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Multistage pore-structure molecular sieve catalyst and preparation method thereof

A molecular sieve and catalyst technology, applied in the field of hierarchical pore structure nano molecular sieve catalyst and its preparation, can solve the problems of complex process and the like

Inactive Publication Date: 2011-05-11
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can produce molecular sieves with ideal pore size, and metal oxides can be selected to expand the catalytic field of molecular sieves, but the process of this method is also relatively complicated

Method used

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  • Multistage pore-structure molecular sieve catalyst and preparation method thereof
  • Multistage pore-structure molecular sieve catalyst and preparation method thereof
  • Multistage pore-structure molecular sieve catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Mix 7.80g (0.1mol) of silicic acid, 2.50g (0.0625mol) of sodium hydroxide, 2.66g (0.01mol) of tetrapropylammonium bromide and 100ml of water to form B liquid; 2 (SO 4 ) 3 18H 2 O) 0.66g (1mmol), 1ml of 90wt% concentrated sulfuric acid, 0.4g of polyaniline and 10ml of water are mixed uniformly to form A liquid, and the pH value is 0~1;

[0027] (2) Add liquid B dropwise to liquid A under stirring, stir at room temperature for 3 hours to make a uniform gel; put the reaction mixture into a synthesis reactor, age at 50°C for 4 hours, and crystallize at 150°C For 48h, make it crystallize under static condition;

[0028] (3) After the crystallization is complete, the product is centrifuged, washed with deionized water until the pH is 9-10, dried at 110°C, and roasted at 500°C for 3 hours to remove tetrapropylammonium bromide and polyaniline, thereby obtaining the average Grain diameter 3μm, SiO 2 / Al 2 o 3 Mole ratio of 100 ZSM-5 molecular sieve catalyst A with hie...

Embodiment 2

[0030] (1) Mix 7.80g (0.1mol) of silicic acid, 2.50g (0.0625mol) of sodium hydroxide, 2.66g (0.01mol) of tetrapropylammonium bromide and 100ml of water to form A liquid, and 1.32g of aluminum sulfate ( 2mmol), 1.5ml of 70wt% concentrated sulfuric acid, 0.6g of polyaniline and 10ml of water were mixed evenly to form A solution, with a pH value of 0-1;

[0031] (2) Add liquid B dropwise to liquid A under stirring, stir at room temperature for 3 hours to make a uniform gel; put the reaction mixture into a synthesis reactor, age at 60°C for 4 hours, and crystallize at 160°C For 48h, make it crystallize under static condition;

[0032] (3) After the crystallization is complete, the product is centrifuged, washed with deionized water until the pH is 9-10, dried at 110°C, and roasted at 500°C for 3 hours to remove tetrapropylammonium bromide and polyaniline, thereby obtaining the average Grain diameter 2.5μm, SiO 2 / Al 2 o 3 ZSM-5 molecular sieve catalyst B with hierarchical poro...

Embodiment 3

[0034] (1) Mix 7.80g (0.1mol) of silicic acid, 2.50g (0.0625mol) of sodium hydroxide, 2.66g (0.01mol) of tetrapropylammonium bromide and 100ml of water to form B liquid, and 0.66g of aluminum sulfate ( 1mmol), 1ml of 95wt% concentrated sulfuric acid, 0.5g of polyaniline and 10ml of water were mixed evenly to form A solution, with a pH value of 0-1;

[0035](2) Add liquid B dropwise to liquid A under stirring, stir at room temperature for 3 hours to make a uniform gel; put the reaction mixture into a synthesis reactor, age at 60°C for 3 hours, and crystallize at 170°C 24h to make it crystallize under static;

[0036] (3) After the crystallization is complete, the product is centrifuged, washed with deionized water until the pH is 9-10, dried at 110°C, and roasted at 500°C for 4 hours to remove tetrapropylammonium bromide and polyaniline, thereby obtaining the average Grain diameter 2.8μm, SiO 2 / Al 2 o 3 Mole ratio of 100 ZSM-5 hierarchical porous structure molecular sieve ...

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Abstract

The invention discloses a multistage pore-structure molecular sieve, particularly discloses a ZSM-5 zeolite molecular sieve catalyst, relating to the field of inorganic materials and catalysts. The ZSM-5 type zeolite molecular sieve has grain size between 0.1 micrometer and 20 micrometers and comprises a microcellular structure and a mesoporous structure, wherein the microcellular structure has the aperture of 0.5-2 nanometers, and the mesoporous structure has the aperture of 2-15 nanometers; and the mole ratio of SiO2 / Al2O3 is 30-500. A preparation method comprises the following steps of: directly adding a high molecular polymer polyaniline to a molecular sieve original solution by taking an organic template agent tetrapropylammonium bromide, silicic acids and aluminum salt as raw materials; synthesizing the ZSM-5 zeolite molecular sieve by adopting a hydro-thermal method; crystallizing, and then baking to remove the organic template agent and the polyaniline.

Description

technical field [0001] The invention relates to the field of inorganic materials and catalysts, in particular to a nanometer molecular sieve catalyst with hierarchical pore structure and a preparation method thereof. Background technique [0002] In 1972, scientists Argauer and Landelt of Mobil Corporation of the United States used tetrapropylamine (Pr 4 NCl or Pr 4 NOH) as a templating agent in Na 2 O: Al 2 o 3 :24.2SiO2 2 :14.4Pr 4 OH:410H 2 The first important member of the "Pentasil" family, ZSM-5, was crystallized at 120°C in the O system. Because ZSM-5 molecular sieve has a unique microporous structure, unique shape selectivity, high silicon-aluminum ratio, and lipophilic and hydrophobic characteristics, as well as thermal stability and high catalytic activity, ZSM-5 molecular sieve has become the most One of the important molecular sieve catalytic materials, it is widely used in catalytic fields such as petroleum processing, coal chemical industry and fine che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J35/10C07C15/073C07C2/66
Inventor 郭亚军郭亚平郭丽华王海瑾褚联峰郭翠香
Owner SHANGHAI NORMAL UNIVERSITY
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