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Synthesis of nano-ZSM-5 molecular sieve

A synthesis method, ZSM-5 technology, applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of increasing the complexity of the post-processing process after increasing the operation repeatability, and achieves industrialization Production and application, short production process, and the effect of high specific surface area

Inactive Publication Date: 2009-05-13
EAST CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to achieve the goal of nano-molecular sieve, in the above methods, the existing sol-gel synthetic molecular sieve system needs to be greatly adjusted, which increases the repeatability of the operation and the complexity of the post-processing process.

Method used

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  • Synthesis of nano-ZSM-5 molecular sieve

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In the first step, the molar ratio is Al in the aluminum source 2 o 3 : SiO in silicon source 2 : NaOH in alkali source: organic base: H 2 O is 0.025:1:0.12:0.4:12, the aluminum source is sodium metaaluminate, the silicon source is silica sol, the alkali source is sodium hydroxide, and the organic base is isopropylamine .

[0021] In the second step, hydrothermal crystallization was carried out at 170° C. for 3 days. The scanning electron micrograph picture of the obtained nanometer ZSM-5 molecular sieve is for reference figure 1 , in the figure: the molecular sieve grain shape is a rod-like structure, the average diameter of the grain section is about 90nm, and the length is about 400nm.

Embodiment 2

[0023] In the first step, the molar ratio is Al in the aluminum source 2 o 3 : SiO in silicon source 2 : NaOH in alkali source: organic base: H 2 O is 0.01:1:0.2:1.0:20, the aluminum source is sodium metaaluminate, the silicon source is silica sol, the alkali source is sodium hydroxide, and the organic base is isopropylamine .

[0024] In the second step, hydrothermal crystallization was carried out at 170° C. for 3 days. The scanning electron micrograph figure of the nano ZSM-5 molecular sieve that obtains and figure 1 Similarly, the average diameter of its grain cross-section is about 85 nm.

Embodiment 3

[0026] In the first step, the molar ratio is Al in the aluminum source 2 o 3 : SiO in silicon source 2 : NaOH in alkali source: organic base: H 2 O is 0.05:1:0.2:1.0:50, the aluminum source is sodium metaaluminate, the silicon source is silica sol, the alkali source is sodium hydroxide, and the organic base is isopropylamine .

[0027] In the second step, hydrothermal crystallization was carried out at 170° C. for 3 days. The scanning electron micrograph figure of the nano ZSM-5 molecular sieve that obtains and figure 1 Similarly, the average diameter of its grain cross-section is about 90 nm.

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Abstract

The invention discloses a method for synthesizing nanometer ZSM-5 molecular sieve, which belongs to the technical field of inorganic chemosynthesis. The method comprises steps as follows: sodium metaaluminate or aluminium sulphate, silica sol or water glass, sodium hydroxide and isopropylamine are prepared into reaction mixer; the reaction mixer is subjected to hydrothermal crystallization; and the reaction mixer after the hydrothermal crystallization is filtered, washed, dried and baked conventionally to obtain nanometer ZSM-5 molecular sieve. The synthesized ZSM-5 molecular sieve has the advantages of higher specific surface, short production flow and low cost, and the section of the synthesized ZSM-5 molecular sieve crystal grain has an average diameter not larger than 100 nm, thereby facilitating industrialization production and application.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical synthesis, in particular to a method for synthesizing nanometer ZSM-5 molecular sieves. Background technique [0002] ZSM-5 molecular sieve was synthesized for the first time in 1972 by American Mobil Company (US3,702,886). Because of its special pore structure and catalytic performance, excellent thermal stability and hydrothermal stability, it has been valued by the petrochemical industry at home and abroad, and has been widely used in catalytic cracking, aromatization, alkylation, disproportionation, etc. industrial chemical process. However, high catalytic efficiency requires the catalyst to have as many surface active centers as possible and short material transfer paths. Therefore, the research, development and application of nano-molecular sieves has become an important symbol of technological progress in the fields of petroleum refining, petrochemical and other catalytic fields...

Claims

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Application Information

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IPC IPC(8): C01B39/38
Inventor 刘月明王振东凌云吴海虹吴鹏何鸣元
Owner EAST CHINA NORMAL UNIVERSITY
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