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Method for preparing mesoporous titanium silicon molecular sieve nanoparticles

A titanium-silicon molecular sieve, nanoparticle technology, applied in molecular sieve catalysts, nanotechnology, chemical instruments and methods, etc., can solve the problems of limited application, catalytic performance can not be well exerted, and the contact frequency of reactants and reactive centers Low and other problems, to achieve the effect of reducing residence time, environmental pollution-free preparation cycle, and increasing effective collision frequency

Inactive Publication Date: 2014-06-11
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the particle size of the existing mesoporous titanium-silicon materials is mostly in the micron range. Due to the large particle size, the contact frequency between the reactant and the active center in the catalytic reaction is low, so that its catalytic performance cannot be achieved. well played, which limits its wider application

Method used

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  • Method for preparing mesoporous titanium silicon molecular sieve nanoparticles
  • Method for preparing mesoporous titanium silicon molecular sieve nanoparticles
  • Method for preparing mesoporous titanium silicon molecular sieve nanoparticles

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specific Embodiment approach 1

[0024] Embodiment 1: A method for preparing mesoporous titanium-silicon molecular sieve nanoparticles according to the present embodiment is carried out according to the following steps:

[0025] 1. Weigh tetraethyl orthosilicate, cetyltrimethylammonium bromide, deionized water, ammonia water and tetrabutyl titanate, hydrogen peroxide and polyquaternium-6 with a mass concentration of 25%, Among them, the molar ratio of ethyl orthosilicate to cetyltrimethylammonium bromide is 1:0.1~0.2, the molar ratio of ethyl orthosilicate to deionized water is 1:50~70, ethyl orthosilicate The mass ratio of ester to ammonia water with a mass concentration of 25% is 1:0.5~3, the molar ratio of ethyl orthosilicate to tetrabutyl titanate is 1:0.01~0.03, and the ratio of ethyl orthosilicate to hydrogen peroxide The molar ratio is 1:0~8, the mass ratio of polyquaternium-6 and cetyltrimethylammonium bromide is 1:0.04~5;

[0026] 2. Add cetyltrimethylammonium bromide, polyquaternium-6, and ammonia ...

specific Embodiment approach 2

[0031] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the molar ratio of ethyl orthosilicate and cetyltrimethylammonium bromide in step one is 1: 0.11~0.18, and ethyl orthosilicate and The molar ratio of deionized water is 1:55~65, the mass ratio of ethyl orthosilicate to ammonia water with a mass concentration of 25% is 1:1~2, and the molar ratio of ethyl orthosilicate to tetrabutyl titanate 1:0.015~0.25, the molar ratio of tetraethyl orthosilicate to hydrogen peroxide is 1:2~6, the mass ratio of polyquaternium-6 to cetyltrimethylammonium bromide is 1:0.05 ~4.5. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0032] Specific embodiment three: the difference between this embodiment and specific embodiment one is that the molar ratio of tetraethyl orthosilicate to hexadecyltrimethylammonium bromide in step one is 1:0.15, and tetraethyl orthosilicate and deionized The molar ratio of water is 1:60, the mass ratio of ethyl orthosilicate to ammonia water with a mass concentration of 25% is 1:1.2, the molar ratio of ethyl orthosilicate to tetrabutyl titanate is 1:0.1, and The molar ratio of ethyl silicate to hydrogen peroxide is 1:4, and the mass ratio of polyquaternium-6 to cetyltrimethylammonium bromide is 1:2. Others are the same as in the first embodiment.

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Abstract

The invention relates to a method for preparing mesoporous titanium silicon molecular sieve nanoparticles, aiming at solving the technical problem that the mesoporous titanium silicon material particles prepared by hydro-thermal synthesis are larger in size. The method comprises the steps of: sequentially adding hexadecyl trimethyl ammonium bromide (HTAB), polyquaternium-6 and ammonia water into deionized water, and evenly mixing to obtain a mixed solution; then, adding tetraethoxysilane and tetrabutyl titanate into the mixed solution dropwise, and continuously stirring to obtain precursor solution; carrying out hydrothermal treatment on the precursor solution, separating out solid phase substance, washing and drying; and finally, putting the dried solid phase substance in a muffle furnace for calcination to obtain the mesoporous titanium silicon molecular sieve nanoparticles. The mesoporous titanium silicon molecular sieve nanoparticles have the average size of less than 100nm, the mesoporous aperture of 2-3.5nm and the specific surface area of 300-850m<2> / g, and can be used for macromolecular catalytic fine chemical engineering and pharmaceutical synthesis fields.

Description

technical field [0001] The invention relates to a method for preparing a mesoporous titanium-silicon molecular sieve. Background technique [0002] Since Mobil first developed the M41S series of materials in 1992, mesoporous SiO 2 Because of its regular pore channels, large specific surface area and adjustable pore size, it has broad application prospects in the fields of ion exchange, adsorption and separation, host-guest chemistry, and industrial catalysis, and has gradually become a research hotspot of mesoporous materials. A large number of studies have shown that the introduction of transition metal elements into mesoporous SiO 2 Mesoporous catalytic materials with high activity and high selectivity can be obtained in the skeleton. Among them, mesoporous titanium-silicon materials containing metal titanium have been the focus of research because of their unique properties in many catalytic reactions. [0003] Usually, mesoporous TiSi materials can be synthesized by h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/89C01B39/08B82Y40/00
Inventor 林凯峰赵勇姜艳秋许宪祝孙建敏张潇
Owner HARBIN INST OF TECH
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