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A kind of multi-level structure zsm-5 zeolite molecular sieve and its synthesis method and application

A zeolite molecular sieve, ZSM-5 technology, applied in the direction of molecular sieve catalyst, crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc., can solve the problem of limiting the range of the silicon-aluminum ratio of ZSM-5 molecular sieve, etc., Achieve the effect of improving diffusion performance and catalyst activity, reducing the possibility of side reactions and carbon deposition, and reducing the rate of depolymerization

Active Publication Date: 2019-06-14
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to add a large number of ZSM-12 molecular sieve seeds, and all the aluminum sources required for the synthesis of ZSM-5 come from ZSM-12, which limits the control of the range of silicon-aluminum ratio of ZSM-5 molecular sieve

Method used

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  • A kind of multi-level structure zsm-5 zeolite molecular sieve and its synthesis method and application
  • A kind of multi-level structure zsm-5 zeolite molecular sieve and its synthesis method and application
  • A kind of multi-level structure zsm-5 zeolite molecular sieve and its synthesis method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: the preparation of ZSM-5 zeolite molecular sieve

[0045] (1) Coarse-porous silica gel preparation and aging:

[0046] Add 3 grams of tetrapropylammonium bromide (0.011278195 mol equivalent to 0.09022556 times that of coarse-pore silica gel) into 5 grams of deionized water (0.277777778 mol equivalent to 2.222222222 times that of coarse-pore silica gel), stir and disperse to obtain a template solution ;

[0047] Add 5 grams of deionized water (0.277777778mol is equivalent to 2.222222222 times that of coarse-pore silica gel) into 7.5 grams of coarse-pore silica gel (0.125mol), stir, and then add template agent solution dropwise to the silicon source solution, after stirring for 4 hours, then Aged at 50°C for 6 hours. Take 0.5 g of sodium hydroxide (0.0125 mol is equivalent to 0.1 times of coarse-pore silica gel) and add it to 5 g of deionized water (0.277777778 mol is equivalent to 2.222222222 times of coarse-pore silica gel), then add the above solution d...

Embodiment 2

[0054] Embodiment 2: the preparation of ZSM-5 zeolite molecular sieve containing Ti

[0055] (1) Coarse-porous silica gel preparation and aging:

[0056] Add 3 grams of tetrapropylammonium bromide (0.011278195 mol equivalent to 0.09022556 times that of coarse-pore silica gel) into 10 grams of deionized water (0.555555556 mol equivalent to 4.444444444 times that of coarse-pore silica gel), stir and disperse to obtain a template solution ;

[0057] Add 5 grams of deionized water (0.277777778mol is equivalent to 2.222222222 times that of coarse-pore silica gel) into 7.5 grams of coarse-pore silica gel (0.125mol), stir, and then add template agent solution dropwise to the silicon source solution, after stirring for 4 hours, then Aged at 40°C for 12 hours. Take 0.5 g of sodium hydroxide (0.0125 mol equivalent to 0.1 times that of coarse-pore silica gel) and 0.2 g of sodium bromide (0.001941748 mol equivalent to 0.015533981 times that of coarse-pore silica gel) and add them to 5 g...

Embodiment 3

[0062] Embodiment 3: the preparation of ZSM-5 zeolite molecular sieve

[0063] (1) Coarse-porous silica gel preparation and aging:

[0064] Add 3 grams of tetrapropylammonium bromide (0.011278195 mol equivalent to 0.09022556 times that of coarse-pore silica gel) into 5 grams of deionized water (0.277777778 mol equivalent to 2.222222222 times that of coarse-pore silica gel), stir and disperse to obtain a template solution;

[0065] Add 5 grams of deionized water (0.277777778mol equivalent to 2.222222222 times that of coarse-pored silica gel) into 7.5 grams of coarse-pored silica gel (0.125mol), stir, then add template solution dropwise to the silicon source solution, and after stirring for 4 hours, Then aged at 70°C for 4 hours. Take 0.675 grams of sodium hydroxide (0.016875 mol equivalent to 0.135 times of coarse-pore silica gel) and add it to 5 grams of deionized water (0.277777778 mol equivalent to 2.222222222 times of coarse-pore silica gel), then add the above solution d...

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Abstract

The invention relates to a method for synthesizing a multi-level structure ZSM-5 zeolite molecular sieve with intracrystalline mesopores and intercrystalline mesopores and its synthesis method and application. In addition to the micropores of the zeolite structure, the multi-level structure ZSM-5 zeolite molecular sieve also has inter-crystalline mesopores and intra-crystalline mesopore structures, in which the primary nanocrystal particle size is 40-500nm and the secondary accumulation particle size is 500nm-5μm. This structure greatly improves the diffusion performance and catalyst activity of the molecular sieve, reduces the possibility of side reactions and carbon deposition, increases the carbon holding capacity of the molecular sieve catalyst, and extends the catalyst life.

Description

technical field [0001] The invention relates to a zeolite molecular sieve, in particular to a ZSM-5 zeolite molecular sieve with a multi-level structure containing intercrystalline mesopores and intracrystalline mesopores, and a synthesis method and application thereof. Background technique [0002] ZSM-5 molecular sieve is a medium-pore zeolite with a pore size of about 0.6nm, which has high hydrothermal stability and lipophilic and hydrophobic capabilities. As a good shape-selective catalyst, ZSM-5 has been widely used in petroleum refining and petrochemical industries. [0003] For molecular sieve catalysts, the size of molecular sieve crystals affects the diffusion and reactivity of reactant molecules in molecular sieve crystals. However, ZSM-5 only has micropores, which greatly limits the mass transfer and diffusion problems in the catalytic process, and because the small-grained molecular sieve particles are small, it is difficult to separate the molecular sieve produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/40C01B39/38B01J29/40B01J29/88B01J29/89C07C1/20C07C11/06C07C249/04C07C251/44C07C45/39C07C49/17
CPCC01B39/38C01B39/40C07C1/20C07C45/39C07C249/04B01J29/40B01J29/88B01J29/89C01P2004/03C01P2004/04C01P2002/72C01P2004/62C01P2004/61C01P2006/12C01P2006/14B01J2229/183B01J35/40C07C11/06C07C251/44C07C49/17Y02P20/52
Inventor 吴志杰赵凯强潘涛张敏窦涛
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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