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Hollow Cu-SSZ-13 molecular sieve catalyst and application thereof

A technology of cu-ssz-13 and molecular sieve, which is applied in the direction of molecular sieve catalyst, catalyst activation/preparation, physical/chemical process catalyst, etc., can solve the problems of high cost, complicated procedure, easy to destroy molecular sieve structure, etc., and achieve low cost, catalytic The effect of high activity and widening activity window

Active Publication Date: 2020-04-14
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional hollow structure is mainly through two-step acid-base treatment method, the procedure is complicated, the cost is high, and the molecular sieve structure is easy to be damaged.

Method used

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  • Hollow Cu-SSZ-13 molecular sieve catalyst and application thereof
  • Hollow Cu-SSZ-13 molecular sieve catalyst and application thereof
  • Hollow Cu-SSZ-13 molecular sieve catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of hollow Cu-SSZ-13 molecular sieve catalyst and its application in NH 3 - Application of the SCR reaction, comprising the following steps:

[0033] (1) After mixing and stirring deionized water and NaOH evenly, add an aqueous solution of N,N,N-trimethyl-1-adamantyl ammonium hydroxide with a mass fraction of 25%, and obtain a mixed solution after fully stirring; Add polyethyleneimine (Mw=1800, the same as the following examples), stir and mix well, then add Al(OH) 3 The solid powder is mixed and stirred; the silica sol is added dropwise to the mixed solution and stirred evenly. The above mixed solution was put into a hydrothermal kettle, crystallized at 160°C for 3 days, washed by centrifugation, dried, and calcined at 600°C for 8 hours to obtain a hollow single crystal SSZ-13 molecular sieve; wherein, the molar ratio of each component in the system For: 62H 2 O: 0.3NaOH: 0.2TMAda: 0.16PEIM: 0.048Al 2 o 3 : 1Si 2 O.

[0034] (2) Stir Na-type molecular...

Embodiment 2

[0040] Preparation of hollow Cu-SSZ-13 molecular sieve catalyst and its application in NH 3 -The application of SCR reaction, compares embodiment 1, increased the content of NaOH, comprises the following steps:

[0041] (1) After mixing and stirring deionized water and NaOH evenly, add an aqueous solution of N,N,N-trimethyl-1-adamantyl ammonium hydroxide with a mass fraction of 25%, and obtain a mixed solution after fully stirring; Add polyethyleneimine to the mixture, stir well and mix well, then add Al(OH) 3 The solid powder is mixed and stirred; the silica sol is added dropwise to the mixed solution and stirred evenly. Put the above mixed solution into a hydrothermal kettle, crystallize at 160°C for 3 days, centrifuge wash, dry, and roast at 600°C for 8 hours to obtain a hollow single crystal SSZ-13 molecular sieve; wherein, the molar ratio of feeding is: 62H 2 O: 0.34NaOH: 0.2TMAda: 0.16PEIM: 0.048Al 2 o 3 : 1Si 2 O.

[0042] (2) Stir Na-type molecular sieve and ammo...

Embodiment 3

[0048] Preparation of hollow Cu-SSZ-13 molecular sieve catalyst and its application in NH 3 -The application of SCR reaction, compared to embodiment 1, increased the dosage of polyethyleneimine, comprises the following steps:

[0049] (1) After mixing and stirring deionized water and NaOH evenly, add an aqueous solution of N,N,N-trimethyl-1-adamantyl ammonium hydroxide with a mass fraction of 25%, and obtain a mixed solution after fully stirring; Add polyethyleneimine to the mixture, stir well and mix well, then add Al(OH) 3 The solid powder is mixed and stirred; the silica sol is added dropwise to the mixed solution and stirred evenly. Put the above mixed solution into a hydrothermal kettle, crystallize at 160°C for 3 days, wash centrifugally, dry, and roast at 600°C for 8 hours to obtain a hollow single-crystal SSZ-13 molecular sieve; wherein, the molar ratio of feed is: 62H 2 O: 0.3NaOH: 0.2TMAda: 0.19PEIM: 0.048Al 2 o 3 : 1Si 2 O.

[0050] (2) Stir Na-type molecular ...

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Abstract

The invention discloses a preparation method of a Cu-SSZ-13 molecular sieve with a hollow structure and a method for selectively catalyzing NH3 to reduce NO. The preparation method comprises the following steps: firstly, performing one-step hydrothermal crystallization on gel formed by fully mixing a silicon source, an aluminum source, an inorganic alkali, a microporous template agent and an organic additive to directly prepare a hollow single crystal SSZ-13 molecular sieve; then respectively carrying out NH4 <+> and Cu <2+> ion exchange, centrifugal washing, drying and roasting to prepare a Cu-SSZ-13 molecular sieve with a hollow structure; and finally, under the catalytic action of the Cu-SSZ-13 molecular sieve with a hollow structure, selectively reducing NO into N2 by taking NH3 as a reducing agent. The SSZ-13 molecular sieve with the hollow structure is prepared through a one-step hydrothermal method, and compared with a traditional two-step acid-alkali treatment method, the SSZ-13 molecular sieve is more economical, simpler and more efficient; meanwhile, in the NO reduction reaction, mass transfer diffusion of all reaction molecules is facilitated, so that the NO reduction activity is effectively improved, the active window is widened, and the catalyst is more suitable for the NO reduction reaction under a high space velocity condition.

Description

technical field [0001] The invention relates to the removal of nitrogen oxide gas pollutants contained in fixed source flue gas such as boilers, incinerators, and exhaust gas from diesel vehicles, that is, the field of denitrification molecular sieve catalyst reaction, and specifically relates to the preparation of hollow Cu-SSZ-13 molecular sieve catalysts and apply. Background technique [0002] In recent years, as air pollution has become more and more serious, people have paid more and more attention to the emission of air pollutants. NO X It is clearly listed as a class of pollutants subject to total amount control. Its emission density is high and the emission is concentrated, causing serious harm. It is one of the most difficult pollutants to remove. During the operation of diesel vehicles, a large amount of NO will be produced X , causing serious air pollution. NH 3 Selective Catalytic Reduction of NO X (NH 3 -SCR) is a mature and effective diesel vehicle exha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J37/10B01D53/86B01D53/94B01D53/56
CPCB01J29/76B01J37/10B01D53/8628B01D53/9413B01D2251/2062B01D2255/65B01D2258/012B01D2258/0283Y02A50/20
Inventor 刘立成邓舒君王志恒
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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