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LTA and FAU molecular screen nanocrystalline preparation method

A technology of nanocrystals and molecular sieves, which is applied in the field of preparation of LTA and FAU molecular sieve nanocrystals, can solve problems such as difficulties in large-scale industrial production, and achieve the effects of superior performance, regular shape, and uniform crystal size

Active Publication Date: 2008-01-09
珠海横琴长满欧国际贸易有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method to prepare nano-molecular sieves has the advantages of fast speed and high yield, but it is difficult to achieve large-scale industrial production

Method used

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  • LTA and FAU molecular screen nanocrystalline preparation method
  • LTA and FAU molecular screen nanocrystalline preparation method
  • LTA and FAU molecular screen nanocrystalline preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing type A molecular sieve nanocrystals, the proportion of the reaction solution is: 3SiO 2 : 1.0Al 2 o 3 : 1.5(TMA)O 2 : 0.007NaCl : 276H 2 O. First, stir and dissolve Al powder + NaCl + TMAOH, and filter with a 0.2 μm filter membrane. TEOS was added dropwise to the above solution, stirred evenly, and continued to age under stirring for two days. The above reaction solution was put into a 150ml polypropylene plastic bottle, put into an oven at 100°C, and reacted statically for 15 days. After the crystallization is complete, the solid sample is separated by centrifugation at 8000 rpm for 40 minutes, and then repeatedly separated by deionized water, ultrasonic washing and centrifuge until the pH of the separated water is close to 7, and finally the solid sample is at 80 °C for 4 hours. Product A1 was obtained with a particle size of 80 nm.

Embodiment 2

[0028] A preparation method of A-type molecular sieve nanocrystals. In this example, the ratio of the reaction solution is: 2.8SiO 2 : 1.0Al 2 o 3 : 5.5(TMA)O 2 :0.057NaCl:600H 2 Except O, other is the same as embodiment one, obtains product A2, and particle size is 100nm.

Embodiment 3

[0030] A method for preparing type A molecular sieve nanocrystals, the present embodiment is the same as the first embodiment except that the reaction raw material is changed to aluminum isopropoxide. Product A3 was obtained with a particle size of 100 nm.

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Abstract

The invention relates a method for preparation of LTA and FAJJ molecular sieve nanometer crystal. The method comprises the following steps: entering the silico-aluminum into mineralization agent and TMAOH to make solution; after intimate mixing, in the condition of agitation or quiescence, making it react for 1-30 days in 100 deg.C; after crystallization, centrifugalizing and filtering it, finally scrubbing and drying and obtaining the LTA and FAJJ molecular sieve nanometer crystal, and synthesizing the LTA molecular sieve nanometer crystal in the range of (0.8-3.0)SiO2: Al2O3: (0-20)(TMA)02: (0-7.5)Na: (50-5000)H2O and FAU molecular sieve nanometer crystal in the range of 3.4SiO2:(0.5-1.8)Al2O3:(0-20)(TMA)O2: (0-7.5)Na:(50-5000)H2O.

Description

technical field [0001] The invention belongs to the preparation method of related molecular sieve materials in the field of inorganic chemistry, and in particular relates to a preparation method of LTA and FAU molecular sieve nano crystals. Background technique [0002] FAU and LTA molecular sieves are widely used in catalysis, separation, ion exchange and other fields. Most of the products obtained by existing preparation technologies are bulk phase materials with a particle size above 1 μm. Molecular sieves with this particle size cannot effectively exert their unique pore characteristics, especially It is used in the field of catalysis and ion exchange. When molecular sieves are used in the field of catalysis and ion exchange, they are expected to have the following characteristics: 1) Larger external specific surface area can obtain more active centers; 2) The reduction of particle size is conducive to the diffusion of reactants and products, making the catalyst The eff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/14
Inventor 朱广山裘式纶田景琦郭晓丹尹肖菊
Owner 珠海横琴长满欧国际贸易有限公司
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