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Small-dimensional NaA zeolite molecular sieve and preparation method thereof

A zeolite molecular sieve and molecular sieve technology, applied in the direction of A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of ineffective energy saving, long aging time, and inconsistent with the green and simple synthesis of molecular sieves. Development requirements and other issues, to achieve the effect of shortening crystallization time, low cost and shortening production cycle

Inactive Publication Date: 2017-03-29
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above reports are all about searching for effective silicon source precursors for synthesis. The gel requires a long aging time, which cannot effectively save energy. Silicon sources are often limited to several precursors such as silica gel and water glass. Certain changes have been made, which do not meet the development requirements of the green and simplified synthesis of molecular sieves

Method used

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  • Small-dimensional NaA zeolite molecular sieve and preparation method thereof
  • Small-dimensional NaA zeolite molecular sieve and preparation method thereof
  • Small-dimensional NaA zeolite molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of NaA molecular sieve mother liquor: firstly, dissolve 0.373 g sodium hydroxide in 80 mL deionized water, and mix evenly with magnetic stirring until completely dissolved; then divide the obtained sodium hydroxide solution into two beakers, Add 8.258 g of sodium aluminate in the No. 1 beaker, stir quickly until the solution in the beaker is clear; add 15.48 g of sodium metasilicate in the No. 2 beaker, stir and mix until clear; then quickly add the sodium metasilicate solution to Sodium aluminate solution, stirring vigorously until the gel is well mixed.

[0027] (2) Preparation of sucrose solution: 5.0 g of sucrose was weighed and dissolved in 50 ml of deionized water under magnetic stirring to prepare a 10 wt% sucrose solution.

[0028] (3) Addition of sucrose solution: Measure 10 ml of the prepared sucrose solution, slowly drop the sucrose solution into the NaA molecular sieve mother liquor, and continue to stir for 4 hours to form a gel.

[0029] (...

Embodiment 2

[0031] (1) The preparation method of NaA molecular sieve mother liquor is the same as step (1) in Example 1;

[0032] (2) The preparation of the sucrose solution is the same as step (2) in Example 1;

Embodiment 3

[0036] (1) The preparation method of NaA molecular sieve mother liquor is the same as step (1) in Example 1;

[0037](2) The preparation of the sugar solution is the same as step (2) in Example 1; the difference from Example 1 is that the prepared sugar solution is a glucose solution, and the prepared content is a glucose solution with a concentration of 10 wt%.

[0038] (3) Addition of glucose solution: the implementation method is the same as step (3) in Example 1; measure 10 ml of the pre-configured glucose solution, slowly drop the glucose solution into the NaA molecular sieve mother liquor, and continue stirring for 4 hours to form gel.

[0039] (4) Crystallization of molecular sieves: this implementation method is the same as step (4) in Example 1; the prepared NaA molecular sieve still has a smaller particle size.

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Abstract

The invention discloses a small-dimensional NaA zeolite molecular sieve and a preparation method thereof. The preparation method includes steps of preparing NaA molecular sieve mother liquor, preparing inhibitor solution, adding the inhibitor solution and performing hydrothermal crystallization on the molecular sieve; transferring a final gel in a stainless steel reaction kettle containing polypropylene lining, crystalizing for 4-6 hours at 90-110 DEG C, and washing the obtained a hydrothermal solid product for many times, and drying the product and finally obtaining the NaA molecular sieve. Through the way of hydro-thermal synthesis, carbohydrate and other matters are added in the mother liquor of the NaA molecular sieve to inhibit the growth of molecular sieve crystal nucleus, and thereby preparing the small-dimensional molecular sieve. Compared with the product obtained by a traditional method, the granular dimension of the molecular sieve prepared by the method is reduced by 10 times. The preparation method is simple in technique, low in cost, and suitable for high-efficient production of the small-dimensional NaA molecular sieve.

Description

technical field [0001] The invention belongs to the field of zeolite material synthesis, and in particular relates to a small-sized NaA type zeolite molecular sieve and a preparation method thereof. Background technique [0002] Zeolite molecular sieves are crystalline microporous inorganic compounds, and are inorganic framework materials developed in recent decades. Its space grid structure is full of open cavities and pores and has a huge internal surface area, which makes it have adsorption, ion exchange, catalysis, acid and heat resistance, and can be used for gas drying, purification and environmental protection. Protection, building materials, etc., can also be used as an important catalytic material in petrochemical, fine chemical and other fields. [0003] NaA type zeolite molecular sieve is one of the earliest zeolite molecular sieves artificially synthesized. It is an aluminosilicate compound with a cubic lattice. The specific surface area is widely used as deter...

Claims

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Application Information

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IPC IPC(8): C01B39/16
CPCC01B39/16C01P2002/72C01P2004/03C01P2004/62
Inventor 何丹农王敬锋林琳金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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