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Cu-CHA and H-AEI composite catalyst and preparation method and application thereof

A composite catalyst, SCR catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex preparation methods, poor hydrothermal stability, and high preparation costs, and achieve simple preparation methods. The effect of strong thermal stability and low preparation cost

Pending Publication Date: 2022-07-12
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The currently disclosed ammonia selective catalytic reduction catalysts have certain defects, such as low catalytic activity at low temperatures, poor hydrothermal stability, complex preparation methods and high preparation costs.

Method used

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  • Cu-CHA and H-AEI composite catalyst and preparation method and application thereof
  • Cu-CHA and H-AEI composite catalyst and preparation method and application thereof
  • Cu-CHA and H-AEI composite catalyst and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0054] This embodiment provides a composite catalyst of Cu-CHA and H-AEI, and the composite catalyst comprises Cu-CHA zeolite with a mass ratio of 27:3 and SSZ-39 hydrogen zeolite with AEI structure type (H-AEI zeolite).

[0055] The preparation method of the composite zeolite SCR catalyst comprises:

[0056] The composite catalyst is obtained by grinding and mixing Cu-CHA zeolite and H-AEI zeolite;

[0057] Based on the mass of Cu-CHA zeolite, the mass fraction of Cu in the Cu-CHA zeolite is 4.2%, and the molar ratio of silica to alumina is 9:1; The molar ratio of alumina was 20:1.

[0058] The preparation method of the Cu-CHA zeolite comprises the following steps:

[0059] (1) Stir and mix the SSZ-13 hydrogen-type zeolite with a structure type of CHA and an ammonium chloride solution with a concentration of 0.2 mol / L at a speed of 500 rpm at 30 °C, and the solid state of the SSZ-13 hydrogen-type zeolite and the ammonium chloride solution. The liquid ratio is 1:20, and th...

Embodiment 2

[0062] This embodiment provides a composite catalyst of Cu-CHA and H-AEI, and the composite catalyst comprises Cu-CHA zeolite with a mass ratio of 60:3 and SSZ-39 hydrogen zeolite with AEI structure type (H-AEI zeolite).

[0063] The preparation method of the composite zeolite SCR catalyst comprises:

[0064] The composite catalyst is obtained by grinding and mixing Cu-CHA zeolite and H-AEI zeolite;

[0065] Based on the mass of Cu-CHA zeolite, the mass fraction of Cu in the Cu-CHA zeolite is 2.4%, and the molar ratio of silica to alumina is 20:1; The molar ratio of alumina was 25:1.

[0066] The preparation method of the Cu-CHA zeolite comprises the following steps:

[0067] (1) Stir and mix the SSZ-13 hydrogen-type zeolite with a structure type of CHA and an ammonium chloride solution with a concentration of 0.18 mol / L at a speed of 600 rpm at 50 °C, and the solid state of the SSZ-13 hydrogen-type zeolite and the ammonium chloride solution. The liquid ratio is 1:25, and th...

Embodiment 3

[0070] This embodiment provides a composite catalyst of Cu-CHA and H-AEI, the composite catalyst comprises Cu-CHA zeolite with a mass ratio of 7:3 and SSZ-39 hydrogen zeolite with AEI structure type (H-AEI zeolite).

[0071] The preparation method of the composite zeolite SCR catalyst comprises:

[0072] The composite catalyst is obtained by grinding and mixing Cu-CHA zeolite and H-AEI zeolite;

[0073] Based on the mass of Cu-CHA zeolite, the mass fraction of Cu in the Cu-CHA zeolite is 5.6%, and the molar ratio of silica to alumina is 12:1; The molar ratio of alumina was 40:1.

[0074] The preparation method of the Cu-CHA zeolite comprises the following steps:

[0075] (1) Stir and mix the SSZ-13 hydrogen-type zeolite with a structure type of CHA and an ammonium chloride solution with a concentration of 0.13 mol / L at a speed of 400 rpm at 40 °C, and the solid state of the SSZ-13 hydrogen-type zeolite and the ammonium chloride solution. The liquid ratio is 1:30, and the u...

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Abstract

The invention provides a composite catalyst of Cu-CHA and H-AEI as well as a preparation method and application of the composite catalyst. The composite catalyst comprises Cu-CHA zeolite and H-AEI zeolite, the NOx purification efficiency of the composite catalyst under the condition of not less than 250 DEG C is not less than 85%; the composite catalyst is subjected to hydrothermal aging treatment for 10-120 hours at the temperature of 650-850 DEG C, and the purification efficiency of the composite zeolite SCR catalyst subjected to hydrothermal aging treatment on NOx is larger than or equal to 70% at the temperature larger than or equal to 250 DEG C. The Cu-CHA and H-AEI composite catalyst disclosed by the invention has the advantages of relatively strong catalytic activity, relatively strong hydrothermal stability, simple preparation method and low preparation cost, and the Cu-CHA and H-AEI composite catalyst is an efficient and stable NH3-SCR (Selective Catalytic Reduction) catalyst.

Description

technical field [0001] The invention belongs to the technical field of industrial waste gas treatment and environmental protection catalytic materials, and relates to a composite catalyst of Cu-CHA and H-AEI, in particular to a composite catalyst of Cu-CHA and H-AEI, and a preparation method and application thereof. Background technique [0002] For a long time, diesel vehicles, especially heavy-duty diesel vehicles, have been the main force in the long-distance freight market. The high-frequency and long-distance operation of diesel vehicles, especially diesel trucks, leads to their main pollutants, nitrogen oxides (NO). x ) emissions are large, and have become atmospheric haze (PM2.5), ozone (O 3 ) is an important cause of pollution. Selective catalytic reduction of ammonia (NH 3 -SCR) is to purify diesel exhaust NO x The most efficient and widely used technology of the 3 -Development of SCR catalysts. Due to particulate matter (PM) and NO x Coordinated control is r...

Claims

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Application Information

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IPC IPC(8): B01J29/80B01D53/94B01D53/56
CPCB01J29/80B01D53/9413B01D53/9427B01J29/763B01J29/70B01D2251/2062B01J2229/18Y02T10/12Y02A50/20
Inventor 贺泓单玉龙陈俊林石晓燕余运波
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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