A kind of low-silicon multi-level structure ZSM-5 zeolite molecular sieve and its preparation method and application

A technology of ZSM-5 and zeolite molecular sieve, which is applied in borocarbane silicone crystalline aluminum silicate zeolite, molecular sieve catalyst, crystalline aluminosilicate zeolite, etc., can solve the problem of increasing the crystallization speed of molecular sieve and molecular sieve without multi-level structure and other problems, to achieve excellent mass transfer and diffusion properties, excellent diffusivity and reactivity, and time-saving effects

Active Publication Date: 2019-11-26
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because a higher alkalinity is required to dissolve the silicon source and aluminum source at a low silicon-aluminum ratio, and the crystallization rate of the molecular sieve will be greatly increased at a high alkalinity, so that the synthesized low-silicon-aluminum ratio molecular sieve does not have a multi-level structure

Method used

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  • A kind of low-silicon multi-level structure ZSM-5 zeolite molecular sieve and its preparation method and application
  • A kind of low-silicon multi-level structure ZSM-5 zeolite molecular sieve and its preparation method and application
  • A kind of low-silicon multi-level structure ZSM-5 zeolite molecular sieve and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Preparation of low-silicon multi-level structure ZSM-5 zeolite molecular sieve

[0043] (1) Raw material configuration: Take 4g tetrapropylammonium bromide (0.0150mol, equivalent to 0.120 times of coarse-pore silica gel) and 1.0g sodium hydroxide (0.025mol, equivalent to 0.2 times of coarse-pore silica gel) and add them to 18.75 g water (1.042mol, equivalent to 8.33 times that of coarse-porous silica gel), stir for 5-10min to dissolve and add 2.04g aluminum isopropoxide (0.005mol Al 2 o 3 , which is equivalent to 0.04 times that of coarse-pore silica gel), continue to stir for 10-50min until the solution is clear (pH value is about 13.2), and the solution is divided into two parts according to the mass fraction of 80% and 20%, wherein after 80% of the solution Slowly add 7.5 g (0.125 mol) of coarse-porous silica gel and stir at a constant speed for 3 h, then age at 40° C. for 6 h.

[0044] Introduction of seed crystals: the seed crystals are ZSM-5 zeolite w...

Embodiment 2

[0048] Example 2: Preparation of low-silicon multi-level structure ZSM-5 zeolite molecular sieve (without introducing crystal seeds)

[0049] (1) Raw material configuration: Take 3g of tetrapropylammonium bromide (0.0113mol, equivalent to 0.09 times of coarse-pore silica gel) and 0.9g of sodium hydroxide (0.0225mol, equivalent to 0.18 times of coarse-pore silica gel) and add them to 18.75 g water (1.042mol, equivalent to 8.33 times of coarse-porous silica gel), stir for 5-10min to dissolve, then add 0.1195g pseudo-boehmite (0.0015625mol Al 2 o 3 , equivalent to 0.0125 times that of coarse-pore silica gel), continue to stir for 10-50min until the solution is clear (pH value is about 13.2), the solution is divided into two parts according to the mass fraction of 80% and 20%, wherein after 80% of the solution Slowly add 7.5g (0.125mol) of coarse-porous silica gel and stir at a constant speed for 3h, then age at 90°C for 1h; then add another 20% solution, stir for 1h, and age at ...

Embodiment 3

[0053] Example 3: Preparation of low-silicon multi-level structure ZSM-5 zeolite molecular sieve

[0054] (1) Raw material configuration: Take 0.765g pseudoboehmite (0.005mol, equivalent to 0.04 times of coarse-pore silica gel) and add it to 40g tetrapropylammonium hydroxide (mass fraction 25%) (tetrapropylammonium hydroxide 0.0491 mol, equivalent to 0.39 times of coarse-pore silica gel; water 1.667mol, equivalent to 13.336 times of coarse-pore silica gel) stirred until the solution was clear, and the solution was divided into two parts according to the mass fraction of 80% and 20%, wherein 80% of the solution Then slowly add 7.5 g (0.125 mol) of coarse-porous silica gel and stir at a constant speed for 3 h, then age at 40° C. for 6 h.

[0055] Introduction of seed crystals: the seed crystals are ZSM-5 zeolite with a silicon-aluminum ratio of 25, the amount of which is 0.01 g, which is dissolved in the 20% aluminum source solution formed in step (1), and the pH value is adjust...

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Abstract

The invention relates to a low-silicon multistage structure ZSM-5 zeolite molecular sieve, and a preparation method and application thereof. The low-silicon multistage structure ZSM-5 zeolite molecular sieve is provided with a micropore-mesoporous multistage structure, wherein a one-time particle size is smaller than 300nm, and a secondary accumulation particle size is 300nm-4mu m; the silica-alumina ratio of the ZSM-5 zeolite molecular sieve is 10-80, the outer superficial area is greater than 100m<2> / g, mesoporous volume is not smaller than 0.1cm<3> / g, and total acid content is greater than1.5mmol / g. The low-silicon multistage structure ZSM-5 zeolite molecular sieve is high in acid content and reaction activity, more mesoporouses enable a reactant or products to be quickly diffused, side reaction and carbon deposition generation can be reduced, the carbon containing ability of the molecular sieve is increased, and the service life of the molecular sieve is prolonged.

Description

technical field [0001] The invention relates to a zeolite molecular sieve, in particular to a low-silicon multi-level structure ZSM-5 zeolite molecular sieve and a hydrothermal synthesis method and application thereof. Background technique [0002] ZSM-5 zeolite is a zeolite molecular sieve with a unique pore structure and strong acidity. Its pore structure is a multi-dimensional structure of straight-through and sinusoidal crossing. It has high hydrothermal stability and lipophilic and hydrophobic properties. Widely used in catalytic cracking, alkylation, isomerization, aromatization and other organic reactions. [0003] The traditional ZSM-5 zeolite only has micropores, which greatly limits the mass transfer and diffusion in the catalytic process. Although small-grain molecular sieves have good mass transfer and diffusion properties, it is difficult to separate small-grain molecular sieves from mother liquor during industrial production, which is not conducive to industri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/40B01J29/40
CPCB01J29/40C01B39/40C01P2002/72C01P2004/03
Inventor 吴志杰潘涛张城纲徐可窦涛
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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