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Method for preparing hollow zeolite socony mobil-5 (ZSM-5) nanometer zeolite
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A ZSM-5, nano-zeolite technology, applied in nano-technology, crystalline aluminosilicate zeolite, borocarbonane silicone crystalline aluminosilicate zeolite, etc. Problems such as low crystallinity, to achieve the effect of low cost, simple method and high yield
Active Publication Date: 2012-06-13
DALIAN UNIV OF TECH
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[0007] The object of the present invention is to provide a kind of simple and easy method for preparing hollow ZSM-5 nanometer zeolite, has improved the productive rate of hollow ZSM-5 nanometer zeolite, has solved general alkali treatment silicon-aluminum ratio adjusting range is little and productive rate and Problems such as low crystallinity
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Embodiment 1
[0040] Preparation of silicon-aluminum molar ratio SiO 2 / Al 2 o 3 For 80 monodisperse ZSM-5 nano zeolites:
[0041]①Mix 30.8ml tetrapropylammonium hydroxide (TPAOH) aqueous solution with 30.8ml tetrapropylammonium hydroxide (TPAOH) of 1.14mol / L, hydrolyze at 35°C for 3h, and define it as solution A;
[0042] ② Mix 1.2g of aluminum isopropoxide with 66ml of water, hydrolyze at 80°C for 3h, and define it as solution B;
[0043] ③Add solution B to solution A dropwise, react at 35°C for 2 hours, remove alcohol at 80°C for 2 hours, add water to 130ml, crystallize at 170°C for 72 hours, centrifuge, dry at 80°C, and roast at 540°C.
[0044] Preparation of hollow ZSM-5 nano zeolite:
[0045] 1. the ZSM-5 nanometer zeolite prepared by 6g is mixed with the tetrapropylammonium hydroxide (TPAOH) aqueous solution of 60ml, 0.1mol / L;
[0046] ②At 170°C, stir for 72 hours, and centrifuge;
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Abstract
The invention relates to a method for preparing hollow zeolite socony mobil-5 (ZSM-5) nanometer zeolite. The method is characterized by comprising the following steps of: mixing single-dispersion ZSM-5 nanometer zeolite of which the silicon-aluminum molar ratio of SiO2 / Al2O3 is over 20 and the partical size ranges from 100 to 400 nanometers with 0.05 to 0.5 mol / L of an aqueous solution of alkaline substances, wherein the alkaline substances are selected from a mixture in which a molar ratio of quaternaryammonium salt to sodiumhydroxide is 1:1, a mixture in which a molar ratio of the quaternaryammonium salt to potassiumhydroxide is 1:1, n-butylamine and quaternaryammonium base; and stirring at the temperature of between 80 and 200 DEG C for 10 to 200 hours, and separating. By the method, a regular cavity structure is formed, so that reactants and products are easy to transfer, and the crystallinity is high; and the method is simple, low in cost and high in yield, and can be used for mass production. The hollow ZSM-5 nanometer zeolite with different silicon-aluminum ratios can be obtained by using different matrixes or under different treatment conditions, and the sizes of cavities of hollow ZSM-5 nanometer zeolite can be regulated by changing the treatment condition.
Description
technical field [0001] The invention relates to a preparation method of hollow ZSM-5 nanometer zeolite. Background technique [0002] The earliest studies on molecular sieve materials were zeolite molecular sieves, including natural zeolite and artificial zeolite. In the 1940s, zeolite chemists headed by Barrer R M successfully imitated the formation conditions of natural zeolites and synthesized the first batch of zeolites with low silicon-aluminum ratio under hydrothermal conditions. The pore diameter of zeolite is mostly less than 1.5nm, which belongs to the category of microporous materials, so it is also called microporous molecular sieve. Zeolitemolecular sieve materials represented by ZSM-5 have become one of the key areas that researchers pay attention to because of their important application value in the fields of adsorption, separation, and catalysis. However, the narrow pores prevent them from effectively catalyzing macromolecular reactions. Although the emer...
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