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Zeolite-like membranes from nano-zeolitic particles

A zeolite-like, membrane layer technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve problems such as easy rupture, low flux thick zeolite layer, etc.

Inactive Publication Date: 2008-12-17
佛兰芒技术研究所 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of synthesis in several stages, leads to thick zeolite layers with relatively low flux, prone to rupture during thermal treatment of the membrane, as in Vroon, Keizer, Verweij, J.Member.Sci 14465-76 as described in (1998)

Method used

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  • Zeolite-like membranes from nano-zeolitic particles
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  • Zeolite-like membranes from nano-zeolitic particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Formation of zeolite-like membranes on porous supports according to the different steps of the above process:

[0049] a. Under stirring, prepare siliceous rock by hydrolysis of tetrapropylammonium hydroxide solution (concentration 40% by weight) in 80.24 g tetrapropylammonium hydroxide aqueous solution (commercially obtained from Acros, 98% purity) under stirring. -1 framework nano-sized particle solution. After hydrolysis, 78.33 g of water were added and stirring was continued for 24 hours. The size of the nano-sized particles is controlled by the synthesis conditions (in this embodiment, the size is 1.3 x 2.0 x 4.0 nm 3 ). 5 ml of this solution of nano-sized silicalite-1 particles was diluted with 15 ml of ethanol. Subsequently, 2 ml of a 10% by weight solution of the surfactant dodecyltrimethylammonium bromide (DTAB, commercially available from Acros, purity 99%) in ethanol was added to the diluted nanoplatelet solution while Stirring was continued for 5 minutes...

Embodiment 2

[0059] Another type of zeolite membrane is formed on a porous support according to different steps of the above process:

[0060] a. A nano-sized particle solution having a silicalite-1 framework was prepared in the same manner as in Example 1. 5 ml of this nanoplatelet solution was diluted with 15 ml of ethanol. Subsequently, 3 ml of a 10% by weight solution of the surfactant dodecyltrimethylammonium bromide (DTAB, commercially available from Acros, 99% pure) in ethanol was added to the diluted nanoplatelet solution while Stirring was continued for 5 minutes. In this example, 0.6 volumes of 10 wt% surfactant solution in ethanol, and 3 volumes of dilute ethanol were used per volume of nanoplatelet solution. The surfactant concentration was again significantly lower than that used to produce the zeogrid powder (see Example 1).

[0061] b. The mixture was aged for 6 days.

[0062] c. Dilute the mixture with ethanol to a ratio of 1:20. In the coating mixture, the surfactant ...

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Abstract

The present invention is related to a silicate-based microporous ceramic molecular sieve membrane with zeolite-like properties, comprising an ordered stack of nanometre-sized slab-shaped building blocks having zeolite framework. The invention is equally related to a method for producing a membrane of the invention. The method does not involve a hydrothermal treatment step, hence avoiding the formation of zeolite crystals.

Description

field of invention [0001] The present invention relates to supported microporous ceramic molecular sieve membranes and methods of making the same. The synthesis of these microporous membranes involves an ordered stack of regular nano-sized silicate-based particles with a zeolite framework. A particular advantage of this method of membrane synthesis is that it does not involve any hydrothermal treatment or other types of zeolite crystal growth processes. This novel membrane has remarkable application potential in molecular separation and catalytic and adsorption processes. Background technique [0002] The preparation of practical zeolite membranes has long been a goal of separation science. Zeolites have significant advantages: having a crystalline structure and defined pore size, having variable surface properties in terms of hydrophilic / organophilic properties and acidity, all related to the framework chemistry. This particular topology of zeolites together with their c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D67/00
CPCB01D67/0046B01D71/028B01J29/035B01J29/06B01J2229/64B82Y30/00B01D67/0095B01D2323/14B01J35/59B01D69/108
Inventor A·比尔肯霍德P·雅各布斯I·万克莱科姆J·马滕斯
Owner 佛兰芒技术研究所