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A kind of cha/aei composite denitration catalyst and its preparation method and application

A denitration catalyst and catalyst technology, applied in the direction of physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of poor stability, low-temperature catalytic activity of catalysts, etc., and achieve low-temperature catalytic effects. Excellent high hydrothermal stability and low temperature denitrification activity, easy to operate

Active Publication Date: 2021-12-28
SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a CHA / AEI composite denitration catalyst, which simply and efficiently solves the problem of low-temperature catalytic activity or poor stability of existing catalysts, so that it has good performance in the denitration process

Method used

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  • A kind of cha/aei composite denitration catalyst and its preparation method and application

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Effect test

Embodiment 1

[0028] A CHA / AEI composite denitration catalyst, the carrier of which is a composite formed of SSZ-13 molecular sieve and SSZ-39 molecular sieve, and the active component of the catalyst is copper. SSZ-13 Molecular Sieve SiO 2 / Al 2 o 3 SiO ratio of 31, SSZ-39 molecular sieve 2 / Al 2 o 3 The ratio is 15, and the mass ratio of SSZ-13 molecular sieve to SSZ-39 molecular sieve is 1:1; the copper loading of the catalyst is 4.0wt%.

[0029] This embodiment also provides the preparation method of the CHA / AEI composite denitration catalyst, including:

[0030] 1) Preparation of composite molecular sieve: weigh SiO 2 / Al 2 o 3 15g of SSZ-13 molecular sieve with a ratio of 31 and SiO 2 / Al 2 o 3 Take 15g of SSZ-39 molecular sieve with a ratio of 15, move the two kinds of molecular sieves into volumetric flasks respectively, add 150g of deionized water, stir for 1 hour, then filter with suction, and dry the filter cake at 120°C for 12 hours.

[0031] 2) Preparation of copper...

Embodiment 2

[0033] A CHA / AEI composite denitration catalyst, the carrier of which is a composite formed of SSZ-13 molecular sieve and SSZ-39 molecular sieve, and the active component of the catalyst is copper. SSZ-13 Molecular Sieve SiO 2 / Al 2 o 3 SiO ratio of 25, SSZ-39 molecular sieve 2 / Al 2 o 3 The ratio is 25, and the mass ratio of SSZ-13 molecular sieve to SSZ-39 molecular sieve is 1:1; the copper loading of the catalyst is 4.0wt%.

[0034] The preparation method refers to Example 1 (only the raw materials are different).

Embodiment 3

[0036] A CHA / AEI composite denitration catalyst, the carrier of which is a composite formed of SSZ-13 molecular sieve and SSZ-39 molecular sieve, and the active component of the catalyst is copper. SSZ-13 Molecular Sieve SiO 2 / Al 2 o 3 SiO ratio of 31, SSZ-39 molecular sieve 2 / Al 2 o 3 The ratio is 15, and the mass ratio of SSZ-13 molecular sieve to SSZ-39 molecular sieve is 1:5; the copper loading of the catalyst is 4.0wt%.

[0037] The preparation method refers to Example 1 (only the raw materials are different).

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Abstract

The invention relates to a CHA / AEI composite denitration catalyst, a preparation method and application thereof. The carrier of the composite denitration catalyst is a compound formed by SSZ-13 molecular sieve and SSZ-39 molecular sieve, and the active component is copper. The present invention found that the CHA / AEI composite denitration catalyst prepared by mixing SSZ-13 molecular sieve with a specific silicon-aluminum ratio and SSZ-39 molecular sieve with a specific silicon-aluminum ratio in a specific ratio, and then loading the active component copper, has excellent Catalytic activity is significantly better than catalysts made of SSZ-13 molecular sieve and SSZ-39 molecular sieve alone; especially, the composite denitration catalyst has high high-temperature activity and ideal low-temperature activity, as well as better stability.

Description

technical field [0001] The invention relates to the technical field of molecular sieve catalysts, in particular to a CHA / AEI composite denitration catalyst and its preparation method and application. Background technique [0002] With the international regulation of nitrogen oxides (NO x ) emission requirements are becoming more and more stringent, and it is the general trend to use molecular sieves with high activity and high hydrothermal stability as the carrier for denitrification of automobile exhaust. At present, the molecular sieves commonly used in the denitrification of automobile exhaust include ZSM-5, FAU, β molecular sieve, MOR, SAPO-34, SSA-13, SSZ-39, AlO4-18, etc. The active components loaded are mainly copper, iron, manganese, cerium and so on. At present, the catalyst with better denitrification effect is Cu-SSZ-13 catalyst or Fe-SSZ-13 catalyst. Both catalysts have their pros and cons. Cu-SSZ-13 catalyst has good low-temperature catalytic activity, but i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80B01D53/94B01D53/56
Inventor 宋锡滨穆岩岩艾辽东潘光军焦英训
Owner SHANDONG SINOCERA FUNCTIONAL MATERIAL CO LTD