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Preparation method for low silicon-aluminum ratio nanosheet flower cluster-like mordenite molecular sieve

A technology of mordenite and low silicon-aluminum ratio, which is applied in the field of preparation of low-silicon-aluminum ratio nanosheet flower cluster mordenite molecular sieves, to achieve the effects of large specific surface area, accelerated reaction rate, and low silicon-aluminum ratio

Inactive Publication Date: 2014-02-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The morphology of mordenite molecular sieves reported in the literature is film-like, dish-like, rod-like, flake-like, etc. The literature has reported the synthesis method of flaky mordenite with a high silicon-aluminum ratio, but there are also reports of low-silicon-aluminum ratio nanosheets. Preparation method of clustered mordenite molecular sieve

Method used

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  • Preparation method for low silicon-aluminum ratio nanosheet flower cluster-like mordenite molecular sieve
  • Preparation method for low silicon-aluminum ratio nanosheet flower cluster-like mordenite molecular sieve
  • Preparation method for low silicon-aluminum ratio nanosheet flower cluster-like mordenite molecular sieve

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Embodiment 1

[0014] 1) At room temperature, first add 0.8501g of sodium metaaluminate and 1.6593g of sodium hydroxide to 46.67g of deionized water, then slowly add 31.1111g of silica sol (25wt%) into the solution, and age for 30min under stirring at room temperature to form Uniform white colloid;

[0015] 2) Transfer 80.2914g of the white colloid obtained in step 1) to a 100ml PTFE-lined stainless steel reactor, and conduct a hydrothermal reaction at a temperature of 170°C for 4 days. The obtained reaction product is vacuum filtered and washed with deionized water Until the pH value of the washing solution is equal to 7.5, dry at a temperature of 120°C for more than 12 hours, and finally heat up to 550°C for 6 hours at a heating rate of 5°C / min to obtain 7.0 g of nano-flake clustered mordenite molecular sieves; (see attached figure 1 )

Embodiment 2

[0017] 1) At room temperature, first add 0.7286g of sodium metaaluminate and 1.4222g of sodium hydroxide into 60.0g of deionized water, then slowly add 26.6667g of silica sol (25wt%) into the solution, and age for 30min under stirring at room temperature to form Uniform 88.8175g white colloid;

[0018] 2) Transfer the white colloid obtained in step 1) to a 100ml PTFE-lined stainless steel reactor, and conduct a hydrothermal reaction at a temperature of 170°C for 4 days. The obtained reaction product is vacuum filtered and washed with deionized water until it is washed. The pH value of the liquid is equal to 7.5, dried at a temperature of 120°C for more than 12 hours, and finally heated to 550°C for 6 hours at a heating rate of 5°C / min to obtain 5.5g of nano-flake clustered mordenite molecular sieves; (see attached figure 2 )

Embodiment 3

[0020] 1) At room temperature, first add 0.5829g of sodium metaaluminate and 1.1378g of sodium hydroxide to 64.0g of deionized water, then slowly add 21.3333g of silica sol (25wt%) into the solution, and age for 30min under stirring at room temperature to form Uniform 87.054g white colloid;

[0021] 2) Transfer the white colloid obtained in step 1) to a 100ml PTFE-lined stainless steel reactor, and conduct a hydrothermal reaction at a temperature of 170°C for 4 days. The obtained reaction product is vacuum filtered and washed with deionized water until it is washed. The pH value of the liquid is equal to 8, dried at a temperature of 120°C for more than 12 hours, and finally heated to 550°C at a heating rate of 5°C / min and calcined for 6 hours to obtain 4.0 g of nano-flake cluster mordenite molecular sieves; (see attached image 3 )

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Abstract

The invention discloses a preparation method for a low silicon-aluminum ratio nanosheet flower cluster-like mordenite molecular sieve. The preparation process of the mordenite molecular sieve includes: dissolving an aluminum source and an alkali source in deionized water, adding silica sol into the obtained clarified solution to obtain a uniform white colloid, transferring the white colloid into a reaction kettle to undergo hydrothermal reaction, thus obtaining the low silicon-aluminum ratio nanosheet flower cluster-like mordenite molecular sieve. The mordenite molecular sieve prepared by the invention has the advantages of wide silicon source and aluminum source, low silicon-aluminum ratio, multiple active centers, no adding of any surfactant, low preparation cost, less environmental pollution and large specific surface area, and is conducive to spread of the reactants and product and acceleration of the reaction rate, thus being widely applicable in adsorption, separation, catalytic cracking, isomerization and other fields.

Description

technical field [0001] The invention relates to a method for preparing a low-silicon-aluminum ratio nano flake-like clustered mordenite molecular sieve, which belongs to the technical field of mordenite molecular sieves. Background technique [0002] Mordenite is a crystalline microporous aluminosilicate, due to its regularly arranged pore structure, large specific surface area, high stability and strong acidity, it is widely used in adsorption, separation, catalytic cracking and isomerization, etc. The field has important industrial application value. However, due to its small pore size, the catalytic activity is greatly reduced due to the limitation of molecular diffusion rate when catalytic reactions involving macromolecules are involved. To solve this problem, the diffusion rate of molecules in the crystal is improved by reducing the particle size of the zeolite molecular sieve, that is, synthesizing a nano-sized zeolite molecular sieve. [0003] The morphology of mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/26B82Y30/00B82Y40/00
Inventor 李新刚刘亚华
Owner TIANJIN UNIV
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