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Two-step honeycomb catalyst preparation method

A technology of honeycomb catalyst and step method, which is applied in the direction of catalyst activation/preparation, molecular sieve catalyst, chemical instruments and methods, etc. It can solve the problems of high light-off temperature, complicated preparation process, low NOx conversion rate, etc., and achieve high NOx activity at low temperature , Overcoming coating shedding and low ignition temperature

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) The internal active components cannot be utilized, resulting in waste of catalytic active components and high production costs; (2) The catalyst temperature window is narrow; (3) The light-off temperature is high , low NOx conversion rate at low temperature; (4) The preparation process is complex

Method used

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  • Two-step honeycomb catalyst preparation method
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Examples

Experimental program
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Effect test

Embodiment 1

[0015] The first step: preparation of honeycomb ceramic body

[0016] Put 5.5kg kaolin, 2.0kg Beta25 molecular sieve, 0.5kg mullite fiber, 2.0kg aluminum dihydrogen phosphate, 0.3kg methylcellulose, 0.3kg tung oil, 0.3kg glycerin and 2kg water into the kneader and knead for 3 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 and stale for 18 hours, and make Obtain the mud base with good plasticity; Put the stale mud base into the extruder and carry out extrusion molding, the extrusion pressure is 23Mpa, make the mud base pass through the bottom surface diameter to be 18cm, 200 mesh stainless steel molds, then cut into For the honeycomb ceramic wet body of the required length, quickly put the green body into the microwave for drying and shaping. The drying temperature is 105°C until it is completely dry. Th...

Embodiment 2

[0024] The first step: preparation of honeycomb ceramic body

[0025] 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,...

Embodiment 3

[0029] The first step: preparation of honeycomb ceramic body

[0030] 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 For a good mud billet, put the stale mud billet into the extruder for extrusion molding. The extrusion pressure is 23Mpa, so that the mud billet passes through a stainless steel mold with a bottom diameter of 18cm and 200 meshes, and then cuts it into the desired shape with a molybdenum wire. The length of 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 proce...

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Abstract

The invention relates to a two-step honeycomb catalyst and its preparation method, which is characterized in that in the first step, clay, molecular sieves, mullite fibers, cellulose, high-temperature binders, lubricants, plasticizers and water are made into mud. The green body is dried, shaped, and calcined to obtain a honeycomb ceramic body; in the second step, the honeycomb ceramic body is immersed in a mixture containing copper ions, transition metal ions, and ammonium carbamate at a certain temperature, and is dried and calcined to obtain a honeycomb shape. catalyst. The honeycomb catalyst prepared by the present invention has the advantages of low ignition temperature, uniform distribution of active components, and low coating shedding rate. In the temperature range of 185 to 460°C, the conversion rate of NOx is higher than 75%, showing better low-temperature performance. NOx activity. At the same time, the preparation process of the present invention is simple and easy to control.

Description

technical field [0001] The invention relates to a preparation method of a two-step honeycomb catalyst, which 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 the NOx emission regulations, internal purification and post-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 to use ammonia produced by urea hydrolysis and NOx in automobile exhaust to When the carrier coated with active coating, NOx is quickly reduced to nitrogen and water by ammonia gas. The reason why ammonia and NOx can undergo rapid chemical reaction on the post-treatment carrier is inseparable from the composition of the carrier. The carrier bears the coating and active components, and secondly provides a suitable catalytic reaction channel. How to c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/76B01J29/85B01J29/78B01J29/46B01J29/80B01J35/04B01J37/02B01J37/08
CPCB01J29/46B01J29/76B01J29/78B01J29/80B01J29/85B01J37/0018B01J37/024B01J37/08B01J35/56
Inventor 于力娜韩建张克金崔龙张斌杨帅苏中辉
Owner CHINA FIRST AUTOMOBILE
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