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AEI/AFX structure symbiotic composite molecular sieve as well as preparation method and SCR application thereof

A composite molecular sieve, molecular sieve technology, applied in separation methods, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as low activity

Inactive Publication Date: 2020-04-14
CHINA CATALYST HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defect that the SCR catalyst using a synthetic molecular sieve loaded with iron and copper in the prior art has low activity at low temperature after the hydrothermal durability test, and to provide a Copper-based SCR catalyst with high activity at low temperature and preparation method thereof

Method used

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  • AEI/AFX structure symbiotic composite molecular sieve as well as preparation method and SCR application thereof
  • AEI/AFX structure symbiotic composite molecular sieve as well as preparation method and SCR application thereof
  • AEI/AFX structure symbiotic composite molecular sieve as well as preparation method and SCR application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A preparation method of SSZ-39 / SSZ-16 symbiotic composite silica-alumina molecular sieve and SCR catalyst:

[0071] 1) 13.86g HY (nSiO2 / nAl2O3=5.2, dry basis 78wt%) molecular sieve and 179.04g deionized water are ultrasonically stirred to form a solution, then add 25.29g water glass (Na 2 O: 7.48wt%, SiO 2 : 24.61wt%), 18.34g silica gel solution (Na 2 O: 0.23wt%, SiO 2 : 29.49wt%), 16.05g 1,1,2,2,6,6-hexamethylpiperidinium quaternary ammonium base (weight concentration 25wt%, denoted as R1), 4.31g1,4-bis([4- Azepine-1-azonium bicyclo[2.2.2])butane (purity 99wt%, denoted as R2) is ultrasonically mixed uniformly, and the molar ratio of the mixed slurry components is nSiO 2 :nA1 2 o 3 :Na 2 O:nR1:nR2:nH 2 O=1:0.050:0.038:0.085:0.035:25;

[0072] 2) Stir the mixture in 1) above and move it into a hydrothermal crystallization reactor, stir at autogenous pressure and at a speed of 80 rpm, crystallize at 140°C for 24 hours, then heat up to 170°C for 72 hours. After th...

Embodiment 2

[0077] The process method of synthesizing SSZ-39 / SSZ-16 symbiotic composite molecular sieve is similar to embodiment 1, the difference is the molar ratio of the mixed sol in step 1) and step 2), the type of organic template agent, the type of silicon source, FAU Zeolite type and silicon-aluminum ratio, crystallization temperature and crystallization time, etc., step 3) take H-type SSZ-39 / SSZ-16 symbiotic composite silicon-aluminum molecular sieve 50.0g, use different soluble metal salt types, concentrations, solution volumes and metal loading capacity, and 4) in step 40.0g copper-modified SSZ-39 / SSZ-16 symbiotic composite molecular sieve, mixed with 20.0g silica sol (SiO 2 content: 30.0wt%) and 75.7g of deionized water were evenly mixed to make a catalyst slurry with a solid content of 33.9wt%, which was coated on the cordierite structured material by dipping method. The specific parameters in this embodiment are shown in Table 1, Table 2 and Table 3.

Embodiment 3

[0079] The process method of synthesizing SSZ-39 / SSZ-16 symbiotic composite molecular sieve is similar to embodiment 1, the difference is the molar ratio of the mixed sol in step 1) and step 2), the type of organic template agent, the type of silicon source, FAU Zeolite type and silicon-aluminum ratio, crystallization temperature and crystallization time, etc., step 3) take H-type SSZ-39 / SSZ-16 symbiotic composite silicon-aluminum molecular sieve 50.0g, use different soluble metal salt types, concentrations, solution volumes and metal loading capacity, and 4) in step 40g copper modified SSZ-39 / SSZ-16 symbiotic composite molecular sieve, mixed with 20.0g silica sol (SiO 2 content: 30.0 wt%) and 57.9 g of deionized water were uniformly mixed to prepare a catalyst slurry with a solid content of 39.0 wt%, which was coated on the cordierite structured material by dipping method. The specific parameters in this embodiment are shown in Table 1, Table 2 and Table 3.

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Abstract

The invention discloses an AEI / AFX topological structure symbiotic composite molecular sieve and a preparation method of an SCR catalyst, the AEI / AFX topological structure symbiotic composite molecular sieve is formed by symbiosis of AEI and AFX topological structure molecular sieves, and a characteristic diffraction peak exists at a 2 theta angle in an X-ray diffraction phase spectrogram of the molecular sieve with a symbiotic composite structure; wherein the molar ratio of silicon to aluminum oxide in the symbiotic composite molecular sieve is 10-200. In the preparation process of the symbiotic composite molecular sieve, a composite template agent is adopted; an FAU type silicon-aluminum molecular sieve is used as an aluminum source and a silicon source, other silicon sources and alkalisources can be combined to form mixed sol, an AEI / AFX symbiotic structure molecular sieve is synthesized through dynamic crystallization according to temperature sections, and then the AEI / AFX symbiotic structure molecular sieve exchanges with soluble metal salt cations to obtain the SCR molecular sieve catalyst. The SSZ-39 with the AEI structure and the SSZ-16 with the AFX structure form the symbiotic composite molecular sieve; the composite molecular sieve has more reasonably distributed acidity and good hydrothermal stability, has good catalytic activity and excellent service life in SCR reaction of NOx-containing gas discharged by a moving source and a fixed source, and can well meet the standard requirements of tail gas emission.

Description

technical field [0001] The invention relates to a symbiotic composite molecular sieve with AEI / AFX structure, its preparation method and SCR application, specifically relates to the synthesis of SSZ-39 / SSZ-16 symbiotic composite molecular sieve and its catalyst preparation, and belongs to the field of chemical synthesis technology and its application. Background technique [0002] AEI type molecular sieve has a three-dimensional pore system with a large cage, which can form a three-dimensional pore structure through 8-membered rings. The pore size is 0.38nm×0.38nm, and the skeleton density is 14.8. sphere. In the structure of AEI molecular sieve, two adjacent double 6-membered rings (d6r) connected by 4-membered rings are distributed mirror-symmetrically in space. AEI molecular sieve catalysts with ion-exchange or supported metal active components exhibit unique selective reduction reaction (SCR) activity and good reduction treatment performance for nitrogen oxides (NOx), ...

Claims

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Application Information

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IPC IPC(8): B01J29/80B01D53/94B01D53/56
CPCB01J29/80B01D53/9413B01J29/76B01J2229/18B01D2251/2062
Inventor 王志光柳海涛王炳春李进王贤彬
Owner CHINA CATALYST HLDG CO LTD
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