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Method for preparing Ti -Si molecular sieve membrane by microwave radiating heating

A titanium-silicon molecular sieve and microwave radiation technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of increasing the crystal gap of molecular sieve membranes, the long synthesis time of seed crystal method, and the amplification of molecular sieve membranes, etc., to achieve heating speed Fast, excellent catalytic performance, the effect of shortening the crystallization time

Inactive Publication Date: 2010-04-14
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of the in-situ hydrothermal synthesis method is that it is difficult to scale up the preparation of molecular sieve membranes with industrial applications, and it is very sensitive to the synthesis conditions and has low reproducibility. When the template agent is removed by high-temperature calcination, it is often accompanied by the shrinkage of the molecular sieve crystals, while This will generate or increase the crystal gap of the molecular sieve membrane, and the synthesis time is very long, usually several days
Similar to the in situ hydrothermal synthesis method, the synthesis time of the seeding method is also very long

Method used

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  • Method for preparing Ti -Si molecular sieve membrane by microwave radiating heating
  • Method for preparing Ti -Si molecular sieve membrane by microwave radiating heating
  • Method for preparing Ti -Si molecular sieve membrane by microwave radiating heating

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0018] Slowly add orthoethyl silicate (TEOS) dropwise into an aqueous solution of tetrapropylammonium hydroxide (8%), stir vigorously at room temperature until the solution is clear, and tetrabutyl titanate (TBOT) is dissolved in isopropanol , slowly add it dropwise to the aforementioned sol at 0°C under the protection of nitrogen, stir for 1 hour, carefully raise the temperature to 80°C, keep the temperature constant for 2 hours, add water to the original liquid level, and obtain a milky white precursor colloid synthesis liquid, its composition TEOS: 0.01TBOT: 0.25TPAOH: 40H 2 O, the precursor colloid synthesis liquid and α-Al 2 o 3 The carrier is placed in the crystallization kettle, α-Al 2 o 3 The upper surface of the carrier is in contact with the synthesis liquid, heated at 180°C, 900MHz microwave radiation field for 3.5 hours, after the crystallization is completed, the reactor is quenched, the sample is taken out, rinsed with deionized water, dried, and calcined at 5...

Embodiment approach 2

[0020] The composition of precursor colloid synthesis solution is TEOS: 0.01TBOT: 0.20TPAOH: 46H 2 O, heated at 180° C. for 3.5 hours in a microwave radiation field of 1600 MHz, and the others are the same as Embodiment 1.

Embodiment approach 3

[0022] The composition of precursor colloidal synthesis liquid is: TEOS: 0.015TBOT: 0.16TPAOH: 50H 2 O, heating at 180° C., 4500 MHz microwave radiation field for 3 hours, and sintering at 550° C. for 2 hours. Others are the same as Embodiment 1.

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Abstract

The invention relates to a method for preparing a Ti -Si molecular sieve membrane by microwave radiating heating, belonging to the technical field of sieve membrane synthesis, in particular to a sieve membrane synthesis method. The method is characterized in that a carrier is directly contacted with a synthetic liquid, and is heated and crystallized by the microwave radiation. The experiment result shows that: compared with a hydrothermal synthesis method, under same synthesis condition, the TS-1 molecular sieve membrane obtained by a microwave heating method has remarkably improved catalytic activity. The molecular sieve membrane synthesized by the invention is uniform and compact, is small in crystalline grains without macropore defects, and has high catalytic activity and repeatability. By adopting the microwave radiating heating for crystallization, the synthesis time is greatly shortened and the property of the synthesized molecular sieve membrane is remarkably improved. The synthesized molecular sieve membrane has higher repeatability, is beneficial to lowering the cost, and is suitable to industry expanding.

Description

technical field [0001] The invention discloses a method for preparing a titanium-silicon molecular sieve membrane by heating with microwave radiation, which belongs to the technical field of molecular sieve membrane synthesis, and specifically relates to the technical field of a molecular sieve membrane synthesis method, in particular, a method for preparing high-performance titanium-silicon by microwave radiation heating and crystallization TS-1 molecular sieve membrane method. Background technique [0002] As a kind of inorganic membrane, molecular sieve membrane has unique advantages, such as high selectivity in gas separation, variety of species, and catalytic activity itself, which makes it suitable for gas separation, shape-selective catalysis, membrane separation and membrane reaction. It has a good application prospect in the field of devices and so on. In addition, molecular sieve membranes can also be used as the matrix of nanoscale materials to assemble atomic cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/08
Inventor 王晓东黄伟延静
Owner TAIYUAN UNIV OF TECH
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