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A method for synthesizing submicron naa molecular sieves

A sub-micron molecular sieve technology, applied in A-type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc.

Inactive Publication Date: 2016-08-17
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main silicon sources for the synthesis of NaA molecular sieves are sodium silicate, silica sol, water glass and amorphous SiO 2 Powder, etc., there is no literature report to synthesize NaA molecular sieve with solid silica gel as silicon source

Method used

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  • A method for synthesizing submicron naa molecular sieves
  • A method for synthesizing submicron naa molecular sieves

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take by weighing 2.50g solid silica gel, 3.21g sodium metaaluminate, 1.60g sodium hydroxide and 20.54g distilled water, dissolve sodium hydroxide in distilled water to obtain sodium hydroxide solution, divide sodium hydroxide solution equally, dissolve solid silica gel and After the sodium metaaluminate is completely dissolved, the solid silica gel solution is poured into the sodium metaaluminate solution to obtain a silica-alumina gel. Aging at 30°C for 24h, transferred to a reaction kettle for crystallization at 100°C for 4h, the obtained crude product was washed with distilled water until pH<9, and dried to obtain a submicron NaA molecular sieve.

Embodiment 2

[0024] Take by weighing 2.50g solid silica gel, 3.21g sodium metaaluminate, 1.60g sodium hydroxide and 20.54g distilled water, dissolve sodium hydroxide in distilled water to obtain sodium hydroxide solution, divide sodium hydroxide solution equally, dissolve solid silica gel and After the sodium metaaluminate is completely dissolved, the solid silica gel solution is poured into the sodium metaaluminate solution to obtain a silica-alumina gel. Aging at 20°C for 30 hours, transferred to a reaction kettle, crystallized at 120°C for 1 hour, the obtained crude product was washed with distilled water until pH<9, and dried to obtain a submicron NaA molecular sieve.

Embodiment 3

[0026] Take by weighing 2.50g solid silica gel, 3.21g sodium metaaluminate, 1.60g sodium hydroxide and 20.54g distilled water, dissolve sodium hydroxide in distilled water to obtain sodium hydroxide solution, divide sodium hydroxide solution equally, dissolve solid silica gel and After the sodium metaaluminate is completely dissolved, the solid silica gel solution is poured into the sodium metaaluminate solution to obtain a silica-alumina gel. Aged at 50°C for 18h, transferred to a reaction kettle, crystallized at 100°C for 4h, the obtained crude product was washed with distilled water until pH<9, and dried to obtain a submicron NaA molecular sieve.

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Abstract

The invention discloses a method for preparing a submicron order NaA molecular sieve by utilizing solid silicone as a silicon source, belonging to the technical field of preparation of molecular sieves. The method comprises the following steps: taking solid silicone as a silicon source, taking sodium metaaluminate as an aluminum source, weighing raw materials according to a molar ratio of (1.9-2.1):(0.9-1.1):(1.9-2.1):(50-70) of Na2O to Al2O3 to SiO2 to H2O, dissolving sodium hydroxide in distilled water, thereby obtaining a sodium hydroxide solution; equalizing the sodium hydroxide solution, respectively dissolving the solid silicone and sodium metaaluminate, pouring the solid silicone solution into the sodium metaaluminate solution after the solid silicone and sodium metaaluminate are completely dissolved, thereby obtaining aluminum silicate gel; aging the gel at the temperature of 20-50 DEG C for 18-30 hours, transferring into a reaction kettle, crystallizing at the temperature of 80-120 DEG C for 1-6 hours; and washing the obtained coarse product until the pH value is less than 9 by using distilled water, and drying, thereby obtaining the submicron order NaA molecular sieve. The NaA molecular sieve prepared by the method disclosed by the invention is low in material cost and high in degree of crystallinity, has the particle size of 400-700nm and is suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic materials, in particular to a method for preparing submicron NaA molecular sieves by using solid silica gel as a silicon source. Background technique [0002] NaA molecular sieve has a unique skeleton structure, uniform pore size, relatively simple crystal structure, relatively mature synthesis process, and a wide range of applications. Submicron molecular sieves refer to molecular sieves with a particle size of less than 1 μm. Compared with conventional molecular sieves, submicron molecular sieves have more advantages: (1) more active centers and improved reactivity; (2) larger pore volume and porosity, Its adsorption performance is special; (3) The crystal grains are small, the pores are short, and the intracrystalline diffusion resistance is small, which is conducive to the rapid entry and exit of reactant or product molecules into the molecular sieve pores. These characteristics have mad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/14
Inventor 徐会君李森马腾刘莉李洪涛齐晓勇杜庆洋
Owner SHANDONG UNIV OF TECH