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A kind of preparation method of monolithic molecular sieve SCR catalytic reactor

A catalytic reactor and molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, separation methods, etc., can solve the problems of rising overall cost of honeycomb catalysts, waste of catalytic active components, and inability to use active components, etc., to achieve Improved durability, cheap raw materials, and waste-free effects

Active Publication Date: 2019-12-31
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the honeycomb catalysts involved in the above two disclosed inventions, the catalytically active components are evenly distributed in each part of the honeycomb catalyst. In actual use, the active components inside the honeycomb catalyst cannot be utilized, which will inevitably lead to Increase in overall catalyst cost and waste of catalytically active components

Method used

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  • A kind of preparation method of monolithic molecular sieve SCR catalytic reactor
  • A kind of preparation method of monolithic molecular sieve SCR catalytic reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The honeycomb ceramic catalyst was prepared by using kaolin, ZSM-5 molecular sieve, mullite fiber and aluminum dihydrogen phosphate as raw materials.

[0021] The first step: preparation of honeycomb ceramic mud

[0022] 6.0kg kaolin, 0.4kgZSM-5 molecular sieve, 0.5kg mullite fiber, 1.5kg aluminum dihydrogen phosphate, 0.3kg methyl cellulose (binder), 0.3kg tung oil (lubricant), 0.3kg glycerin ( Plasticizer) and 2kg of water were put into a mud kneader and kneaded for 5 hours to make mud; then put the mud billet into a vacuum mud mill for mud refining, and the mixing time was 2 hours; Wrap it with a plastic wrap, put it into a cool and humid air and stale for 20 hours to make a mud base with good plasticity; put the aged mud base into an extruder for extrusion molding, and the extrusion pressure is 23Mpa to make the mud base The billet passes through a 200-mesh stainless steel mold with a diameter of 18 cm on the bottom surface, and then cuts it into a honeycomb cerami...

Embodiment 2

[0028] The honeycomb ceramic catalyst was prepared by using bentonite, SAPO-34 molecular sieve and mullite fiber as raw materials.

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

[0030]5.5kg kaolin, 1.7kg SAPO-34 molecular sieve, 0.3kg mullite fiber, 2.5kg aluminum dihydrogen phosphate, 0.4kg hydroxypropyl methylcellulose (binder), 0.3kg tung oil (lubricant), 0.3kg Glycerin (plasticizer) and 2.5kg of water are put into a mud kneader and kneaded for 5 hours to make mud; then the mud is put into a vacuum mud mill for 2 hours; The mud base of the mud is wrapped with a plastic wrap, put into a cool and humid air and stale for 20 hours to obtain a mud base with good plasticity; the aged mud base is put into an extruder for extrusion molding, and the extrusion pressure is 23Mpa, make the mud body pass through a stainless steel mold with a bottom diameter of 18cm and 200 meshes, and then cut it into a honeycomb ceramic wet body of the required length with a molybdenu...

Embodiment 3

[0036] Attapulgite, SSZ-13 molecular sieve and mullite fiber were used as raw materials to prepare honeycomb ceramic catalyst.

[0037] The first step: preparation of honeycomb ceramic mud

[0038] 6kg attapulgite, 0.8kgSSZ-13 molecular sieve, 0.2kg mullite fiber, 3.0kg aluminum dihydrogen phosphate, 0.3kg hydroxyethyl cellulose (binder), 0.3kg tung oil (lubricant), 0.3kg glycerin (Plasticizer) and 2.0kg of water were put into a mud kneader and kneaded for 5 hours to make mud; then the mud was put into a vacuum mud mill for mud refining, and the mixing time was 2 hours; Wrap the mud base with plastic wrap, put it into a cool and humid air and stale for 20 hours to make a mud base with good plasticity; put the aged mud base into an extruder for extrusion molding, and the extrusion pressure is 23Mpa , make the mud body pass through a stainless steel mold with a bottom diameter of 18cm and 200 mesh, and then cut it into a honeycomb ceramic wet body of the required length with a ...

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Abstract

The invention relates to a preparation method of an integral molecular sieve SCR catalytic reactor, which is characterized in that the preparation method is as follows: adding molecular sieve original powder and metal oxide powder to the raw materials for making ceramic honeycomb carriers to form an outer surface Ceramic honeycomb catalyst carrier with molecular sieve powder. The molecular sieve powder in the carrier is used as a seed crystal, and the catalyst is grown on the honeycomb carrier by a direct synthesis method to make an integral SCR catalytic reactor. The raw materials are cheap, the sintering temperature is low, and the preparation method is simple. The molecular sieve and clay are blended and extruded. After being extracted, the molecular sieve is evenly distributed in all parts of the honeycomb body and serves as a seed crystal in the subsequent reaction of supporting the catalyst, which shortens the reaction time and increases the reaction yield; the metal salt solution used can be reused, reducing production costs. ; At the same time, the metal oxides in the pores of the honeycomb catalyst can serve as sulfur poisoning active centers to improve the durability of the honeycomb catalyst.

Description

technical field [0001] The invention relates to a preparation method of an integral molecular sieve SCR catalytic reactor, which belongs to the field of diesel vehicle tail gas purification, and is especially used for the reduction of nitrogen oxides according to the selective catalytic reduction method, that is, the reduction of nitrogen oxides by using a nitrogen-containing reducing agent . Background technique [0002] Nitrogen oxides (NOx) are one of the main pollutants in the atmosphere, among which NO and NO2 account for the largest proportion. With the rapid development of my country's economy, the demand for energy is increasing day by day, and the emission of NOx is also increasing sharply. Diesel vehicles are one of the main emission sources of NOx, and the control of NOx emission has become a very concerned topic in environmental protection. For diesel vehicle NOx emissions, the emission regulations of countries around the world are becoming increasingly stringe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/46B01J29/72B01J29/85B01J35/04B01D53/94B01D53/56
CPCB01D53/9418B01J29/46B01J29/723B01J29/85B01J2229/20B01J35/56
Inventor 张斌崔龙韩建于力娜王金兴姜涛陈慧明张克金
Owner CHINA FIRST AUTOMOBILE
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