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Preparation method of coating slurry and preparation method of coating type cu molecular sieve scr catalyst

A technology of SCR catalyst and molecular sieve, which is applied in the field of diesel engine exhaust purification catalyst, can solve the problems of low adhesion, low temperature window, toxicity, etc., and achieve the effect of good coating strength, simple process and good firmness

Active Publication Date: 2020-11-24
CHINA AUTOMOTIVE TECH & RES CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention aims to propose a method for preparing a coating slurry and a method for preparing a coating-type Cu molecular sieve SCR catalyst, so as to solve the problems of existing catalysts such as low temperature window, toxicity and low adhesion.

Method used

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  • Preparation method of coating slurry and preparation method of coating type cu molecular sieve scr catalyst
  • Preparation method of coating slurry and preparation method of coating type cu molecular sieve scr catalyst
  • Preparation method of coating slurry and preparation method of coating type cu molecular sieve scr catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Dissolve 0.77g of copper nitrate in 20g of deionized water, stir and dissolve fully to form a blue transparent solution, then add 6.8g of SAPO-34 powder and 4.82g of acidic silica sol in sequence, the pH is 4, stir for 6h to form a stable slurry. Cut the cordierite honeycomb ceramics into a cross-section of 12mm*12mm~15mm*15mm, and a length of 18~25mm, weigh them, and then immerse them in the slurry under ultrasonic conditions for 5 minutes, take them out and purge the pores, dry them at 120°C for 4 hours, take them out Then immerse in the slurry, repeat 3 times, and finally put it into a muffle furnace for calcination at 550°C for 5 hours to obtain the desired coated catalyst and weigh it. The prepared coated catalyst was ultrasonically treated for 30 minutes, then dried in a drying oven at 120°C for 4 hours, then calcined in a muffle furnace at 550°C for 5 hours, and weighed. The results are shown in Table 1.

[0056] The schematic diagram of the prepared catalyst st...

Embodiment 2

[0058] Dissolve 0.77g of copper nitrate in 20g of deionized water, stir and dissolve fully to form a blue transparent solution, then add 6.2g of SAPO-34 powder and 7.65g of acidic silica sol in sequence, the pH is 4, stir for 6h to form a stable slurry. Cut the cordierite honeycomb ceramics into a cross-section of 12mm*12mm~15mm*15mm, and a length of 18~25mm, weigh them, and then immerse them in the slurry under ultrasonic conditions for 5 minutes, take them out and purge the pores, dry them at 120°C for 4 hours, take them out Then immerse in the slurry, repeat 3 times, and finally put it into a muffle furnace for calcination at 550°C for 5 hours to obtain the desired coated catalyst and weigh it. The prepared coated catalyst was ultrasonically treated for 30 minutes, then dried in a drying oven at 120°C for 4 hours, then calcined in a muffle furnace at 550°C for 5 hours, and weighed. The results are shown in Table 1.

Embodiment 3

[0060] Dissolve 0.77g of copper nitrate in 20g of deionized water, stir and dissolve fully to form a blue transparent solution, then add 7.9g of SAPO-34 powder and 1.98g of acidic silica sol in sequence, the pH is 4, stir for 6h to form a stable slurry. Cut the cordierite honeycomb ceramics into a cross-section of 12mm*12mm~15mm*15mm, and a length of 18~25mm, weigh them, and then immerse them in the slurry under ultrasonic conditions for 5 minutes, take them out and purge the pores, dry them at 120°C for 4 hours, take them out Then immerse in the slurry, repeat 3 times, and finally put it into a muffle furnace for calcination at 550°C for 5 hours to obtain the desired coated catalyst and weigh it. The prepared coated catalyst was ultrasonically treated for 30 minutes, then dried in a drying oven at 120°C for 4 hours, then calcined in a muffle furnace at 550°C for 5 hours, and weighed. The results are shown in Table 1.

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Abstract

The invention provides a method for preparing a coating slurry and a method for preparing a coating-type Cu molecular sieve SCR catalyst. The Cu precursor is directly added to the slurry, and the active component Cu is simultaneously loaded on the surface of the molecular sieve and the binder. There are still active components on the surface of the catalyst after the catalyst has fallen off; this method greatly reduces the time and preparation process for Cu to be loaded on the molecular sieve, and simplifies the preparation process; the present invention reduces the preparation process, greatly reduces energy consumption, and does not need to be added Dispersant, the prepared catalyst has good coating strength and good NH3‑SCR performance, and active components remain after the catalyst falls off.

Description

technical field [0001] The invention belongs to the field of diesel engine tail gas purification catalysts, and in particular relates to a preparation method of a coating slurry and a preparation method of a coating type Cu molecular sieve SCR catalyst. Background technique [0002] With the increase of the number of automobiles in China, the contribution rate of pollutants in automobile exhaust to my country's air pollution continues to increase. The NOx emission of diesel engines is more serious than that of gasoline engines. The treatment of diesel engine exhaust has become one of the problems that need to be solved urgently. Urea-selective catalytic reduction technology (Urea-selective catalytic reduction, Urea-SCR) is one of the most effective ways to solve the NOx pollution of diesel engines. 2 o 5 -WO 3 -TiO 2 System-based, mainly coating the prepared V-based catalyst on the surface of cordierite honeycomb ceramics by adding a certain binder. This catalyst has matu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/85B01J29/76B01J35/04B01D53/94B01D53/56
CPCB01D53/9418B01J29/76B01J29/85B01J2229/186B01J35/56
Inventor 李振国吴撼明任晓宁李凯祥高继东刘双喜邵元凯钟祥麟
Owner CHINA AUTOMOTIVE TECH & RES CENT
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