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Cu-SSZ-13 catalyst and H-SSZ-13 molecular sieve with double aluminum centers and preparation methods and application thereof

A technology of cu-ssz-13 and molecular sieve, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, separation methods, etc., can solve the problems of unfavorable adsorption activation, high preparation cost, poor catalytic activity and heat resistance, and achieve excellent Catalytic activity, improved dispersion, and strong controllability

Pending Publication Date: 2020-08-11
李云龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome that the quantity of the acid center in existing Cu-SSZ-13 catalyst is less, is unfavorable for reducing agent NH 3 Adsorption and activation of molecules, and Cu-SSZ-13 catalyst has the disadvantages of poor catalytic activity and heat resistance and high preparation cost, providing a CHA cage with a Cu-SSZ-13 catalyst with double aluminum centers and a CHA cage H-SSZ-13 molecular sieves with double aluminum centers and their preparation methods and applications

Method used

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  • Cu-SSZ-13 catalyst and H-SSZ-13 molecular sieve with double aluminum centers and preparation methods and application thereof
  • Cu-SSZ-13 catalyst and H-SSZ-13 molecular sieve with double aluminum centers and preparation methods and application thereof
  • Cu-SSZ-13 catalyst and H-SSZ-13 molecular sieve with double aluminum centers and preparation methods and application thereof

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preparation example Construction

[0033] As previously mentioned, the second aspect of the present invention provides a kind of preparation method that aforementioned CHA cage has the Cu-SSZ-13 catalyst of double aluminum center, and this method comprises:

[0034] (1) mixing and aging the first solvent, the first silicon source, the first aluminum source, the first alkali source, the first copper source and diethylenetriamine in sequence to obtain a directing agent solution,

[0035] (2) Contacting the second solvent, the second silicon source, the second aluminum source and the second alkali source, and adding the directing agent solution to the contact product, and then crystallizing, filtering and drying the resulting mixture in sequence ,

[0036] Wherein, in step (1), the consumption of the first solvent, the first silicon source, the first aluminum source, the first alkali source, the copper source and diethylenetriamine makes in the directing agent solution, the first solvent: SiO 2 :Al 2 o 3 : Na ...

Embodiment 1

[0076] (1) Preparation of directing agent solution

[0077] Dissolve 3.6g of sodium metaaluminate in 60g of water, add 25g of NaOH to it, stir at 25°C for 30min, add 135g of water glass, 20g of DETA, stir at 25°C for 1h, then add 16g of CuSO to the resulting solution 4 , stirred at a temperature of 25° C. for 3 hours, kept at a temperature of 25° C. and aged for more than 24 hours.

[0078] (2) Preparation of Cu-SSZ-13 catalyst with double aluminum center in CHA cage

[0079] At 25°C, 4g H 2 O, 0.03g NaOH, 0.65g sodium metaaluminate and 3.32g silica sol were placed in a beaker and mixed, and then 1% by weight of the aforementioned directing agent solution was added to the resulting mixture, and stirred for 3h at a temperature of 25°C. The gel was obtained, and then the gel was added to a polytetrafluoroethylene stainless steel reaction kettle, and crystallized at 140°C for 2 days. The sample was completely crystallized, and the obtained crystallized product was suction-filte...

Embodiment 2

[0084] (1) Preparation of directing agent solution

[0085] Dissolve 4g of sodium metaaluminate in 60g of water, add 30g of NaOH to it, stir at 35°C for 10min, add 135g of water glass, 30g of DETA, stir at 35°C for 30min, then add 24g of CuSO to the resulting solution 4 , stirred at a temperature of 35°C for 4h, and kept at a temperature of 35°C for static aging for more than 32h for later use.

[0086] (2) Preparation of Cu-SSZ-13 catalyst with double aluminum center in CHA cage

[0087] At 35°C, 2.5g H 2 O, 0.08g NaOH, 0.26g sodium metaaluminate and 3.32g white carbon black were placed in a beaker and mixed, then 1% by weight of the aforementioned directing agent solution was added to the resulting mixture, and stirred for 3h at a temperature of 35°C , to obtain a gel, and then add this gel into a polytetrafluoroethylene stainless steel reaction kettle, crystallize at 160 ° C for 12 hours, the sample is completely crystallized, filter the crystallized product obtained, and...

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Abstract

The invention relates to the field of zeolite molecular sieve catalysts, and discloses a Cu-SSZ-13 catalyst and an H-SSZ-13 molecular sieve with a CHA cage having double aluminum centers and a preparation method and application thereof. The Cu-SSZ-13 catalyst includes an SSZ-13 molecular sieve and a copper element and is characterized in that the topological structure of the SSZ-13 molecular sievecomprises various ellipsoidal CHA cages including ellipsoidal CHA cages with double aluminum centers, and the content of the ellipsoidal CHA cages with the double aluminum centers is 50% or above onthe basis of the total number of the ellipsoidal CHA cages in the SSZ-13 molecular sieve. The Cu-SSZ-13 catalyst and the H-SSZ-13 molecular sieve with the CHA cage having double aluminum centers haveexcellent catalytic activity and hydrothermal resistance stability when used for catalyzing a selective reduction reaction of nitrogen oxide, and the preparation method is simple and easy to operate,good in economy and high in silicon-aluminum ratio controllability.

Description

technical field [0001] The present invention relates to the field of zeolite molecular sieve catalysts with a CHA crystal structure, in particular to a Cu-SSZ-13 catalyst with a CHA cage having a double aluminum center, a preparation method for the aforementioned Cu-SSZ-13 catalyst with a double aluminum center in a CHA cage, a A preparation method of H-SSZ-13 molecular sieve with double aluminum center in CHA cage, H-SSZ-13 with double aluminum center in CHA cage obtained from the preparation method of H-SSZ-13 molecular sieve with double aluminum center in CHA cage Molecular sieves, as well as the aforementioned Cu-SSZ-13 catalyst with double aluminum centers in the CHA cage and H-SSZ-13 molecular sieve with double aluminum centers in the CHA cage are used as amine selective catalysts in the removal of nitrogen oxides in diesel vehicle exhaust. Background technique [0002] Mobile source denitrification technology is a hot research issue at present, especially the current ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/76B01J29/70B01J37/30B01D53/94B01D53/56B01D53/88
CPCB01J29/763B01J29/7015B01J37/30B01D53/9413B01D53/88B01J2229/183B01D2258/012Y02T10/12
Inventor 周跃
Owner 李云龙
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