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4A type zeolite molecular sieve and its preparation method

A technology of zeolite molecular sieve and iron ion, which is applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of reducing the magnetic properties of zeolite molecular sieve, and achieve the effect of long retention time, magnetic stability and moderate size

Inactive Publication Date: 2008-08-27
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a 4A-type zeolite molecular sieve and its preparation method. The 4A-type zeolite molecular sieve is a 4A-type zeolite molecular sieve loaded with iron-containing oxides on the surface, and has certain magnetic properties. It can be easily recovered, which not only solves the problem that the powdered zeolite molecular sieve is difficult to recover in the reaction solution, but also overcomes the disadvantage that the addition of the binder correspondingly reduces the various properties of the powdered zeolite molecular sieve; its preparation method Simple, no need for organic amine templates, low reaction temperature, short time, and no need to add surfactants, thus overcoming the disadvantages of complex preparation process by magnetic carrier method and adding surfactants will also reduce the magnetic properties of zeolite molecular sieves

Method used

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Examples

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Effect test

Embodiment 1

[0033] (1) Synthesis of 4A type zeolite molecular sieve: industrial grade water glass with a modulus of 3.2, NaAlO 2 , NaOH and deionized water are the raw materials for synthesizing 4A zeolite molecular sieves. First, add deionized water, NaOH and NaAlO into a three-necked flask placed in a constant temperature water bath at 40°C 2 , after fully stirring, mixing and dissolving, quickly add water glass, the addition amount is based on the following mass ratio: water glass: NaAlO 2 : NaOH: Deionized water = 11:10:8:200, mix the glue for 30-40 minutes to make it into a uniform white gel, then adjust the temperature to 95°C within 40-60 minutes, stop stirring, and let stand Constant temperature crystallization for 6 to 8 hours. After crystallization, filter and separate the obtained crystalline product, wash with deionized water until neutral, and finally dry at 110°C to obtain white powder 4A zeolite molecular sieve. figure 2 It is a low magnification scanning electron microsc...

Embodiment 2

[0037] (1) Synthesis of 4A-type zeolite molecular sieve: the specific preparation process is the same as step (1) in Example 1.

[0038] (2) Preparation of iron ion solution and ammonia solution: the specific preparation process is the same as step (2) in Example 1.

[0039] (3) Magnetically modified 4A zeolite molecular sieve by chemical precipitation method: take 200 mL of the iron ion solution prepared in step (2) and place it in a three-neck flask with constant temperature water bath temperature control, and add it to step (1) at a temperature of 40 ° C to synthesize 3g of 4A-type zeolite molecular sieve white powder, while stirring the feed liquid in the there-necked flask, slowly add 150mL of dilute ammonia solution prepared in step (2) dropwise, so that the slowly generated magnetic iron-containing oxide is settled and loaded on the 4A-type zeolite molecular sieve Surface, after the reaction is completed, filter the solid phase product, wash with deionized water until n...

Embodiment 3

[0041] (1) Synthesis of 4A-type zeolite molecular sieve: the specific preparation process is the same as step (1) in Example 1.

[0042] (2) Preparation of iron ion solution and ammonia solution: the specific preparation process is the same as step (2) in Example 1.

[0043] (3) Magnetically modified 4A zeolite molecular sieve by chemical precipitation method: Take 200mL of the iron ion solution prepared in step (2) and place it in a three-neck flask with constant temperature water bath temperature control, and add it to step (1) at a temperature of 50°C to synthesize 4g of the 4A type zeolite molecular sieve white powder, while stirring the feed liquid in the there-necked flask, slowly add 150mL of the dilute ammonia solution prepared in step (2) dropwise, so that the slowly generated magnetic iron-containing oxide is settled and loaded on the 4A type zeolite molecular sieve On the surface, after the reaction is completed, the solid phase product is filtered, washed with deio...

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Abstract

A 4A zeolite molecular sieve with a certain magnetism and carrying Fe contained compound on its surface is a granular one containing Fe (3.55-9.70 mass%). Its preparing process includes such steps as synthesizing 4A zeolite molecular sieve, preparing Fe ion solution and aqueous solution of NH4, and magnetically modifying the 4A zeolite molecular sieve by chemical deposition method.

Description

technical field [0001] The technical solution of the invention relates to the field of zeolite molecular sieve materials, in particular to a magnetic 4A type zeolite molecular sieve and a preparation method thereof. Background technique [0002] The currently synthesized zeolite molecular sieves are powder products. Although fine zeolite molecular sieve crystals have good adsorption performance, ion exchange performance, selectivity performance, thermal stability performance and catalytic performance, but the powder product is extremely inconvenient to use in industry, so it must be prepared in practical application. Aggregates of shape and size, the current method is to add 20% to 60% of binder to molecular sieve powder to make particles with certain strength and shape. The zeolite molecular sieve catalyst disclosed in "CN85100759 Zeolite Molecular Sieve Catalyst and Its Preparation" is formed by adding viscosity. However, the addition of binders correspondingly reduces v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02
Inventor 曹吉林付睿张广林李梦青
Owner HEBEI UNIV OF TECH
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