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Method for modifying titanium silicon molecular sieve

A titanium-silicon molecular sieve and modification technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problem of less than 1% improvement, and achieve the effects of easy control of the process, improved catalytic oxidation activity, and simple and easy operation

Inactive Publication Date: 2009-12-02
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Lu et al. (Catal.Today, 93~95 (2004) p353~357) used certain concentrations of KAc, NaAc, NH 4 Ac, NH 4 Cl and HNO 3 The solution was processed at 80°C to remove the TS-1 after the template agent was roasted, but it was found that only part of the non-framework Ti species was removed, and there were still non-framework Ti species in the product, and the treated TS-1 product The phenol hydroxylation activity of the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] According to the literature (Chemistry Letters, 2000:774), the titanium silicate molecular sieve Ti-MWW was synthesized.

[0025] In the first step, the weight ratio of titanium silicon molecular sieve: fluorine-containing compound: acid: water = 1:0.03:10:50, the fluorine-containing compound is ammonium fluoride, and the acid is nitric acid; in the second step, the product is prepared in the first step The reaction mixture was reacted at 103°C for 20 hours, and then filtered, washed, dried and calcined to obtain a modified Ti-MWW molecular sieve product.

Embodiment 2

[0027] The implementation process is the same as in Example 1 except for the following differences:

[0028] In the first step, the weight ratio of titanium silicon molecular sieve: fluorine-containing compound: acid: water = 1:0.005:8:40, and the acid is sulfuric acid; in the second step, the reaction mixture prepared in the first step is reacted at 103°C for 15 After hours, the modified Ti-MWW molecular sieve product is obtained.

Embodiment 3

[0030] The implementation process is the same as in Example 1 except for the following differences:

[0031] In the first step, the weight ratio of titanium silicon molecular sieve: fluorine-containing compound: acid: water = 1:0.05:5:30; in the second step, the reaction mixture prepared in the first step is reacted at 103°C for 18 hours to obtain a modified Ti-MWW molecular sieve product after sex.

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Abstract

The invention discloses a method for modifying a titanium silicon molecular sieve, which comprises the following steps: evenly mixing the titanium silicon molecular sieve, fluorine-containing compounds, acid and water to form a reaction mixture, reacting the reaction mixture for 5 to 20 hours at the temperature of between 70 and 110 DEG C, and filtering, washing, drying and roasting the reaction product to obtain the modified titanium silicon molecular sieve. The method can effectively and selectively remove non-framework Ti species in the titanium silicon molecular sieve and change the hydrophilicity and hydrophobicity on the surface of the titanium silicon molecular sieve at the same time, and the catalytic oxidation activity of the obtained modified titanium silicon molecular sieve is greatly increased.

Description

Technical field [0001] The invention relates to the technical field of inorganic chemical synthesis, in particular to a modification method of titanium silicon molecular sieve. Background technique [0002] Titanium-silicon molecular sieve is to introduce transition metal titanium atoms into the molecular sieve framework with a certain topological structure to form a porous crystalline material with catalytic oxidation activity. Using titanium-silica molecular sieve as catalyst and dilute H 2 O 2 It is a mild reaction system formed by oxidants. It exhibits high activity and selectivity in organic oxidation reactions such as olefin epoxidation, aromatic hydroxylation, ketone ammoximation, alkane oxidation and alcohol oxidation. The by-product is only water. The environmentally friendly green chemical process has attracted widespread attention. Currently, TS-1 and Ti-MWW have been industrialized and have broad application prospects. TS-1 is a titanium silicate molecular sieve with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02
Inventor 刘月明杨俊霞谢伟郑玉婷吴鹏何鸣元
Owner EAST CHINA NORMAL UNIV
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