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A method for preparing and coating molecular sieve coating

A molecular sieve and coating technology, used in molecular sieve catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of low coating loading and easy falling off, and achieve uniform appearance, uniform coating, Simple preparation method

Active Publication Date: 2019-04-23
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 of ammonia water and 200g of deionized water, heat to 80°C, and then add 10g of Zr(NO 3 ) 4 Add dropwise to ammonia water, stir for 30 minutes, then add 2.93g oxalic acid, stir at 90°C for 30 minutes, age to obtain a stable and transparent zirconium oxalate sol;

[0027] (2) Add 24g of pseudo-boehmite in 376g of deionized water, then slowly add 12.1g of nitric acid dropwise, after clarification, add the sol of step (1), heat, add oxalic acid at the same time to adjust pH=0.9, stir and age into Al 2 o 3 -ZrO 2 Composite sol;

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

[0029] (4) Immerse the cordierite honeycomb ceramic carrier in the slurry of step (3), blow off the residual liquid in the channel after taking it out, dry it at 200°C, repeat the dipping and drying twice, and put it in a muffle fur...

Embodiment 2

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

[0032] (2) Add 24g of pseudo-boehmite in 376g of deionized water, then slowly add 12.1g of nitric acid dropwise, after clarification, add the sol of step (1), heat, add oxalic acid at the same time to adjust pH=0.9, stir and age into Al 2 o 3 -ZrO 2 Composite sol;

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

[0034] (4) Immerse the cordierite honeycomb ceramic carrier in the slurry of step (3), blow off the residual liquid in the channel after taking it out, dry it at 200°C, repeat the dipping and drying twice, and put it in a muffle furn...

Embodiment 3

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

[0037] (2) Add 24g of pseudoboehmite in 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 pH=0.9 at the same time, stir and Aging, made of Al 2 o 3 -ZrO 2 Composite sol;

[0038] (3) 50g deionized water, 70gZSM-5 molecular sieve and the Al prepared above 2 o 3 -ZrO 2 80g of the composite sol was mixed, put into a ball mill and milled for 8 hours to obtain a slurry;

[0039] (4) Immerse the cordierite honeycomb ceramic carrier in the slurry of step (3), blow off the residual liquid in the channel after taking it out, dry it at 200°C, repeat the dipping and drying twice, and put it in a m...

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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 that can be applied to the fields of denitrification technology, catalytic purification, and the like of diesel engine exhaust. The invention belongs to the technical field of catalyst material preparation. Background technique [0002] With the continuous growth of the number of automobiles in China, the pollution caused by automobile exhaust emissions to my country's atmospheric environment is also becoming more and more serious, and has become one of the primary sources of air pollutants in large and medium-sized cities. main contributors. In order to effectively control the emission of diesel vehicle exhaust pollutants, two main pollutants must be post-treated, namely particulate filter technology and NOx reducing catalytic reduction (SCR) technology. For the NOx reductive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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