 3 hours, repeat impregnation and drying three times, and finally bake at 550°C for 2 hours to obtain a selective reduction (SCR) catalyst.

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Abstract

The invention discloses a preparation method of a molecular sieve-based SCR catalyst, comprising the following steps: (1) adding Zr(NO3)4 dropwise to ammonia water under stirring conditions, adding oxalic acid to obtain a translucent zirconium oxalate sol; 2) adding aluminum isopropoxide to the zirconium oxalate sol prepared in the above step (1), adding nitric acid to adjust the pH value, heating the above mixed solution, and stirring to obtain Al2O3-ZrO2 composite sol; (3) adding deionized water and molecular sieves Mix in the composite sol prepared in the above step (2), put it into a ball mill and ball mill to obtain the coating slurry; (4) impregnate the honeycomb ceramics into the above coating slurry, take it out and blow off the remaining slurry in the channel, The impregnation and drying were repeated three times, and finally the catalyst was calcined to obtain the monolithic selective reduction (SCR) catalyst. The selective reduction (SCR) catalyst prepared by the invention has high loading capacity, uniform coating and low shedding rate.

Description

technical field [0001] The invention relates to the technical field of automobile tail gas purification, in particular to a method for preparing a catalyst applicable to the catalytic purification of diesel engine tail gas and the like. Background technique [0002] With the rapid development of the automobile industry, the number of automobiles in my country continues to increase. Compared with gasoline vehicles, diesel vehicles have attracted widespread attention due to their advantages of more energy saving and less greenhouse gas emissions. However, while people enjoy the benefits brought by diesel vehicles, the pollution problems caused by exhaust emissions are also becoming more and more severe. In recent years, the solution to the pollution caused by nitrogen oxides in the exhaust of diesel vehicles has been highly valued by all parties, and the method of catalytic exhaust purification has been widely used as an effective means to reduce exhaust pollution. And with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40B01J29/70B01J29/18B01J29/08B01D53/94
Inventor 孙敏王翔朱增赞郭耘詹望成张志刚卢冠忠
Owner 凯龙蓝烽新材料科技有限公司
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