Method of synthesizing Ti-MWW molecular sieve

A synthesis method and technology of molecular sieves, applied in the direction of molecular sieve compounds, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of unfavorable industrial production and application of molecular sieves, complex process of titanium-silicon molecular sieves, long process flow, etc., so as to facilitate industrial production and application, low cost and simplified operation process

Inactive Publication Date: 2005-10-26
EAST CHINA NORMAL UNIVERSITY
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Problems solved by technology

The feature of the titanosilicate is that its structural formula is: xTiO 2 ·(1-x)SiO2 2 ; X-ray diffraction spectrum of molecular sieve with MWW structure; its preparation process is, the first step, hydrothermal crystallization to prepare the MWW structure precursor containing silicon and boron, the second step, acid treatment the MWW structure precursor obtained in the previous step In the third step, the product obtained in the previous step is subjected to hydrothermal crystallization treatment together with the titanium source an

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  • Method of synthesizing Ti-MWW molecular sieve

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Embodiment 1

[0035] The first step is to prepare Ti-MWW molecular sieve raw powder

[0036] TiO in molar ratio titanium source 2 : SiO in silicon source 2 : B in boron source 2 o 3: F in fluorine source - : organic templating agent: H 2 O is 0.033:1:0.67:1:1.4:19 to prepare the reaction mixture, the titanium source is tetrabutyl titanate, the silicon source is silica gel, the boron source is boric acid, and the fluorine source is HF, the organic template is piperidine, and the reaction mixture is hydrothermally crystallized at 170°C for 7 days, filtered, washed, and dried to obtain the original powder of Ti-MWW molecular sieve;

[0037] The second step acid treatment

[0038] The Ti-MWW molecular sieve raw powder obtained in the first step and the nitric acid solution with a concentration of 2 mol / l are prepared as a reaction mixture according to a weight ratio of 1:50, treated at 100°C for 20 hours, filtered, washed, and dried to obtain an acid-treated product ;

[0039] The third...

Embodiment 2～8

[0043] Implementation process is except following difference, and all the other are all the same with embodiment 1:

[0044] The first step is to prepare Ti-MWW molecular sieve raw powder

[0045] The molar ratio composition of the reaction mixture:

Embodiment 2

[0046] Example 2 0.10TiO 2 : SiO 2 : 0.67B 2 o 3 :0F - : 1.4 organic templating agent: 19H 2 O;

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Abstract

The present invention relates to a synthesis method of Ti-MWW molecular sieve. Said method includes the following steps: uniformly mixing silicon source, titanium source, boron source, template agent, fluorine source and water to obtain colloidal material, them making hydrothermal crystallization so as to obtain Ti-MWW molecular sieve raw material powder, making said raw material powder reacte with acidic solution, roasting so as to obtain the Ti-MWW molecular sieve.

Description

technical field [0001] The invention relates to a synthesis method of Ti-MWW molecular sieve, which 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 components, have been industrialized in the process of alkylation of olefins and benzene. [0003...

Claims

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Application Information

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IPC IPC(8): C01B37/00
Inventor 刘月明汪玲玲吴海虹吴鹏何鸣元
Owner EAST CHINA NORMAL UNIVERSITY
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