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High temperature honeycomb catalyst and preparation method thereof

A honeycomb catalyst, high temperature technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex preparation process, poor high temperature thermal shock resistance, and unavailability of active components. Simple preparation process, easy to control effect

Active Publication Date: 2020-05-22
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above problems in the preparation of the denitration catalyst and its preparation method are as follows: (1) low NOx activity at high temperature; (2) poor thermal shock resistance at high temperature; (3) internal active components cannot be utilized, resulting in waste of catalytic active components and preparation High cost; (4) The preparation process is complicated

Method used

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  • High temperature honeycomb catalyst and preparation method thereof
  • High temperature honeycomb catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Preparation of honeycomb ceramic body

[0019] Put 5.5kg of kaolin, 2.0kg of Beta25 molecular sieve, 0.5kg of mullite fiber, 2.0kg of aluminum dihydrogen phosphate, 0.3kg of methyl cellulose, 0.3kg of tung oil, 0.3kg of glycerin and 2kg of water into a kneader and knead for 3 hours to form mud; then put the mud into a vacuum mud refining machine for mud refining, and the mixing time is 4 hours; after that, wrap the mud that has been vacuum smelted with plastic wrap, put it in a cool and humid air for 18 hours, and make The mud billet with good plasticity; put the stale mud billet into the extruder for extrusion molding, the extrusion pressure is 23Mpa, make the mud billet pass through the bottom surface diameter of 18cm, 200 mesh stainless steel mold, and then cut into the desired shape with molybdenum wire For the honeycomb ceramic wet green body that needs the length, put the green body into the microwave for drying and shaping quickly, the drying temperature is 1...

Embodiment 2

[0027] (1) Preparation of honeycomb ceramic body

[0028] Put 5.5kg kaolin, 1.7kg Sapo-34 molecular sieve, 0.3kg mullite fiber, 2.5kg glass powder, 0.4kg hydroxypropyl methylcellulose, 0.3kg tung oil, 0.3kg glycerin and 2.5kg water into the mud kneader Mix for 8 hours to make mud; then put the mud into a vacuum mud mill for 1 hour; then wrap the mud after vacuum refining with plastic wrap and put it in a cool and humid air After aging for 24 hours, the mud billet with good plasticity is obtained, put the mud billet into the extruder for extrusion molding, the extrusion pressure is 23Mpa, make the mud billet pass through a 200-mesh stainless steel mold with a bottom diameter of 18cm, and then cut it with a molybdenum wire The honeycomb ceramic wet green body of the required length is quickly placed in the microwave at 105°C for drying and shaping, until it is completely dry, the end surface processing is carried out. Sintering at 580°C for 3 hours, after sintering, the honeyco...

Embodiment 3

[0032] (1) Preparation of honeycomb ceramic body

[0033] Put 6kg attapulgite, 0.8kg SSZ-13 molecular sieve, 0.2kg mullite fiber, 3.0kg silica sol, 0.3kg hydroxyethyl cellulose, 0.3kg tung oil, 0.3kg glycerin and 0.5kg water into the kneader and mix Refining for 4 hours to make mud; then put the mud into a vacuum mud refining machine for 2 hours of mud refining; after that, wrap the mud after vacuum refining with plastic wrap and put it in a cool and humid air to stale for 20 hours to obtain good plasticity. Put the stale mud into the extruder for extrusion molding, the extrusion pressure is 23Mpa, make the mud pass through the bottom diameter of 18cm, 200 mesh stainless steel mold, and then cut it into the required length with molybdenum wire The honeycomb ceramic wet green body, quickly put the green body into the microwave at 110 ° C for drying and shaping, until it is completely dry, carry out end surface processing; 580 ° C, sintering for 4 hours, after sintering, use com...

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Abstract

The invention relates to a high-temperature honeycomb catalyst and a preparation method thereof. It is characterized in that a honeycomb ceramic body is first prepared, and then the honeycomb ceramic body is immersed in a mixed system of multi-component metal ions and ammonium carbamate at a certain temperature, and is subjected to high-temperature combustion treatment to obtain a honeycomb catalyst. The purpose of the present invention is to provide a high-temperature honeycomb catalyst and a preparation method thereof. The NOx conversion rate of the honeycomb catalyst prepared by the present invention is higher than 78% at 230 to 535°C, and the NOx conversion rate at 535°C is 79.8%, showing a good It has high temperature NOx activity, and also has the advantages of high coating firmness, uniform distribution of active components, and thermal shock resistance. The preparation process of the invention is simple and easy to control.

Description

technical field [0001] The invention relates to a high-temperature honeycomb catalyst and a preparation method thereof, and belongs to the technical field of automobile emission, in particular to the field of catalyst preparation for SCR denitrification. Background technique [0002] In order to meet NOx emission regulations, in-machine purification and after-treatment technologies are essential. At present, SCR technology has become the first choice for medium and heavy-duty diesel engine enterprises to reduce NOx technology. The principle is that when the ammonia gas produced by the hydrolysis of urea and the NOx in automobile exhaust pass through the carrier coated with active coating, NOx is quickly reduced to nitrogen by ammonia gas. The reason why water, ammonia and NOx can undergo rapid chemical reactions on the post-treatment carrier is inseparable from the composition of the catalyst on the carrier. The role of the carrier is not only to bear the coating and the ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/76B01J29/46B01J29/85B01J35/04B01D53/94B01D53/56
CPCB01D53/9418B01J29/46B01J29/76B01J29/7615B01J29/85B01J2229/186B01J35/56
Inventor 崔龙于力娜韩建张克金张斌胥州苏中辉
Owner CHINA FIRST AUTOMOBILE
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