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Preparation method and application of modified ZSM-22 molecular sieve

A technology of ZSM-22 and molecular sieves, applied in the field of molecular sieves, to achieve strong adsorption, enhanced structural strength, and improved stability

Inactive Publication Date: 2019-10-15
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of how ZSM-22 molecular sieve is suitable for the field of VOCs adsorption, especially the adsorption of toluene, a preparation method and application of modified ZSM-22 molecular sieve are provided

Method used

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  • Preparation method and application of modified ZSM-22 molecular sieve
  • Preparation method and application of modified ZSM-22 molecular sieve
  • Preparation method and application of modified ZSM-22 molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A preparation method of modified ZSM-22 molecular sieve, comprising the steps of:

[0022] (1) According to the molar ratio of SiO 2 :Al 2 o 3 : Template agent: OH – : distilled water=1:0.01:0.2:0.2:10, 32.48g hexamethyldisiloxane, 0.375g aluminum nitrate, 7.69g cetylpyridinium bromide, 1.13g potassium hydroxide and 18mL distilled water were mixed and stirred, After the gel-like mixture was formed, the mixture was transferred to a stainless steel reactor with a polytetrafluoroethylene lining, and placed in an oven at 160°C for crystallization reaction for 72 hours to obtain a precursor, which was separated and cleaned to medium properties, dried at 90°C, and then baked in a muffle furnace at 3°C ​​min -1 The heating rate was raised from room temperature to 500°C, and roasted at constant temperature for 8 hours to obtain ZSM-22 molecular sieve;

[0023] (2) Disperse 1g of ZSM-22 molecular sieve in 5mL of butyl titanate, dry it at 80°C and roast it in a muffle furnac...

Embodiment 2

[0025] A preparation method of modified ZSM-22 molecular sieve, comprising the steps of:

[0026] (1) According to the molar ratio of SiO 2 :Al 2 o 3 : Template agent: OH – : Distilled water=1:0.02:0.4:0.3:20, 16.24g hexamethyldisiloxane, 0.75g aluminum nitrate, 7.68g cetylpyridinium bromide, 0.842g potassium hydroxide and 18mL distilled water were mixed and stirred, After the gel-like mixture was formed, the mixture was transferred to a stainless steel reaction kettle with a polytetrafluoroethylene liner, and placed in an oven at 165°C for crystallization reaction for 48 hours to obtain a precursor, which was separated and cleaned to medium properties, dried at 90°C, and then baked in a muffle furnace at 3°C ​​min -1 The heating rate was increased from 20°C to 550°C, and the constant temperature was roasted for 8 hours to obtain ZSM-22 molecular sieve;

[0027] (2) Disperse 1g of ZSM-22 molecular sieve in 10mL of butyl titanate, dry it at 80°C and roast it in a muffle fu...

Embodiment 3

[0029] A preparation method of modified ZSM-22 molecular sieve, comprising the steps of:

[0030] (1) According to the molar ratio of SiO 2 :Al 2 o 3 : Template agent: OH – : distilled water=1:0.03:0.6:0.4:30, 32.48 hexamethyldisiloxane, 2.25g aluminum nitrate, 23.07g cetylpyridinium bromide, 1.48g calcium hydroxide and 54mL distilled water are mixed and stirred, and After the gel-like mixture is formed, the mixture is transferred to a stainless steel reaction kettle with a polytetrafluoroethylene liner, and placed in an oven at 170 ° C for crystallization reaction for 72 hours to obtain a precursor, which is separated and cleaned to neutral , dried at 90°C, and then baked in a muffle furnace at 3°C ​​min -1 The heating rate was increased from 30°C to 600°C, and the constant temperature was roasted for 9 hours to obtain ZSM-22 molecular sieve;

[0031] (2) Disperse 1g of ZSM-22 molecular sieve in 15mL of butyl titanate, dry it at 80°C and roast it in a muffle furnace, and...

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Abstract

The invention relates to a preparation method and application of a modified ZSM-22 molecular sieve. According to the preparation method, a suitable silicon source, an aluminum source and a template agent are selected, preparation parameters are debugged without adding seed crystals, and a relatively pure ZSM-22 molecular sieve is prepared with a static hydrothermal synthesis method; and the titanium-loaded modified ZSM-22 molecular sieve is prepared by dispersing the ZSM-22 molecular sieve in butyl titanate, drying and calcining; the modified ZSM-22 molecular sieve provided by the invention has stronger adsorption than that of a unmodified ZSM-22 molecular sieve, and has relatively strong adsorption effect on toluene with low, medium and high concentrations, and the adsorption rate on toluene is as high as 98% or more.

Description

technical field [0001] The invention relates to the technical field of molecular sieves, in particular to a preparation method and application of a modified ZSM-22 molecular sieve. Background technique [0002] ZSM-22 molecular sieve is a high-silica zeolite molecular sieve synthesized by Mobil Corporation of the United States under a hydrothermal system. It belongs to the topological framework of the TON structure. The skeleton topology of ZSM-22 includes five-membered rings, six-membered rings and ten-membered rings. , its channel structure is a one-dimensional linear ten-membered ring elliptical channel without intersecting channels, and its pore diameter is 47nm×0.55nm, which is slightly smaller than the ZSM-5 ten-membered ring channel hole (0.53nm×0.56nm). Due to its unique structure , with medium-strength surface acidity and high molecular selectivity, so that it has strong catalytic performance in the isomerization of straight-chain hydrocarbons, such as catalytic dew...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/48B01J20/18
CPCB01J20/186C01B39/026C01B39/48C01P2002/72
Inventor 朱博文郑纯智尤惠张国华翁居轼姚鹏飞
Owner JIANGSU UNIV OF TECH
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