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Method for synthesizing ZSM-5 molecular sieve

A technology of ZSM-5 and molecular sieve, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems such as difficult synthesis of ZSM-5 molecular sieve, and achieve the effect of broadening the synthesis range

Inactive Publication Date: 2014-07-23
NANJING UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that ZSM-5 molecular sieves are difficult to synthesize under high pH conditions, the present invention suppresses the formation of heterocrystalline sodalite zeolite by adding certain additives, breaking the traditional view that ZSM-5 cannot be synthesized under high pH conditions, and broadens the scope of The scope of synthesis of ZSM-5 molecular sieve, there is no report in this regard

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  • Method for synthesizing ZSM-5 molecular sieve
  • Method for synthesizing ZSM-5 molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Add sodium metaaluminate and silica sol to a certain amount of deionized water, stir at room temperature until dissolved, then add tetrapropylammonium hydroxide and ethylamine under stirring, adjust the mixing with 5mol / L sodium hydroxide solution The pH of the solution is 10, and the molar ratio of the initial gel of the reaction mixture is: SiO 2 / Al 2 o 3 =50,TPAOH / SiO 2 =0.15, ethylamine / SiO 2 =0.05,H 2 O / SiO 2 =30, stirred overnight at room temperature, crystallized at 150°C for 5 hours, filtered, washed, dried, and roasted to obtain ZSM-5 molecular sieves. The XRD phase diagram of the synthesized ZSM-5 is shown in figure 1 , the crystallinity is recorded as 100%.

Embodiment 2

[0023] Add sodium metaaluminate and silica sol to a certain amount of deionized water, stir at room temperature until dissolved, then add tetrapropylammonium hydroxide and dimethylamine under stirring, adjust with 12mol / L sodium hydroxide solution The pH of the mixture is 11, and the molar ratio of the initial gel of the reaction mixture is: SiO 2 / Al 2 o 3 =10,TPAOH / SiO 2 =0.15, dimethylamine / SiO 2 =0.05, H 2 O / SiO 2 =20, stirred overnight at room temperature, crystallized at 160°C for 2 hours, filtered, washed, dried, and roasted to obtain ZSM-5 molecular sieve with a relative crystallinity of 84%.

Embodiment 3

[0025] Add aluminum sulfate and water glass to a certain amount of deionized water, stir at room temperature until dissolved, then add tetrapropylammonium bromide and diethylamine under stirring, and adjust the mixed solution with 12mol / L sodium hydroxide solution pH = 11, the molar ratio of the initial gel of the reaction mixture is: SiO 2 / Al 2 o 3 =100,TPABr / SiO 2 =0.05, diethylamine / SiO 2 =0.01,H 2 O / SiO 2 =40, stirred overnight at room temperature, crystallized at 180°C for 5 hours, filtered, washed, dried, and roasted to obtain ZSM-5 molecular sieve with a relative crystallinity of 87%.

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Abstract

The invention relates to a method for synthesizing a ZSM-5 molecular sieve. The method comprises the following specific steps: mixing a silicon source, an aluminum source, a template agent, an assistant and water according to a certain ratio, adjusting the pH value of the mixture, stirring to dissolve at room temperature, transferring into a stainless steel crystallization kettle with a polytetrafluoroethylene liner, carrying out crystallization at a certain temperature, filtering, washing, drying and roasting to obtain the ZSM-5 molecular sieve with good crystallinity. The method provided by the invention inhibits the formation of mixed crystal analcime by adding certain assistants, breaks through the conventional concept that ZSM-5 cannot be synthesized under high pH conditions, widens the synthesis range of the ZSM-5 molecular sieve, and has important research value and theoretical significance.

Description

technical field [0001] The invention relates to a method for synthesizing ZSM-5 molecular sieves, in particular to a method for synthesizing ZSM-5 molecular sieves under high pH value conditions by adding auxiliary agents. Background technique [0002] ZSM-5 molecular sieve is a high-silica zeolite with a three-dimensional pore structure first developed by Mobile Company of the United States in 1972. Composed of intersecting channels. Due to the special pore structure, good thermal stability and hydrothermal stability of ZSM-5, it has excellent shape-selective catalytic performance, especially in isomerization, alkylation, disproportionation, selective cracking and methanol to gasoline, etc. It shows unique catalytic activity in the reaction, so it is widely used as catalyst material and catalyst carrier. The preparation technology of ZSM-5 molecular sieve is also a hot spot in current research. The commonly used synthetic methods include hydrothermal synthesis, clear liqu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40
Inventor 周志伟秦娟武文良林加明茆伟韩田朋韩超凡孙磊
Owner NANJING UNIV OF TECH
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