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Method for synthesizing nanometer size mordenite

A mordenite, nano-sized technology, applied in mordenite crystalline aluminosilicate zeolite, chemical instruments and methods, crystalline aluminosilicate zeolite, etc., can solve the problems of expensive raw materials, slow progress, and low concentration of crystallization mother liquor, etc. Achieve the effect of easy industrial production, high crystallinity and low cost

Inactive Publication Date: 2005-09-14
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Acta Catalytica Sinica 2002, 23(2): 145-149) under the action of tetraethylammonium ions, the mordenite membrane with a grain size of 20-30 microns was synthesized under the action of silica sol, sodium aluminate and sodium hydroxide. , Stirring and aging are required for 3 days before crystallization, and the crystallization time is 3-4 days at 170°C to complete, but the concentration of the crystallization mother liquor in this method is extremely small (H 2 O / SiO 2 =62.5), the raw material is very expensive, which is unfavorable for the needs of a large amount of synthetic zeolite in industry
[0007] In the field of small-grain mordenite, the progress of synthesis research is relatively slow, and no one has published patented technology yet

Method used

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  • Method for synthesizing nanometer size mordenite
  • Method for synthesizing nanometer size mordenite
  • Method for synthesizing nanometer size mordenite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Synthesize nanometer size mordenite according to the method provided by the invention

[0039] Raw material is

[0040] (A) Silica gel powder: containing SiO 2 92.44 wt%.

[0041] (B) Sodium aluminate: content Al 2 o 3 : 5.301*10 -3 mol / g; Na 2 O: 6.541*10 -3 mol / g, chemically pure.

[0042] (C) Tetraethylammonium bromide: content 61.61wt%, industrial product.

[0043] (D) Sodium chloride: content 99.5wt%, chemically pure.

[0044] (E) Sodium hydroxide: content Na 2 O: 0.0125mol / g, chemically pure.

[0045] (F) propionic acid: content 99.0wt%, chemically pure.

[0046] Take 17.02 grams of sodium aluminate, 12.03 grams of sodium hydroxide, 5.27 grams of sodium chloride, and 91.09 grams of tetraethylammonium bromide solution, dissolve them in 96.49 grams of deionized water while stirring, and dissolve 100 grams of silica gel under constant stirring. Add the powder into the above solution, adjust the pH value to 12.85 with propionic acid, stir evenly, transfer ...

Embodiment 2

[0050] The raw materials are:

[0051] (G) Silica gel powder: containing SiO 2 92.44 wt%.

[0052] (H) Sodium aluminate: content Al 2 o 3 : 5.301*10 -3 mol / g; Na 2 O: 6.541*10 -3 mol / g, chemically pure.

[0053] (1) Tetrapropylammonium bromide: content 61.61wt%, industrial product.

[0054] (J) Sodium chloride: content 99.5wt%, chemically pure.

[0055] (K) Sodium hydroxide: content Na 2 O: 0.0125mol / g, chemically pure.

[0056] (L) Acetic acid: content 99.0wt%, chemically pure.

[0057] 12.82 grams of sodium aluminate, 9.06 grams of sodium hydroxide, 5.96 grams of sodium chloride, and 116.1 grams of tetrapropylammonium bromide solution were dissolved in 216.01 grams of deionized water under stirring, and 75 grams of silica gel powder were dissolved under constant stirring. Add it into the above solution, adjust the pH value to 12 with formic acid, stir evenly, transfer it to a stainless steel pressure kettle, stir and age at room temperature for 9 hours, and carry ...

Embodiment 3

[0060] Raw material is

[0061] (M) Silica gel powder: containing SiO 2 92.44 wt%.

[0062] (N) Sodium aluminate: content Al 2 o 3 : 5.301*10 -3 mol / g; Na 2 O: 6.541*10 -3 mol / g, chemically pure.

[0063] (O) Tetraethylammonium hydroxide: content 61.61wt%, industrial product.

[0064] (P) Sodium chloride: content 99.5wt%, chemically pure.

[0065] (Q) Sodium hydroxide: content Na 2 O: 0.0125mol / g, chemically pure.

[0066] (R) Acetic acid: content 99.0wt%, chemically pure.

[0067] Take 8.55 grams of sodium aluminate, 6.04 grams of sodium hydroxide, 7.94 grams of sodium chloride, and 46.03 grams of tetraethylammonium hydroxide solution, dissolve them in 92.86 grams of deionized water while stirring, and dissolve 50 grams of silica gel under constant stirring. Add the powder to the above solution, adjust the pH value to 8.15 with acetic acid, stir evenly, transfer to a stainless steel pressure kettle, stir and age at room temperature for 13 hours, and crystallize acc...

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Abstract

This invention discloses a synthetic method of nanometer level mordenite. The procedures are that silica resource and aluminum resource are added into water solution of tetraethyl or four-propyl organic amine-group compound, addictives are organic weak acid and NaCl. Ageing 1-10 hours in greenhouse, then crystallize at 140-2000C for 15-30 hours, the pH value of reaction system is 8-13, then the nanometer level mordenite can be collected from the reactive product. The feature of this invention is that few organic ammonium ion is used as template agent, the silica resource is inexpensive silica flour, the aluminum source is sold sodium aluminate. The synthetic nanometer level mordenite has high crystallinity and low cost, it is convenient for industrial generation.

Description

technical field [0001] The invention relates to a new method for synthesizing nanometer-sized mordenite. The average particle diameter of the nanometer-sized molecular sieve is nanoscale. The technical field belongs to C01B 39 / 00 according to the International Patent Classification. Background technique [0002] Nanotechnology is a high-tech technology born in the 1980s. Nanoparticles refer to particles with a particle diameter between 1 and 500nm. [0003] Nano-sized molecular sieves are an important part of nanomaterials, also known as ultrafine particle molecular sieves, which are a type of atomic group composed of a small number of atoms between solids and molecules. The physical properties and chemical properties of nano-sized molecular sieves, such as thermal stability and chemical activity, are very different from those of conventional molecular sieves. This special property comes from surface effects and volume effects. As the grain size decreases, the proportion o...

Claims

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Application Information

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IPC IPC(8): B01J21/16C01B39/26
Inventor 金杏妹谢庆华谢亮亮王剑
Owner EAST CHINA UNIV OF SCI & TECH
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