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Variable pillared ZSM-5 nanosheet molecular sieve and preparation method thereof

A technology of ZSM-5 and nanosheets, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, hydrocarbon cracking and hydrocarbon production, etc. It can solve the problems of limiting the diversity of pore structures and the inability to adjust the height of pillars, etc.

Active Publication Date: 2022-01-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently used double-template pillaring method cannot adjust the height of the pillars, which greatly limits the diversity of its pore structure.

Method used

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  • Variable pillared ZSM-5 nanosheet molecular sieve and preparation method thereof
  • Variable pillared ZSM-5 nanosheet molecular sieve and preparation method thereof
  • Variable pillared ZSM-5 nanosheet molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～8

[0029] [Example 1~8] 0.66g sodium hydroxide is dissolved in 3.12g deionized water, 0.49g H 2 SO 4 Dissolve in 4.2 g of deionized water, and add the acidic solution dropwise to the alkaline solution under vigorous stirring. After cooling to room temperature, 0.18 g of aluminum sulfate octadecahydrate was added to the mixture. Then, 0.89 g of tetrabutylammonium hydroxide and 5.73 g of tetraethylorthosilicate were added to the mixture in sequence, and the mixture was aged at 25° C. for 20 hours with vigorous stirring using a magnetic stirrer to form a gel. Finally, the above gel mixture was mixed with 1.99 g of C dissolved in 12.12 g of deionized water 22 h 45 -N + Br - (CH 3 ) 2 -C 6 h 12 -N + Br - (CH 3 ) 2 -C 6 h 13 (C 22-6-6 ) solution mixed. After stirring continuously at 25°C for 2 hours, the resulting gel was transferred to a 50ml reactor, and hydrothermally crystallized at 150°C for 5 days. During the crystallization process, the reactor was kept rotating...

Embodiment 1

[0031] The small-angle X-ray diffraction figure of the prepared catalyst of embodiment 1-8 is as follows figure 1 shown. from figure 1 It can be seen from the figure that the double-template method realizes effective pillars between the nanosheets, making it form sharp characteristic peaks in small-angle X-ray diffraction. Adjustment effect, the prepared nanosheet molecular sieves have different interlayer thicknesses and pillar heights. The scanning electron microscope picture of embodiment 1 is as figure 2 As shown, the transmission electron microscope image is shown in image 3 shown. The pillared nanosheet molecular sieve exhibits the morphology of nanoflowers, and the nanosheets and mesoporous layers are arranged in an orderly manner in the microstructure.

Embodiment 9

[0032] [Example 9] Dissolving 0.66g sodium hydroxide in 3.12g deionized water, 0.49g H 2 SO 4 Dissolve in 4.2 g of deionized water, and add the acidic solution dropwise to the alkaline solution under vigorous stirring. After cooling to room temperature, 0.18 g of aluminum sulfate octadecahydrate was added to the mixture. Then, 0.89 g of tetrabutylammonium bromide and 5.73 g of tetraethylorthosilicate were added to the mixture in sequence, and the mixture was aged at 25° C. for 20 hours with vigorous stirring using a magnetic stirrer to form a gel. Finally, the above gel mixture was dissolved in 12.12 g deionized water with 1.99 g C 22-6-6 The solution is mixed. After stirring continuously at 25°C for 2 hours, the resulting gel was transferred to a 50ml reactor, and hydrothermally crystallized at 150°C for 5 days. During the crystallization process, the reactor was kept rotating at a constant speed of 40rmp, and a white mixture was obtained after crystallization. Solution, ...

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Abstract

The invention discloses a variable pillared ZSM-5 nanosheet molecular sieve and a preparation method thereof, and belongs to the technical field of catalysts. The pillared molecular sieve is composed of orderly arranged nanosheet layers and interlayer MFI structure columns, the pillared height is adjustable in the range of 4-7nm, and the method specifically comprises the following steps: 1) dissolving an inorganic base, an inorganic acid, a small molecule template agent, a silicon source and an aluminum source in water, and uniformly stirring to form gel; 2) aging under a stirring condition; (3) continuously adding a long-carbon-chain amphiphilic surfactant solution and uniformly stirring; 4) aging under a stirring condition; and (5) crystallizing to obtain the pillared ZSM-5 nanosheet molecular sieve. According to the preparation method disclosed by the invention, the limitation of single pillared interlayer spacing in pillared preparation of the nanosheet molecular sieve at the present stage is solved, the nanosheet molecular sieve with the variable pillared interlayer spacing is prepared by a double-template method, and the prepared variable pillared ZSM-5 nanosheet molecular sieve can be used as a catalyst in the catalytic fields of preparation of low-carbon olefins and the like, and has high catalytic activity.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a variable pillar-supported ZSM-5 nanosheet molecular sieve and a preparation method thereof, which can be used as a catalyst for the preparation of low-carbon olefins, and has good low-carbon olefin selectivity and anti-carbon deposition performance. Background technique [0002] Molecular sieves are widely used in many fields because of their good hydrothermal stability, anti-coking performance, unique pore structure and acid properties. However, its single microporous system limits its scope of application, and the narrow pores reduce the diffusion efficiency of reactant molecules in catalytic reactions and reduce the utilization rate of active sites. When the product cannot diffuse out of the pores in time, it will also cause violent side reactions to generate a large amount of carbon deposits, shortening the service life of the catalyst. [0003] Therefore, it is very necessary to...

Claims

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Application Information

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IPC IPC(8): C01B39/40B01J29/40C07C4/06C07C9/02C07C11/02
CPCC01B39/40B01J29/40C07C4/06C01P2002/72C01P2004/03C01P2004/04C01P2004/20C07C11/02C07C9/02Y02P20/52
Inventor 陈丰秋郝靓程党国詹晓力
Owner ZHEJIANG UNIV
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