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Synthesis method of multi-stage pore structure zeolite nanosheet

A synthesis method and nanosheet technology, applied in the direction of crystalline aluminosilicate zeolite, mercerized crystalline aluminosilicate zeolite, chemical instruments and methods, etc., can solve the problem of expensive template agent, low integrity of nanosheets, stripping and purification process Complicated and other issues, to achieve the effects of reduced preparation costs, good mechanical stability, and high crystallinity

Active Publication Date: 2019-10-25
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current methods for synthesizing MFI nanosheets generally have problems such as expensive templates, complicated stripping and purification processes, and low integrity of nanosheets.

Method used

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  • Synthesis method of multi-stage pore structure zeolite nanosheet
  • Synthesis method of multi-stage pore structure zeolite nanosheet
  • Synthesis method of multi-stage pore structure zeolite nanosheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (1) 2.57g tetrapropylammonium hydroxide solution (25wt.%) was mixed with 12.475g deionized water, and stirred evenly to obtain solution A (the concentration of tetrapropylammonium hydroxide was 0.21M);

[0055] (2) Add 0.2 g of a pure silicon-type MFI zeolite molecular sieve precursor with a c-axis size of 0.4 μm to the above-mentioned solution A, and after uniform dispersion, a solution B is obtained;

[0056] (3) Put solution B into a crystallization kettle, and conduct a hydrothermal reaction at 170°C for 18 hours;

[0057] (4) After the step (3) is completed, the obtained solid product is centrifuged, washed with water, dried at 100°C for 12h, and calcined at 550°C for 6h to obtain MFI zeolite nanosheets with a c-axis size of 0.3μm. .

[0058] The scanning electron microscope characterization of pure silicon type MFI zeolite molecular sieve is as follows: figure 2 As shown, the morphology of the molecular sieve is coffin-shaped, and the particle size (0.4 μm) is ...

Embodiment 2

[0060] (1) Mix 4.6g of tetrapropylammonium hydroxide solution (25wt.%) with 22.329g of deionized water, and stir evenly to obtain solution A (the concentration of tetrapropylammonium hydroxide is 0.21M);

[0061] (2) Add 0.4 g of the pure silicon-type MFI zeolite molecular sieve precursor with a c-axis size of 0.4 μm to the above solution A, and obtain solution B after uniform dispersion;

[0062] (3) Put solution B into a crystallization kettle, and conduct a hydrothermal reaction at 170°C for 18 hours;

[0063] (4) After the step (3) is completed, the obtained solid product is centrifuged, washed with water, dried at 100°C for 12h, and calcined at 550°C for 6h to obtain MFI zeolite nanosheets with a c-axis size of 0.3μm. .

[0064] The scanning electron microscope characterization of the obtained nanosheets is as follows: Figure 4 As shown, the nanosheets are also monodisperse sheet-like structures.

Embodiment 3

[0066] (1) 2.91g tetrapropylammonium hydroxide solution (25wt.%) was mixed with 13.585g deionized water, and stirred evenly to obtain solution A (the concentration of tetrapropylammonium hydroxide was 0.217M);

[0067] (2) Add 0.2 g of the pure silicon-type MFI zeolite molecular sieve precursor with a c-axis size of 1.2 μm to the above solution A, and obtain solution B after uniform dispersion;

[0068] (3) Put solution B into a crystallization kettle, and conduct a hydrothermal reaction at 170°C for 18 hours;

[0069] (4) After the step (3) is completed, the obtained solid product is centrifuged, washed with water, dried at 100°C for 12 hours, and calcined at 550°C for 6 hours to obtain MFI zeolite nanosheets with a c-axis size of 1.0 μm. .

[0070] The scanning electron microscope characterization of pure silicon type MFI zeolite molecular sieve is as follows: Figure 5 As shown, the shape of the molecular sieve is coffin-shaped, and the particle size (0.9×0.45×1.2μm 3 ) ...

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Abstract

The invention provides a synthesis method of a multi-stage pore structure zeolite nanosheet. An organic alkali solution is used for carrying out traditional hydrothermal treatment on block-shaped zeolite molecular sieve mother bodies of different sizes to synthesize the multi-stage pore structure zeolite nanosheet with different sizes and high thermal, chemical and mechanical stability. The synthesis method specifically includes the following steps that calcined molecular sieve mother bodies are evenly dispersed in the organic alkali solution for hydrothermal reaction, and washing, drying andcalcining are conducted to obtain the multi-stage pore structure zeolite nanosheet. According to the synthesis method of the multi-stage pore structure zeolite nanosheet, the precise adjustment of theshape and size of the multi-stage pore structure zeolite nanosheet can be realized. The multi-stage pore structure zeolite nanosheet has high crystallinity and dispersion, at the same time, operationprocedures are simple, the period is short, pollution is small, the cost is low, universality is strong, and industrial application prospects are good.

Description

technical field [0001] The invention relates to the technical field of molecular sieve synthesis, in particular to a method for synthesizing zeolite nanosheets with a hierarchical pore structure. Background technique [0002] Among the many types of zeolite molecular sieves (such as: MFI-like structure, CHA-like structure, BEA-like structure, MOR-like structure and MWW-like structure), molecular sieves with MFI-type topology have a very wide range of applications, mainly including pure silicalite Silicalite-1, silicalite ZSM-5, titanium silicalite TS-1 and borosilicate B-MFI. The pore system of MFI molecular sieve consists of straight channels of 0.53×0.56nm and zigzag channels of 0.51×0.55nm. Its size is similar to the molecular dynamics diameter of many important substances in industry. Therefore, it has been widely used since its synthesis. in the field of adsorption, separation and catalysis. [0003] However, the single microporous structure of traditional MFI zeolite...

Claims

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Application Information

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IPC IPC(8): C01B39/02C01B39/04C01B39/26
CPCC01B39/026C01B39/04C01B39/265C01P2002/72C01P2004/03C01P2004/04C01P2004/62C01P2004/20C01P2006/12
Inventor 刘毅刘益
Owner DALIAN UNIV OF TECH
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