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Method for synthesizing nano ZSM-23 molecular screen

A technology of ZSM-23 and synthesis method, which is applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems such as the grain size of ZSM-23 that have not been discussed, and achieve the effects of industrial production and application, short production process and low cost

Inactive Publication Date: 2008-07-09
EAST CHINA NORMAL UNIV
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Problems solved by technology

The subject of the synthesized ZSM-23 grain size is not discussed in the above patents

Method used

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  • Method for synthesizing nano ZSM-23 molecular screen

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Embodiment 1

[0021] 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 templating agent: H 2 O is 0.006:1:0.06:0.8:12, the aluminum source is sodium metaaluminate, the silicon source is silica sol, the alkali source is sodium hydroxide, and the organic template is iso Propylamine; in the second step, hydrothermal crystallization at 170°C for 3 days. The scanning electron micrograph of the obtained product nanometer ZSM-23 molecular sieve is shown in Figure 1, and the average diameter of its grain cross section is 75nm.

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 templating agent: H 2 O is 0.016:1:0.08:1.2:20, the aluminum source is sodium metaaluminate, the silicon source is silica sol, the alkali source is sodium hydroxide, and the organic template is iso Propylamine; in the second step, hydrothermal crystallization at 170°C for 3 days. The scanning electron micrograph of the obtained product nanometer ZSM-23 molecular sieve is similar to Fig. 1, and the average diameter of its grain cross section is 55nm.

Embodiment 3

[0025] 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 templating agent: H 2 O is 0.01:1:0.05:1.0:12, the aluminum source is sodium metaaluminate, the silicon source is silica sol, the alkali source is sodium hydroxide, and the organic template is iso Propylamine; in the second step, hydrothermal crystallization at 170°C for 3 days. The scanning electron micrograph of the obtained product nanometer ZSM-23 molecular sieve is similar to that in Fig. 1, and the average diameter of its grain cross section is 65nm.

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Abstract

A synthetic method of Nanosized ZSM-23 zeolites belongs to the technical field of synthesis of inorganic chemistry. Firstly preparing reaction mixture from sodium metaaluminate or aluminum sulfate, silicasol or soluble glass, sodium hydroxide and isopropylamine, then hydrothermal crystallizing the reaction mixture, at last obtaining the Nanosized ZSM-23 zeolites through conventionally filtering, washing, drying and sintering the hydrothermal crystallized reaction mixture. The synthetic method has the advantages that average diameter of the cross sections of crystal grains of the synthesized ZSM-23 zeolites is not more than 100 nm, the specific surface area is comparatively high, production flow is short, the cost is low, and the method is favorable for industrial production and application.

Description

technical field [0001] A method for synthesizing nano ZSM-23 molecular sieves belongs to the technical field of inorganic chemical synthesis. Background technique [0002] ZSM-23 molecular sieve is a medium-porous, high-silica molecular sieve with MTT topology. The framework topology of ZSM-23 molecular sieve includes five-membered rings, six-membered rings and ten-membered rings. The one-dimensional channels composed of ten-membered rings are parallel channels that are not cross-linked with each other, and the free diameter is 0.56×0.45nm. Due to the unique pore structure and strong surface acidity of ZSM-23 molecular sieve, it shows high catalytic activity and selectivity in butene isomerization reaction and catalytic cracking reaction. Especially in recent years due to the shortage of petroleum resources and the demand for ethylene and propylene is increasing year by year, ZSM-23 molecular sieve shows excellent potential in the reaction of catalytic cracking carbon tetra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
Inventor 刘月明刘晔王振东吕爱玲吴鹏吴海虹何鸣元
Owner EAST CHINA NORMAL UNIV
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