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Method for adjusting surface hole diameter of ZSM-5 molecular sieve by surface dealuminizing and compensating silicon

A ZSM-5, zeolite molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc., can solve the problem of high dealumination speed, and achieve low energy consumption, economical and effective , economical and reasonable effect

Inactive Publication Date: 2010-10-13
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But, because the framework silicon aluminum of X, Y zeolite is relatively low, easily cause the speed of dealumination to be greater than the speed of silicon supplementation, thereby cause the dealumination of molecular sieve framework to generate mesopore (R.Levanmao, N.T.C.Vo.Journal of Porous Materials.1995, 1 , 175)

Method used

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  • Method for adjusting surface hole diameter of ZSM-5 molecular sieve by surface dealuminizing and compensating silicon
  • Method for adjusting surface hole diameter of ZSM-5 molecular sieve by surface dealuminizing and compensating silicon
  • Method for adjusting surface hole diameter of ZSM-5 molecular sieve by surface dealuminizing and compensating silicon

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Embodiment 1

[0031] Mix 0.748g sodium hydroxide, 0.197g sodium metaaluminate, 2.66g tetrapropylammonium bromide, 6g white carbon black and 72g distilled water, stir evenly at room temperature and age for 45 minutes, then transfer the mixture into tetrafluoroethylene In the reaction kettle, place the reaction kettle in an oven at 180°C, let it stand for crystallization for 2 days, filter the product and wash it with distilled water to obtain ZSM-5 zeolite molecular sieve A 1 .

Embodiment 2

[0033] Mix 29.719g of tetrapropylammonium hydroxide, 0.75g of sodium metaaluminate, 22g of white carbon black and 43.598g of distilled water, stir evenly at room temperature and age for 7 hours, then transfer the mixed solution into a tetrafluoroethylene reactor, and The reaction kettle was placed in an oven at 180°C, left to stand for crystallization for 5 days, the product was filtered and washed with distilled water to obtain ZSM-5 zeolite molecular sieve A 2 .

Embodiment 3-4

[0035] With the method identical with embodiment 2, just change white carbon black into 38.43g and 60.397g respectively, obtain ZSM-5 zeolite molecular sieve A respectively 3 and A 4 .

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Abstract

The invention belongs to the technical field of zeolite molecular sieves, in particular to a method for adjusting a surface hole diameter of a ZSM-5 molecular sieve by surface dealuminizing and compensating silicon. The invention accurately controls the surface hole diameter of the molecular sieve by using the treating measure of dealuminizing and compensating silicon on the ZSM-5 zeolite molecular sieve with ammonium fluosilicate solution. An ultrathin layer enriched with silicon is formed on the surface of the ZSM-5 zeolite molecular sieve treated by the method so that the hole caliber on the surface of the molecular sieve is shrunk. The ZSM-5 zeolite molecular sieves with different hole caliber shrinkage level can be selectively obtained by changing different treating conditions. The SM-5 zeolite molecular sieves modified by the method can be used for absorbing a mixture of three isomerides of P-, M-and O-Xylene.

Description

technical field [0001] The invention belongs to the technical field of zeolite molecular sieves, and in particular relates to a method for adjusting the surface aperture of a ZSM-5 zeolite molecular sieve by adopting a surface dealumination method of ammonium fluorosilicate and supplementing silicon. Background technique [0002] Xylene is C 8 The main components of the distillate include three isomers of o-xylene (OX), p-xylene (PX) and m-xylene (MX). As important chemical raw materials, they are widely used in industrial production. Ortho-xylene is the key raw material for the synthesis of phthalic anhydride, o-toluic acid, phthalonitrile and other resins and various organic products; p-xylene is the key raw material for the synthesis of terephthalic acid or dimethyl terephthalate The main raw material of polyester products such as xylene; m-xylene is mainly used to synthesize isophthalic acid, trimellitic anhydride, etc. to prepare unsaturated polyester resins, plasticiz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/38
Inventor 唐颐宋燕梅任楠
Owner FUDAN UNIV
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