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Extruded molecular sieve honeycomb catalyst and preparation method thereof

A honeycomb catalyst and molecular sieve technology, applied in molecular sieve catalysts, catalyst activation/preparation, chemical instruments and methods, etc., can solve the problems of easy coating peeling, complicated preparation process and improvement, achieve good De-NOx activity, overcome coating problems, etc. Layer shedding, high efficiency load 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-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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  • Extruded molecular sieve honeycomb catalyst and preparation method thereof
  • Extruded molecular sieve honeycomb catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The first step: the preparation of mud

[0018] Put 5.5kg of kaolin, 2.0kg Beta25 molecular sieve, 0.5kg of mullite fiber, 2.0kg of aluminum dihydrogen phosphate, 0.3kg of methylcellulose, 0.3kg of tung oil, 0.3kg of glycerin and 2kg of water into a kneader for 4h. Mud; put the mud in a vacuum mud mixer for smelting, and the mixing time is 4h; after that, wrap the mud after vacuum smelting with plastic wrap and put it in a cool and humid air for 20 hours to age. Get good plasticity;

[0019] Step 2: Setting the honeycomb ceramic body

[0020] Put the stale mud blank into the extruder for extrusion molding, the extrusion pressure is 23Mpa, the mud blank is passed through a stainless steel mold with a bottom diameter of 18cm and 200 mesh, and then cut into the required length of honeycomb ceramic wet with molybdenum wire Green body: After the green body is extruded, it is quickly put into the microwave for drying and shaping, the drying temperature is 105℃, until it is dry, th...

Embodiment 2

[0026] The first step: the 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 kneader After mixing for 8 hours into mud; then put the mud in a vacuum mud mixer for mixing, and the mixing time is 1 hour; then wrap the mud after vacuum mud mixing with plastic wrap and put it in cool and humid air It is aged for 24 hours, and the plastic body is prepared;

[0028] Step 2: Setting the honeycomb ceramic body

[0029] Put the stale mud blank into the extruder for extrusion molding, the extrusion pressure is 23Mpa, the mud blank is passed through a stainless steel mold with a bottom diameter of 18cm and 200 mesh, and then cut into the required length of honeycomb ceramic wet with molybdenum wire Green body: After being extruded, the green body is quickly placed in a microwave at 105°C for drying and setting, until it dries out, the...

Embodiment 3

[0033] The first step: the 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 kneader Mix the mud for 4h; then put the mud in a vacuum mud mixer for mud refining for 2h; then wrap the mud after vacuum mud refining with plastic wrap and put it in a cool and humid air for 20 hours to aging to obtain plasticity Good mud

[0035] Step 2: Setting the honeycomb ceramic body

[0036] Put the stale mud blank into the extruder for extrusion molding, the extrusion pressure is 23Mpa, the mud blank is passed through a stainless steel mold with a bottom diameter of 18cm and 200 mesh, and then cut into the required length of honeycomb ceramic wet with molybdenum wire Green body: After the green body is extruded, it is quickly placed in the microwave at 110°C for drying and shaping, until it is dry, the end surface is processed; 580°C, sintered f...

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Abstract

The invention relates to an extruded molecular sieve honeycomb catalyst and a preparation method thereof, which is characterized in that the prepared honeycomb ceramic body is immersed in a mixed liquid containing copper ions, iron ions, transition metal ions and ammonium carbamate at a certain temperature. , causing the metal ions in the active liquid to react with some active sites of the molecular sieve in the honeycomb ceramic body, and then burning at high temperature under the action of ammonium carbamate to fully react with the remaining active sites of the molecular sieve and the multi-component metal ions to achieve activity on the surface of the carrier Uniform distribution of components and high efficiency loading; it has the advantages of uniform loading of active components and low coating shedding rate. The conversion rate of NOx is higher than 75% in the temperature range of 215~520℃, showing that under a wide temperature window Better De‑NOx effect. The preparation method of the invention is simple and easy to control the 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 preparation of SCR denitration catalysts. Background technique [0002] In order to meet NOx emission regulations, in-flight purification and after-treatment technologies are indispensable. At present, SCR technology has become the first choice for medium and heavy diesel engine companies to reduce NOx. The principle is to use ammonia produced by urea hydrolysis and NOx in automobile exhaust. When the carrier is coated with an active coating, NOx is quickly reduced by ammonia to nitrogen and water. The reason why ammonia and NOx can undergo rapid chemical reactions on the post-treatment carrier is inseparable from the composition of the carrier. The carrier is responsible for the coating and active components, and secondly, it also provides suitable catalytic reacti...

Claims

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Application Information

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Patent Type & Authority Patents(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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