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Method for synthesizing ZSM-5 zeolite orderly accumulated by nanometer crystallite

A technology of ZSM-5 and synthesis method, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problem of not many nano zeolites, achieve easy separation and recovery, and high yield , the effect of high crystallinity

Inactive Publication Date: 2011-03-09
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to synthesize ZSM-5 zeolite more easily and more controllably, people thought of adding seeds or inducers to the synthesis liquid in the 1990s, but there are not many nano zeolites synthesized by the seed crystal method

Method used

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  • Method for synthesizing ZSM-5 zeolite orderly accumulated by nanometer crystallite
  • Method for synthesizing ZSM-5 zeolite orderly accumulated by nanometer crystallite
  • Method for synthesizing ZSM-5 zeolite orderly accumulated by nanometer crystallite

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Add NaOH 1.1g, silica sol (SiO 2 40wt%) 11.3g and H 2 O 35.4g was made into A solution, and KF·2H was added 2 O 2.1g and H 2 O 8.0g is made into B solution, add TPABr 7.4g and H 2 O 12.0g to make C solution, add Al 2 (SO 4 ) 3 18H 2 O1.2g, H 2 O 27.9g and Na 2 SO 4 1.3g was formulated as D solution. Slowly add D to A with stirring, then B and C, and stir for 15 minutes. Then, add 5g of 5wt% 100nmS1 seed crystals, stir and age for 4 hours, and put it into a high-pressure stainless steel reactor containing a polytetrafluoroethylene liner for crystallization at 160-180°C for 20-30h. After the sample was cooled, it was washed with deionized water until neutral, dried at 100°C for 4 hours, and then heated to 550°C for 5 hours to remove the templating agent and roasted to obtain sample A. 1 .

Embodiment 2-4

[0036] Adopt the method consistent with embodiment 1, change seed crystal size, add respectively 200nm, 400nm, 600nm seed crystal, obtain A 2 、A 3 、A 4 .

Embodiment 5-8

[0038] Using the same method as in Example 1, just add 0.3g hexadecyltrimethylammonium bromide at the same time as the seed crystal, and add 100nm, 200nm, 400nm, 600nm seed crystals to obtain sample B respectively 1 , B 2 , B 3 , B 4 .

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Abstract

The invention belongs to the technical field of zeolite materials, in particular to a method for synthesizing ZSM-5 zeolite orderly accumulated by nanometer crystallite. The method comprises the following steps: adding MFI type zeolite seed crystal in a common ZSM-5 zeolite synthesizing solution; and synthesizing the ZSM-5 zeolite with multistage pore canals and controllable granular size by modulating the synthesizing ration, reaction condition or adding additives. In the invention, the ZSM-5 zeolite is an assembly body of a class of single crystals, which is grown by orderly packing seed crystals by ZSM-5 zeolite crystallite, has small granular and a multistage pore canal structure, larger surface area, shorter mass transfer route, good stability, and can be used for reactions for diffusion control or the surface activity site control. The method has short hydro-thermal treatment time, high crystallinity and yield and the like, and is convenient to separate the ZSM-5 zeolite.

Description

technical field [0001] The invention belongs to the technical field of zeolite materials, and in particular relates to a method for synthesizing ZSM-5 zeolite in which nano crystallites are ordered and stacked. Background technique [0002] Most of the zeolites commonly used by people are micron-sized. Compared with the traditional larger micron-sized zeolites, small-particle zeolites, especially nano-particle zeolite catalysts, have some advantages: (1) low diffusion resistance; High activity; (3) Large external area, strong carbon capacity. However, small-particle zeolites often also show some weaknesses: (1) poor hydrothermal stability, easy to destroy the skeleton, and easy loss of skeleton aluminum; (2) difficult to prepare and low yield; (3) difficult to separate and recover, and easy to agglomerate when roasted ( V.P. Valtchev et al, Microporous Mesopoous Mater. 2001, 43, 41). We tried to synthesize a special structured zeolite that has the advantages of nanoparticl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40
Inventor 唐颐张宏斌任楠
Owner FUDAN UNIV
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