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Preparation method of molecular sieve coating slurry for integral catalyst

A molecular sieve and coating slurry technology, applied in chemical instruments and methods, molecular sieve catalysts, physical/chemical process catalysts, etc., can solve the problems of easy plugging, fast sedimentation of molecular sieve catalyst slurry, unstable viscosity, etc.

Active Publication Date: 2021-05-18
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of the existing molecular sieve catalyst slurry such as fast sedimentation, unstable viscosity, easy plugging, and low adhesion, the present invention provides a method for preparing molecular sieve coating slurry for monolithic catalytic converters

Method used

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  • Preparation method of molecular sieve coating slurry for integral catalyst
  • Preparation method of molecular sieve coating slurry for integral catalyst

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Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of a stable molecular sieve coating slurry, comprising the following steps:

[0030] Adjust the pH of 174g of deionized water to 3.5, add the water into the planetary mill, then add a mixture of 34.8g of aluminum sol dry powder and 126g of Cu-type SSZ-13 (D90 is 8μm) molecular sieve, add 630g of zirconium balls, stir well and use planetary Grind and disperse for 15 minutes at a speed of 300 rpm. After discharge, the slurry was left to age for 2 hours to form a stable slurry, which was characterized by Zeta point. The results are shown in Table 1.

[0031] The Zeta potential value of the coating slurry obtained by this method is 32.09mV, that is, it has reached a stable state. The higher the Zeta potential value, the more stable the dispersion system is. Usually, for slurry, when the potential value reaches 30mV, it can be considered to have reached a stable state.

Embodiment 2

[0033] A preparation method of a stable molecular sieve coating slurry, comprising the following steps:

[0034]Adjust the pH to 3.5 with 174g of deionized water, add the water into the planetary mill, then add 34.8g of aluminum sol dry powder and 126g of Cu-type SSZ-13 (D90 is 5μm) molecular sieve mixture, add 630g of zirconium balls, stir well and use planetary mill Disperse for 15 minutes at a speed of 300 rpm. After discharge, the slurry was left to age for 1 hour to form a stable slurry, which was characterized by Zeta point, and the results are shown in Table 1.

Embodiment 3

[0036] A preparation method of a stable molecular sieve coating slurry, comprising the following steps:

[0037] Adjust the pH of 174g of ionized water to 3.5, add the water into the planetary mill, then add 34.8g of aluminum sol dry powder and 126g of Cu type SSZ-39 (D90 is 8μm) molecular sieve mixture, add 630g of zirconium balls, stir well and disperse with planetary mill 15min, the rotation speed is 300rpm. After discharge, the slurry was left to age for 1 hour to form a stable slurry, which was characterized by Zeta point, and the results are shown in Table 1.

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Abstract

The invention provides a preparation method of a molecular sieve coating slurry for a monolithic catalyst, which comprises the following steps: mixing a molecular sieve with alumina sol dry powder, adding the mixture into water of which the pH value is adjusted in advance, carrying out ball milling dispersion, and aging the discharged slurry to form a stable and uniform mixed solution, namely the coating slurry. Compared with the traditional liquid sol, the Zeta potential value of the coating slurry obtained by the preparation method disclosed by the invention is obviously increased and can be increased from 17.65 mv to 35.37 mv, so that the problems that the molecular sieve slurry is unstable and easy to settle are thoroughly solved. The coating prepared by the method has good stability and good coating strength, wherein the one-time coating load rate can reach 36.45%, and the shedding rate can reach 2.87% or below. The coating slurry provided by the invention still does not settle after being kept for 6 months at most, so that the difficulty of a coating process is greatly reduced, and the slurry does not influence the conversion efficiency of NOx.

Description

technical field [0001] The invention relates to the field of catalytic materials, in particular to a method for preparing a molecular sieve coating slurry for an integral catalytic converter. 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 diesel engine NOx pollution. The core of this technology lies in the research of catalysts. In recent years, honeycomb carrier catalysts loaded with molecular sieve components have begun to be applied in the fields of industrial catalysis and environmental catalysis. This catal...

Claims

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Application Information

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IPC IPC(8): B01J29/76B01J35/10
CPCB01J29/76B01J35/617B01J35/633B01J35/647Y02T10/12
Inventor 宋锡滨崔自强焦英训王军赵莎鞠云忠崔树芝
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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