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SSZ-13 molecular sieves, production, SCR catalyst and production

A technology of SCR catalyst and hydrogen molecular sieve, which is applied in the field of catalysis to achieve the effects of excellent high temperature aging resistance, wide operating temperature window and stable structure

Active Publication Date: 2019-11-05
合肥派森新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the influence of the SSZ-13 hydrogen-type molecular sieve prepared in the prior art, the operating temperature window of the Cu-SSZ-13 catalyst prepared using the molecular sieve as a raw material has not yet reached a satisfactory width. How to improve the SSZ-13 The anti-aging performance of hydrogen-type molecular sieves, thereby broadening the width of the catalyst's operating temperature window, has become a topic that needs further research

Method used

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  • SSZ-13 molecular sieves, production, SCR catalyst and production
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  • SSZ-13 molecular sieves, production, SCR catalyst and production

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preparation example Construction

[0048] According to an aspect of the present invention, a kind of preparation method of SSZ-13 hydrogen type molecular sieve is provided, comprising:

[0049] Step S110: mixing the aluminum source, the template composition, the silicon source and the alkaline aqueous solution, and performing a gelation reaction to obtain a gel;

[0050] Step S120: crystallizing, calcining, and ammonium exchange the gel to obtain the SSZ-13 hydrogen molecular sieve;

[0051] The templating agent composition includes N,N,N-trimethylbicyclo[2,2,2]octane-2-ammonium hydroxide and at least one additional templating agent.

[0052] Step S120 is specifically: under the action of the seed crystal, the gel undergoes a crystallization reaction to obtain a crystallized product; the crystallized product is roasted to obtain a roasted product, and then the roasted product is ion-exchanged in an ammonium salt solution to obtain SSZ -13 hydrogen type molecular sieve.

[0053] The template composition comprisi...

Embodiment 1

[0086] Step S110: Add KOH and Al to a 500mL Erlenmeyer flask at room temperature 2 (SO 4 ) 3 .18H 2 O, the aqueous solution containing N,N,N-trimethylbicyclo[2,2,2]octane-2-ammonium hydroxide (mass concentration is 25.4%), tetraethylammonium hydroxide and deionized water, normal temperature Stir for 1h to dissolve, then add dropwise silica sol for 10min, then stir at 30°C for 2h to form a gel; among them, N,N,N-trimethylbicyclo[2,2,2]octane-2-ammonium hydroxide, Tetraethylammonium hydroxide and SiO in silica sol 2 The molar ratio is 0.06:0.02:1, SiO in silica sol 2 with Al 2 (SO 4 ) 3 .18H 2 Al in O 2 o 3 The molar ratio is 20:1, potassium hydroxide and SiO in silica sol 2 The molar ratio is 0.35:1.

[0087] Step S120: Move the gel into the hydrothermal reaction kettle, add seed crystals, seal it well, place the hydrothermal reaction kettle in a blast oven, and react at 160°C for 48 hours to complete the reaction, and then cool the reaction slurry Filter through a...

Embodiment 2

[0095] Step S110: Add KOH and Al to the Erlenmeyer flask at room temperature 2 (SO 4 ) 3 .18H 2 O, containing N,N,N-trimethylbicyclo[2,2,2]octane-2-ammonium hydroxide aqueous solution (mass concentration is 25.4%), tetramethylammonium hydroxide, choline chloride and Deionized water, stirring at room temperature for 1 hour to dissolve, then dropwise adding silica sol for 10 minutes, then stirring at 30°C for 2 hours to form a gel; wherein, N,N,N-trimethylbicyclo[2,2,2]octane-2 - SiO in ammonium hydroxide, tetramethylammonium hydroxide, choline chloride and silica sol 2 The molar ratio is 0.03:0.015:0.015:1, SiO in silica sol 2 with Al 2 (SO 4 ) 3 .18H 2 Al in O 2 o 3 The molar ratio is 13:1, potassium hydroxide and SiO in silica sol 2 The molar ratio is 0.56:1.

[0096] Step S120: Move the gel into the hydrothermal reaction kettle, add seed crystals, seal it well, place the hydrothermal reaction kettle in a blast oven, and react at 180°C for 12 hours to complete the...

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Abstract

The invention relates to the technical field of catalysis, in particular to SSZ-13 molecular sieves, production, an SCR catalyst and production. A production method of the SSZ-13 hydrogen-type molecular sieves comprises the steps of (1) mixing an aluminium source, a template composition, a silicon source and an alkaline aqueous solution, and carrying out a gelation reaction to obtain gel; and (2)conducting crystallization, calcination and ammonium exchange on the gel to obtain the SSZ-13 hydrogen-type molecular sieves. The template composition comprises N,N,N-trimethylbicyclo[2,2,2]octane-2-ammonium hydroxide and at least one additional template.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to SSZ-13 molecular sieve and its preparation, SCR catalyst and its preparation. Background technique [0002] Selective Catalytic Reduction (SCR) catalyst is a catalyst used in denitrification systems of power plants and motor vehicles. In the SCR reaction, the SCR catalyst can promote the chemical reaction of the reducing agent selectively with the nitrogen oxides in the flue gas at a certain temperature. [0003] In the prior art, the SCR catalyst is mainly WO 3 or MoO 3 Doped V 2 o 5 / TiO 2 Catalyst, but there are many problems in this kind of catalyst, such as V with biological toxicity 2 o 5 Shedding occurs during use, threatening human health, the operating temperature window is narrow, and the low temperature section is poorly selected. [0004] The Cu-SSZ-13 catalyst has high catalytic activity, good hydrothermal stability, and strong resistance to HCs poisoning, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B01J29/70
CPCB01J29/70C01B39/04C01P2002/72C01P2004/03
Inventor 梁珂王广涛
Owner 合肥派森新材料技术有限公司
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