Preparation method of CHA molecular sieve SCR monolithic catalyst

A monolithic catalyst and molecular sieve technology, which is applied in molecular sieve catalysts, catalyst activation/preparation, chemical instruments and methods, etc., can solve problems such as coating failure, hole plugging and slurry hanging, slurry viscosity is difficult to control, etc., to improve silicon aluminum Ratio, increase the stability of the slurry, and the effect of easy control of the viscosity of the slurry

Inactive Publication Date: 2017-01-04
WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One is that the slurry viscosity is not easy to control during the catalyst slurry preparation process
Second, when the CHA small-pore molecular sieve slurry is coated, it is very easy to cause hole blocking and slurry hanging, which leads to coating failure

Method used

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  • Preparation method of CHA molecular sieve SCR monolithic catalyst
  • Preparation method of CHA molecular sieve SCR monolithic catalyst
  • Preparation method of CHA molecular sieve SCR monolithic catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: A preparation method of CHA molecular sieve SCR monolithic catalyst includes the following steps:

[0032] (1) Preparation of Cu-SSZ-13 molecular sieve aqueous solution:

[0033] a. Prepare the Cu-SSZ-13 molecular sieve aqueous solution with a mass fraction of 45%;

[0034] b. Stir until the Cu-SSZ-13 molecular sieve is basically dissolved and ball milled to a particle size of 1.5μm;

[0035] (2) Preparation of adhesive:

[0036] a. Prepare a boehmite aqueous solution with a mass fraction of 8% and add HNO 3 Adjust the pH value of the aqueous solution to 3, in a constant temperature water bath at 90°C for 2 hours, and age for 3 days to obtain Al sol;

[0037] b. Prepare an aqueous solution of ultrafine nano-silica powder with a mass fraction of 30% and add HNO 3 Adjust the pH value of the aqueous solution to 2, 65°C constant temperature water bath for 2 hours, aging for 2 days to obtain Si sol;

[0038] c. According to the molar ratio of Si 4+ :Al 3+ =3, mix Al sol and S...

Embodiment 2

[0058] Embodiment 2: A preparation method of CHA molecular sieve SCR monolithic catalyst includes the following steps:

[0059] (1) Preparation of Cu-SSZ-13 molecular sieve aqueous solution:

[0060] a. Prepare an aqueous solution of Cu-SSZ-13 molecular sieve with a mass fraction of 47%;

[0061] b. Stir until the Cu-SSZ-13 molecular sieve is basically dissolved and ball milled to a particle size of 7.5μm;

[0062] (2) Preparation of adhesive:

[0063] a. Prepare boehmite aqueous solution with mass fraction of 5% and add HNO 3 Adjust the pH value of the aqueous solution to 5, in a constant temperature water bath at 90°C for 2 hours, and age for 3 days to obtain Al sol;

[0064] b. Prepare an aqueous solution of ultrafine nano-silica powder with a mass fraction of 30% and add HNO 3 Adjust the pH value of the aqueous solution to 2, a constant temperature water bath at 75°C for 2 hours, and age for 2 days to obtain Si sol;

[0065] c. According to the molar ratio of Si 4+ :Al 3+ =4, mix Al s...

Embodiment 3

[0072] Embodiment 3: A preparation method of CHA molecular sieve SCR monolithic catalyst includes the following steps:

[0073] (1) Preparation of Cu-SAPO-34 molecular sieve aqueous solution:

[0074] a. Prepare an aqueous solution of Cu-SAPO-34 molecular sieve with a mass fraction of 55%;

[0075] b. Stir until the Cu-SAPO-34 molecular sieve is basically dissolved and ball milled to a particle size of 8.5μm;

[0076] (2) Preparation of adhesive:

[0077] a. Prepare boehmite aqueous solution with mass fraction of 6% and add HNO 3 Adjust the pH value of the aqueous solution to 5, in a constant temperature water bath at 90°C for 3 hours, and age for 5 days to obtain Al sol;

[0078] b. Prepare an aqueous solution of ultrafine nano-silica powder with a mass fraction of 25% and add HNO 3 Adjust the pH value of the aqueous solution to 2, in a constant temperature water bath at 75°C for 3 hours, and age for 5 days to obtain Si sol;

[0079] c. According to the molar ratio of Si 4+ :Al 3+ =4, mi...

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Abstract

The invention relates to a preparation method of a CHA molecular sieve SCR monolithic catalyst. The preparation method is characterized by comprising the following steps of 1 CHA molecular sieve aqueous solution preparing; 2 adhesive preparing, wherein Al sol and Si Sol are prepared, mixed and stirred to be uniform at uniform velocity, and then the mixture is aged for 1-3 h to obtain an adhesive; 3 viscosity controlling, wherein the CHA molecular sieve aqueous solution and the adhesive are mixed to prepare molecular sieve coating size with the needed solid content, the molecular sieve coating size is stirred for 1-3 h, the viscosity of the molecular sieve coating size is tested and regulated to be 100-1,000 cP by regulating the pH value; 4 carrier coating, wherein after carrier coating is conducted, the surplus molecular sieve coating size is blown out, dried and then calcined for 2-3 h after the temperature is increased to 500 DEG C to 650 DEG C at the temperature increasing speed of 3-5 DEG C/min. According to the preparation method, a preparation technology of the CHA molecular sieve monolithic catalyst is greatly simplified, the size stability is improved, the size viscosity is easily controlled, and therefore the size can adapt to multiple coating processes.

Description

Technical field [0001] The invention relates to a preparation method of a CHA molecular sieve SCR monolithic catalyst, which belongs to the technical field of catalyst preparation. Background technique [0002] NH 3 Selective catalytic reduction of NO x (NH 3 -Selective Catalytic Reduction) is currently recognized as the most effective diesel vehicle exhaust NO x One of the purification technologies, the development of efficient, stable and environmentally friendly NH 3 -SCR catalyst is currently the common goal of automotive exhaust gas aftertreatment companies and major research institutions. Due to the Chabazite (CHA) structure of the copper-based small pore molecular sieve catalyst has excellent catalytic activity, high hydrothermal stability, resistance to hydrocarbons (HC s ) The advantages of good poisoning ability, CHA monolithic catalyst has the characteristics of wide catalytic window, high high temperature activity, high thermal stability, etc. It is widely regarded as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J29/85
CPCB01J29/763B01J29/85B01J37/0018B01J37/0228
Inventor 金炜阳任衍伦施文杰岳军贾莉伟
Owner WUXI WEIFU ENVIRONMENT PROTECTION CATALYST
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