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Preparation method of SSZ-16 copper-containing catalyst

A SSZ-16, copper catalyst technology, applied in the field of catalysis, can solve the problems of long synthesis time, high cost, high silicon-aluminum ratio, etc.

Active Publication Date: 2022-03-22
TIANJIN PASSION ADVANCED MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the existing synthesis process uses high-cost templates to obtain a high silicon-aluminum ratio, and the synthesis time is long, it is not conducive to large-scale commercial application, and it is very important to reduce the synthesis cost

Method used

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  • Preparation method of SSZ-16 copper-containing catalyst
  • Preparation method of SSZ-16 copper-containing catalyst
  • Preparation method of SSZ-16 copper-containing catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045]Step 110: Add 40kg of N,N-dimethyl-1,4-cyclohexanediamine, 500kg of dimethyl carbonate and 20kg of pure water into a 1000L autoclave, raise the temperature to 140.0±5.0°C, keep the temperature for 12.0h, and cool down to 40-50°C; transfer the reaction solution into a 1000L stainless steel kettle, distill the solvent to dryness, and add 50.0kg of pure water;

[0046] Add 60kg of calcium hydroxide to the solution obtained in the previous step, add 100kg of pure water, heat up to 95.0°C, control the temperature at 95.0-97.0°C for 2 hours; cool down to 40.0-50.0°C, filter the reaction slurry with a filter, filter The cake was washed with 50.0 kg of pure water, and the filtrate and eluent were combined and packed into barrels to obtain 240 kg of a light yellow transparent solution, which was used as a molecular sieve template, and the mass content of the template was 25.0 ± 1.0 wt% as tested by titration.

[0047] Step S120:

[0048] Add template agent (content 25wt%) prepar...

Embodiment 2

[0055] It is basically the same as Example 1, except that in step S120, the molar ratio of alkali source to silicon is 0.35, the molar ratio of silicon to aluminum is 25, and the molar ratio of template agent to silicon is 0.18.

[0056] The catalyst was analyzed by an X-ray fluorescence elemental analyzer: the molar ratio of silicon to aluminum in the crystallized product was 20:1, the yield of the hydrogen-type SSZ-16 molecular sieve was 85%, and the copper atoms in the SSZ-16 copper-containing catalyst accounted for The mass ratio is 3.0%. SCR catalytic performance test results show that the NOx catalytic conversion efficiency reaches 100% when the temperature reaches 180°C, and the NOx catalytic conversion efficiency maintains 100% when the temperature reaches 530°C. In the temperature range of 180°C-530°C, the NOx catalytic conversion efficiency maintains 100%. Stablize.

Embodiment 3

[0058] It is basically the same as Example 1, except that in step S120, the molar ratio of alkali source to silicon is 0.42, the molar ratio of silicon to aluminum is 33, and the molar ratio of template agent to silicon is 0.22.

[0059] The catalyst was analyzed by an X-ray fluorescence elemental analyzer: the molar ratio of silicon to aluminum in the crystallized product was 25:1, the yield of the hydrogen-type SSZ-16 molecular sieve was 80%, and the copper atoms in the SSZ-16 copper-containing catalyst accounted for The mass ratio is 2.7%. SCR catalytic performance test results show that the NOx catalytic conversion efficiency reaches 100% when the temperature reaches 195°C, and the NOx catalytic conversion efficiency maintains 100% when the temperature reaches 510°C. In the temperature range of 195°C-510°C, the NOx catalytic conversion efficiency maintains 100%. Stablize.

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Abstract

The invention relates to a preparation method of an SSZ-16 copper-containing catalyst. The method comprises the following steps: uniformly mixing an FAU type silicon-aluminum molecular sieve, an alkali source, a silicon source, an aluminum source and a seed crystal in deionized water to form a solution, carrying out dynamic crystallization hydrothermal synthesis to obtain an SSZ-16 molecular sieve, dispersing the molecular sieve in the copper salt solution, stirring, filtering, washing, drying and roasting to obtain the SSZ-16 molecular sieve. The SSZ-16 copper-containing catalyst is obtained. Due to the relatively high specific surface area and relatively high hydrothermal stability, the material has high NH3-SCR activity and selectivity and long service life.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a preparation method of an SSZ-16 copper-containing catalyst. Background technique [0002] Zeolite molecular sieves, such as SSZ-13 and SSZ-39, are used in the treatment of X NH of diesel vehicle exhaust 3 It shows superior activity and catalytic stability in selective catalytic reduction technology. AFX molecular sieve is a small-pore molecular sieve with a unique 8-membered ring hole and cage structure. It has the characteristics of low skeleton density and high adsorption capacity, which makes it have great advantages and commercial value in all aspects. . As the application of tail gas denitrification treatment, highly active copper species is the key factor in the catalytic process. There is a strong correlation between the activity of copper species and the topological structure of molecular sieves. The existence of small pores can also better reduce the formation of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J35/10B01D53/86B01D53/56
CPCB01J29/76B01D53/8628B01J2229/183B01J35/617Y02T10/12
Inventor 梁珂周琦龙江湘徐锋王成然
Owner TIANJIN PASSION ADVANCED MATERIAL TECH CO LTD