Method for synthesizing alkali modified molecular sieve containing titanium

A technology of titanium molecular sieve and synthesis method, which is applied in the synthesis of titanium-containing molecular sieve and the synthesis field of Ti-MWW molecular sieve, can solve the problem of low stability of catalytic activity of Ti-MWW molecular sieve, and achieves simple operation and stable catalytic activity. Improve the effect of easy process control

Inactive Publication Date: 2009-02-11
EAST CHINA NORMAL UNIV
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Problems solved by technology

[0005] In order to solve the problem of low catalytic activity and stability of existing Ti-MWW molecular sieves, the present invention proposes a synthesis method of alkali-modified titanium-containing molecular sieves

Method used

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  • Method for synthesizing alkali modified molecular sieve containing titanium

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Embodiment 1

[0020] According to the literature (Chemistry Letters, 2000: 774), SiO is composed of sol 2 / TiO 2 Ti-MWW molecular sieves were synthesized with a molar ratio of 20 as raw materials.

[0021] In the first step, Ti-MWW molecular sieve: the weight ratio of basic compound solution=1:5, the concentration of basic compound solution is 5.6mol / l, and basic compound is piperidine; In the second step, hydrothermal treatment first The temperature and time of the reaction mixture prepared in this step were 170°C and 24 hours, respectively.

Embodiment 2

[0023] Implementation process is except following difference, and all the other are all the same with embodiment 1:

[0024] In the first step, the basic compound is hexamethyleneimine.

Embodiment 3

[0026] Implementation process is except following difference, and all the other are all the same with embodiment 1:

[0027] In the first step, the basic compound is a mixture of piperidine and hexamethyleneimine, and the weight ratio of the two is 1:1.

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Abstract

This invention relates to a method for synthesizing alkali-modified Ti-containing molecular sieve, more specifically, alkali-modified Ti-MWW molecular sieve. Ti-MWW molecular sieve synthesized by the present method has the problem of low catalytic activity during utilization. The method in this invention comprises: mixing Ti-MWW molecular sieve with alkaline compound solution, performing alkali modification treatment at 120-200 deg.C, filtering, washing, drying and torrefying to obtain alkali-modified Ti-MWW molecular sieve. The method has such advantages as easy operation and high process controllability. The synthesized alkali-modified Ti-MWW molecular sieve has such advantages as high catalytic activity and high stability.

Description

technical field [0001] The invention relates to a method for synthesizing an alkali-modified titanium-containing molecular sieve, to be precise, a method for synthesizing an alkali-modified Ti-MWW molecular sieve, and belongs to the technical field of inorganic chemical synthesis. Background technique [0002] Molecular sieves with MWW structure are a class of molecular sieves with sinusoidal 10-membered ring network pore system, 12-membered ring cavity and supercage pore system structure (Science, 1994, 264: 1910). The catalytically active aluminum atoms are introduced into the framework of MWW molecular sieves to form MCM-22 molecular sieves (US4,954,325). Due to the special pore structure, as an acidic catalytic active component, MCM-22 molecular sieve exhibits excellent catalytic properties such as catalytic cracking (US 4,983,276), olefin and benzene alkylation (US 4,992,606, US 4,992,615, US 5,334,795). Molecular sieves with MWW structure, as acidic catalytic active c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/06C01B39/48B01J29/89
Inventor 刘月明汪玲玲谢伟吴鹏何鸣元
Owner EAST CHINA NORMAL UNIV
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