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Extrusion molecular sieve honeycomb catalyst and preparation method thereof

A technology of honeycomb catalyst and molecular sieve, which is applied in the direction of molecular sieve catalyst, catalyst activation/preparation, chemical instruments and methods, etc. It can solve the problems of easy peeling off of the coating, complicated preparation process, improvement, etc., achieve good De-NOx activity, overcome coating Effects of layer shedding and high-efficiency loading

Active Publication Date: 2017-12-08
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned problems in the preparation of the denitration catalyst and its preparation method are as follows: (1) The internal active components cannot be utilized, resulting in waste of catalytic active components and increased production costs; (2) The temperature window of the catalyst is narrow; (3) The preparation process is complicated; (4) The coating is easy to fall off

Method used

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  • Extrusion molecular sieve honeycomb catalyst and preparation method thereof
  • Extrusion molecular sieve honeycomb catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Step 1: Preparation of Mud

[0018] 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 for 4 hours into 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 a plastic wrap, put it in a cool and humid air for 20 hours, and make Get a mud base with good plasticity;

[0019] The second step: shape the honeycomb ceramic body

[0020] 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 honeycomb ceramic wet mold of required length with molybdenum wire Green body: After the green body is extruded, put it into the microwave for drying an...

Embodiment 2

[0026] Step 1: Preparation of Mud

[0027] 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 Stale for 24 hours to make a mud base with good plasticity;

[0028] The second step: shape the honeycomb ceramic body

[0029] 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 honeycomb ceramic wet mold of required length with molybdenum wire Green body: After the green body is extruded, quickly put it into the microwave oven at 105°C for drying and shaping, until it is completely dry, the end surfac...

Embodiment 3

[0033] Step 1: Preparation of Mud

[0034] 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 mud kneader Mix 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 plasticity good mud;

[0035] The second step: shape the honeycomb ceramic body

[0036] 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 honeycomb ceramic wet mold of required length with molybdenum wire Green body; after the green body is extruded, put it into the microwave at 110°C for drying and shaping, until it is completely dry, carry...

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Abstract

The invention relates to an extrusion molecular sieve honeycomb catalyst and a preparation method of the extrusion molecular sieve honeycomb catalyst. The extrusion molecular sieve honeycomb catalyst is characterized in that a prepared honeycomb ceramic body is impregnated in a mixed solution containing cupper ions, iron ions, transition metal ions and ammonium carbamate at a certain temperature, so that the metal ions in active liquid reacts with active sites of a molecular sieve part in the honeycomb ceramic body, then active sites of residual molecular sieves are fully reacted with multicomponent metal ions through high-temperature combustion under the action of ammonium carbamate, so that active components are uniformly distributed and efficiently loaded on the surface of a carrier; the extrusion molecular sieve honeycomb catalyst has the advantages of uniform loading of the active components and low shedding rate of a coating, the conversion rates of NOx within the temperature range of 215 to 520 DEG C are all higher than 75%, and a better De-NOx effect at a wide temperature window is shown. The preparation method of the extrusion molecular sieve honeycomb catalyst is simple and easily controlled in process.

Description

technical field [0001] The invention relates to an extruded molecular sieve 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] To meet NO x Emission regulations, in-engine purification and after-treatment technology are essential. At present, SCR technology has become the first choice for medium and heavy-duty diesel engine enterprises to reduce NO x The technical route, the principle is to use the ammonia produced by the hydrolysis of urea and the NO in the automobile exhaust x When passing over a carrier coated with an active coating, NO x Quickly reduced by ammonia to nitrogen and water, ammonia and NO x The reason why the rapid chemical reaction can be carried out on the post-processing carrier is inseparable from the composition of the carrier. The carrier bears the coating and active components, and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/46B01J29/76B01J29/78B01J29/80B01J29/85B01J35/04B01J37/02B01J37/08
CPCB01J29/005B01J29/46B01J29/7615B01J29/78B01J29/7815B01J29/80B01J29/85B01J37/0203B01J37/0205B01J37/0213B01J37/086B01J29/72B01J2229/18B01J35/56
Inventor 于力娜韩建张克金崔龙苏中辉
Owner CHINA FIRST AUTOMOBILE
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