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Preparation method for pure silicon beta molecular sieve film

A technology of molecular sieve and pure silicon, which is applied in the field of pure silicon beta molecular sieve membrane preparation, can solve the problems of long synthesis time and limit the application value of beta molecular sieve membrane, and achieve good repeatability

Inactive Publication Date: 2011-07-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, longer synthesis time, non-oriented surface, and thicker membrane section still limit the application value of beta molecular sieve membranes in industry

Method used

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  • Preparation method for pure silicon beta molecular sieve film
  • Preparation method for pure silicon beta molecular sieve film
  • Preparation method for pure silicon beta molecular sieve film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A method for preparing a beta molecular sieve membrane with a single crystal silicon wafer (Beijing Institute of Nonferrous Metals) as a carrier.

[0047] Preparation of step 1 seed crystal: the reaction ratio of nano-beta molecular sieve seed crystal solution is: 4.5molNaOH: 25mol SiO 2 (Silica): 9.0mol Tetraethylammonium Hydroxide (TEAOH): 0.5molNaAlO 2 : 360mol H 2 O. Add 3.0 grams of white carbon black to a mixed solution of 5.89 grams, 45%wt tetraethylammonium hydroxide solution, 0.36 grams of sodium hydroxide, 0.082 grams of sodium aluminate, and 9.72 grams of distilled water, and stir until uniform on an electromagnetic stirrer. Then the reaction mixed solution was transferred to the lining of the reaction kettle, the kettle was installed, sealed, and crystallized at 100° C. for 10 days. The product is repeatedly centrifuged, washed with water, and the aqueous solution is neutralized, then dried; dealumination of nano-beta zeolite seed crystals: add 60 g of 60...

Embodiment 2

[0054] A method for preparing a beta molecular sieve membrane using a single crystal silicon chip as a carrier.

[0055] Except that the carrier was dropped into 10g / L seed crystal emulsion to prolong for 12 minutes, the others were the same as in Example 1 to obtain a beta molecular sieve membrane (M2) with a single crystal silicon chip as a carrier, with a thickness of 2.2 microns.

Embodiment 3

[0057] A method for preparing a beta molecular sieve membrane using a single crystal silicon chip as a carrier.

[0058] Except that the seed crystal carrier was laid flat on the bottom of the kettle, the others were the same as in Example 1 to obtain a beta molecular sieve membrane (M3) with a single crystal silicon chip as a carrier, with a thickness of 2.5 microns.

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Abstract

The invention pertains to the preparation field of pure silicon beta molecule sieve membrane, which in particular relates to a method for preparing highly-oriented beta molecule sieve membrane using dealuminized beta molecule sieve seeds on a plurality of carriers. The seeded carriers are prepared on a pre-treated carrier with a ratio of 2-6 mol NaOH: 10-50 mol white carbon: 2-15 mol tetraethyl ammonium hydroxide, 0.2-2 mol NAAlO2: 100-500 mol H2O, and then the molecule sieve membrane is prepared on the seeded carriers with a ratio of 0.1-10mol tetraethyl ammonium hydroxide: 0.1-10mol hydrofluoric acid: 0.05-5mol hydrofluoric acid: 0.5-50mol H2O. Suitable carriers include monocrystalline silicon wafer, glass flake, stainless steel coupons, stainless steel meshes and ceramic sheet. The membrane is continuous and compact with better repeatability, and applicable to industrial scale-up.

Description

technical field [0001] The invention belongs to the field of preparation of pure silicon beta molecular sieve membranes, in particular to the use of dealuminated beta molecular sieve seed crystals on various carriers in TEAOH-HF-SiO 2 -H 2 A method for preparing highly oriented beta molecular sieve membranes by secondary growth in a gel system of O. Background technique [0002] In recent years, more and more attention has been paid to the synthesis of molecular sieve membranes integrating catalysis and separation. Higher requirements are put forward for the quality of molecular sieve membranes used in membrane reactors, membrane selective sensors, photoelectric materials, etc., including thinness, density (no voids), and directionality. In particular, improving the orientation of the molecular sieve membrane has an important influence on the smoothness and transparency of the surface of the molecular sieve membrane. This is of great significance to the application of mol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/06B01D67/00B01D71/02C01B37/02B01J29/03
Inventor 朱广山裘式纶陈艳丽
Owner JILIN UNIV