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Hierarchical zeolite, preparation and application thereof

A channel and zeolite technology, applied in the field of catalyst preparation and application, can solve problems such as poor crystallization, and achieve the effect of simple process and low cost

Active Publication Date: 2012-07-04
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The study found that it takes 3 days to prepare highly crystalline zeolite using this template; after 3 hours of hydrothermal synthesis, a certain zeolite phase appeared, but the crystallization was poor

Method used

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  • Hierarchical zeolite, preparation and application thereof
  • Hierarchical zeolite, preparation and application thereof
  • Hierarchical zeolite, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] According to the ratio of SiO 2 :TPOAC:TPAOH:Na 2 O:Al 2 o 3 :H 2 O=1:0.03:0.3:0.06:0.02:80 to configure the solution, the specific steps are as follows: TPAOH, H 2 O, NaOH, NaAlO 2 Prepare a solution with TPOAC (trimethoxysilylpropyldimethyloctadecylammonium chloride), stir evenly, then add TEOS dropwise, stir for 18 hours, heat with microwave power of 800W, and crystallize at 80°C for 0.5 h, and then crystallized at 165°C for 3h, the obtained product was filtered, washed with deionized water until neutral, dried at 110°C for 12h, and then calcined at 550°C for 6h to remove the template to prepare the multi-level channel ZSM-5. The XRD spectrum can be seen as MFI structure, and the SEM and TEM photos can be seen that the synthesized zeolite is about 2 μm in size and has a mesoporous structure. The nitrogen adsorption results show that it is a type IV isotherm, indicating that it has a mesoporous structure and a pore size of 4 nm. left and right, such as Figure ...

Embodiment 2

[0035] According to the ratio of SiO 2 :TPOAC:TPAOH:Na 2 O:Al 2 o 3 :H 2 O=1 : 0.01 : 0.3 : 0.06 : 0.02 : 80 to prepare the solution, and the other process steps and process conditions are the same as in Example 1, and the multi-level channel ZSM-5 can be prepared.

Embodiment 3

[0037] According to the ratio of SiO 2 :TPOAC:TPAOH:Na 2 O:Al 2 o 3 :H 2 O=1 : 0.05 : 0.3 : 0.06 : 0.02 : 80 to prepare the solution, and the other process steps and process conditions are the same as in Example 1, and the multi-level channel ZSM-5 can be prepared.

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Abstract

The invention relates to hierarchical zeolite, preparation and application thereof, and belongs to the technical field of catalyst preparation and application. A hierarchical zeolite molecular sieve is synthesized under a microwave assisted heating condition by utilizing organosilane or a mixture of organosilane and surfactant as a template. Compared with traditional hydrothermal synthesis, microwave hydrothermal synthesis has the advantages of high efficiency, quickness, environment friendliness, simple process, low cost and the like. The synthesized material combines the advantages of nano-porous zeolite and a mesoporous material, realizes combination of nano-pores and mesopores, maintains strong acidity, high selectivity and high hydrothermal stability of the nano-porous zeolite, and has the advantage that the large pore diameter of the mesoporous material facilitates molecular diffusion. The material has wide application prospects in petrochemical industry, coal chemical industry and fine chemical engineering.

Description

technical field [0001] The invention relates to a multi-stage pore zeolite and its preparation and application, belonging to the technical field of catalyst preparation and application. Background technique [0002] Traditional microporous zeolites have the advantages of good hydrothermal stability, strong acidity and high selectivity, and are widely used in catalysis, adsorption and other fields. However, its pore size is small, and it fails to show significant advantages in macromolecular catalysis and adsorption. Mesoporous materials have the advantages of large pore size, which is conducive to molecular diffusion, and have great application potential in macromolecular catalysis and adsorption. However, due to the amorphous pore wall, their hydrothermal stability and acidity are greatly reduced. In order to overcome this Due to the shortcomings of the two porous materials, the researchers developed a multi-level pore zeolite molecular sieve, which combines the advantages...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
Inventor 胡浩权刘斯宝房承宣靳立军郭学华彭胜
Owner DALIAN UNIV OF TECH
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