Preparation method of Ti-MWW molecular sieve

A technology of molecular sieve and silicon source, which is applied in the direction of crystalline aluminosilicate zeolite, etc., to achieve the effects of improved catalytic activity, short production process and low cost

Inactive Publication Date: 2007-08-08
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In summary, so far, no literature has reported the method of improving the catalytic activity of MWW-structured Ti-Si molecular sieves by introducing surfactants during the crystallization process.

Method used

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  • Preparation method of Ti-MWW molecular sieve

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Embodiment 1

[0027] In the first step, the TiO in the titanium source 2 : SiO in silicon source 2 : B in boron source 2 o 3 : F in fluorine source - : organic templating agent: H 2 The molar ratio of O is 0.033:1:0.67:1:1.4:19, surfactant: SiO in silicon source 2 The weight ratio is 0.015:1, the titanium source is tetrabutyl titanate, the silicon source is silica gel, the boron source is boric acid, the fluorine source is HF, the organic template agent is piperidine, and the surfactant is alkyl quaternary ammonium salt cation Surfactant hexadecyltrimethylammonium bromide, the mixture was hydrothermally crystallized at 170°C for 7 days, filtered, washed, and dried to obtain the original powder of Ti-MWW molecular sieve; in the first step', the first step obtained The original powder of Ti-MWW molecular sieve and the concentration of 2mol / l nitric acid solution are 1:50 according to the weight ratio, and the reaction mixture is treated at 100°C for 20 hours, filtered, washed, and dried ...

Embodiment 2～8

[0030] Implementation process is except following difference, and all the other are all the same with embodiment 1:

Embodiment 2

[0031] In the first step of embodiment 2, molar ratio: 0.10TiO 2 : SiO 2 : 0.67B 2 o 3 :0F - : 1.4 organic templating agent: 19H 2 O, weight ratio:surfactant:SiO in silicon source 2 0.005:1, the mixture was hydrothermally crystallized at 130°C for 10 days; in the second step, the product obtained in the previous step was calcined at 600°C for 3 hours.

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Abstract

The invention discloses a making method of Ti-MWW molecular sieve in the inorganic chemical synthetic technical domain, which comprises the following steps: introducing surface activator in the crystallizing course of Ti-MWW molecular sieve; making raw powder of Ti-MWW molecular sieve; proceeding acid disposal; sintering; obtaining the product.

Description

technical field [0001] The invention relates to a preparation 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 hole 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 cracking (US 4,983,276), olefin and benzene alkylation (US4,992,606, US 4,992,615, US 5,3 34,795) and other catalytic performance. Molecular sieves with MWW structure, as acidic catalytic active components, have been industrialized in the process of alkylation of olefins and benzene. [0003] The transition ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04C01B39/08
Inventor 刘月明谢伟吴鹏何鸣元
Owner EAST CHINA NORMAL UNIV
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