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Two-step method 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., can solve the problems of low conversion rate, complicated preparation process, high light-off temperature, etc., achieve low temperature and high NOx activity, overcome Effects of coating peeling and high-efficiency loading

Active Publication Date: 2017-12-29
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 temperature NO x The conversion rate is low; (4) The preparation process is complicated

Method used

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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

[0023] The first step: preparation of honeycomb ceramic body

[0024] 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

[0028] The first step: preparation of honeycomb ceramic body

[0029] 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 method honeycomb catalyst and a preparation method thereof. The preparation method is characterized by comprising the following steps: I, preparing a blank from clay, a molecular sieve, a mullite fiber, cellulose, a high-temperature adhesive, a lubricant, a plasticizer and water, and performing drying, molding and calcining so as to obtain a honeycomb ceramic; and II, soaking the honeycomb ceramic into a mixed solution of copper ions, transition metal ions and ammonium carbamate at certain temperature, and performing drying and calcining treatment, thereby obtaining the honeycomb catalyst. The honeycomb catalyst provided by the invention has the advantages of low combustion start temperature, uniform active component distribution and low coating dropping rate; the conversion rate of NOx within a temperature range of 185-460 DEG C is greater than 75%, and relatively good low-temperature NOx activity is achieved. In addition, the preparation method is simple in process 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] 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 NOx is quickly reduced by ammonia gas to nitrogen and water, ammonia and NO when passing over the active coated carrier 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 secondly provides a suitable cataly...

Claims

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Application Information

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Patent Type & Authority Applications(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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