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Preparation method and coating method of molecular sieve coating

A molecular sieve and coating technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of easy peeling off and low coating load, and achieve uniform coating, uniform appearance, The effect of high firmness

Active Publication Date: 2015-04-22
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art that the coating load is low and easy to fall off, the invention provides a method for preparing and coating the molecular sieve coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Mix 12.3g ammonia water and 200g deionized water, heat to 80℃, and then add 10g Zr(NO 3 ) 4 Add dropwise to ammonia water, stir for 30min, then add 2.93g oxalic acid, stir for 30min at 90℃, aging, and obtain stable and transparent zirconium oxalate sol;

[0027] (2) Add 24g of pseudo-boehmite to 376g of deionized water, then slowly add 12.1g of nitric acid dropwise. After clarification, add the sol of step (1), heat, and add oxalic acid to adjust the pH=0.9, stir and age To make Al 2 O 3 -ZrO 2 Composite sol

[0028] (3) Combine 50g deionized water, 70g ZSM-5 molecular sieve and Al prepared above 2 O 3 -ZrO 2 80g of the composite sol is mixed and put into a ball mill for ball milling for 8 hours to obtain a slurry;

[0029] (4) Immerse the cordierite honeycomb ceramic carrier in the slurry of step (3), take it out and blow out the residual liquid in the pores, dry at 200°C, repeat the immersion and drying twice, in a muffle furnace at 550°C After calcination for 4 hours, ...

Embodiment 2

[0031] (1) Mix 12.3g ammonia water and 200g deionized water, heat to 80℃, and then add 10g Zr(NO 3 ) 4 Add dropwise to ammonia water, stir for 30 minutes, then add 1.05 g of oxalic acid, stir at 90°C for 30 minutes, and age to obtain stable and transparent zirconium oxalate sol;

[0032] (2) Add 24g of pseudo-boehmite to 376g of deionized water, then slowly add 12.1g of nitric acid dropwise. After clarification, add the sol of step (1), heat, and add oxalic acid to adjust the pH=0.9, stir and age To make Al 2 O 3 -ZrO 2 Composite sol

[0033] (3) Combine 50g deionized water, 70g ZSM-5 molecular sieve and Al prepared above 2 O 3 -ZrO 2 80g of the composite sol is mixed and put into a ball mill for ball milling for 8 hours to obtain a slurry;

[0034] (4) Immerse the cordierite honeycomb ceramic carrier in the slurry of step (3), take it out and blow out the residual liquid in the pores, dry at 200°C, repeat the immersion and drying twice, in a muffle furnace at 550°C After sintering ...

Embodiment 3

[0036] (1) Mix 12.3g ammonia water and 200g deionized water, heat to 80℃, and then add 10g Zr(NO 3 ) 4 Add dropwise to ammonia water, stir for 30min, then add 4.22g of oxalic acid, stir for 30min at 90℃, and age to obtain stable and transparent zirconium oxalate sol;

[0037] (2) Add 24g pseudo-boehmite to 376g deionized water, then slowly add 12.1g nitric acid dropwise, after clarification, add the sol of step (1), heat, and add oxalic acid to adjust the pH=0.9, stir and Aging, made into Al 2 O 3 -ZrO 2 Composite sol

[0038] (3) Combine 50g deionized water, 70g ZSM-5 molecular sieve and Al prepared above 2 O 3 -ZrO 2 80g of composite sol is mixed and put into a ball mill for ball milling for 8 hours to obtain slurry;

[0039] (4) Immerse the cordierite honeycomb ceramic carrier in the slurry of step (3), take it out and blow out the residual liquid in the pores, dry at 200°C, repeat the immersion and drying twice, in a muffle furnace at 550°C After calcination for 4...

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Abstract

The invention discloses a preparation method of a molecular sieve type monolithic catalyst. The preparation method of the molecular sieve type monolithic catalyst has the advantage that the purposes of improving the activity of the catalyst and widening the temperature window of the catalyst are achieved by combining a plurality of molecular sieve active coatings on a catalyst due to the adoption of different activities of different molecular sieve type catalysts in NOx selective catalytic reduction reaction. The preparation method of the molecular sieve type monolithic catalyst comprises the following steps: preparing Fe modification ZSM-5 molecular sieves and NH4-ZSM-5 molecular sieves into corresponding slurries, then respectively coating the slurries on one end of a cordierite honeycomb ceramic carrier to prepare a molecular sieve type monolithic catalyst applied to selective catalytic reduction of nitric oxides. The catalyst prepared by the method has high activity of selective catalytic reduction of nitric oxides; the performance of the catalyst is superior to that of the molecular sieve type monolithic catalyst which only takes the Fe modification ZSM-5 molecular sieves and the NH4-ZSM-5 molecular sieves as active coatings; the conversation rate of NOx in a temperature zone of 190-490 DEG C can reach over 80%; and the catalyst is simple in preparation method and relatively low in production cost.

Description

Technical field [0001] The invention relates to a method for preparing and coating a molecular sieve coating, in particular to a method for preparing an active coating of a honeycomb ceramic catalyst which can be applied to the fields of diesel engine exhaust denitration technology and catalytic purification. It belongs to the technical field of catalyst material preparation. Background technique [0002] With the continuous increase in the number of vehicles in my country, the pollution caused by vehicle exhaust emissions to the atmospheric environment in China is becoming more and more serious, and it has become one of the primary sources of air pollutants in large and medium cities. Among them, diesel vehicles have become the NOx and PM emissions of motor vehicles in my country. The main contributors. In order to effectively control the emission of exhaust pollutants from diesel vehicles, two main pollutants must be post-treated, namely particulate matter filtration technology...

Claims

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Application Information

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IPC IPC(8): B01J29/06B01J29/08B01J29/40B01J37/02
Inventor 詹望成王翔郭耘郭杨龙卢冠中王丽王艳芹王筠松刘晓晖
Owner EAST CHINA UNIV OF SCI & TECH
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