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Method for forming an aluminosilicate-zeolite layer on a metal substrate, the coated substrate and the use thereof

A kind of technology of aluminosilicate and base material, applied to form aluminosilicate-zeolite-layer on metal base material, coated base material and its application field

Active Publication Date: 2012-02-29
SORTECH AG (DE)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This prior art goes beyond the above to operate with significantly substoichiometric aluminum in reaction dispersions

Method used

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  • Method for forming an aluminosilicate-zeolite layer on a metal substrate, the coated substrate and the use thereof
  • Method for forming an aluminosilicate-zeolite layer on a metal substrate, the coated substrate and the use thereof
  • Method for forming an aluminosilicate-zeolite layer on a metal substrate, the coated substrate and the use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] batch preparation

[0033] Reaction batches were prepared from both solutions.

[0034] Solution A:

[0035] Under stirring, 6 g of sodium metasilicate pentahydrate (Na 2 O 3 Si 5H 2 O, from Aldrich) add 70 g of H 2 O and stir until a clear solution is obtained. Then 42.35 g of triethanolamine (C 6 H 15 NO 3 , ≥99%, from Carl Roth GmbH) and stirred for about 30 minutes.

[0036] Solution B:

[0037] Combine 0.78 g NaOH (≥99%, from Carl Roth GmbH) with 49.34 g H 2 O mix. The mixture was stirred until a clear solution was obtained. Solution B was added to solution A with stirring and homogenized for about 30 minutes. The resulting reaction batch had a pH of 13.1 and the following composition expressed in oxide ratio: 1.0 SiO 2 : 1.2Na 2 O: 5.9C 6 H 15 NO 3 : 140H 2 O.

[0038] synthesis:

[0039] The aluminum support was purified with acetone, dried, placed in a stainless steel autoclave and covered with synthesis solution. The autoclave was closed a...

Embodiment 2

[0048] batch preparation

[0049] Reaction batches were prepared from both solutions.

[0050] Solution A:

[0051] Mix 7.5 g of sodium water glass (25.5 to 28.5% SiO with stirring) 2 , from AppliChem GmbH) add 75 g of H 2 O and stir until a clear solution is obtained. Then 10.29 g of triethanolamine (C 6 H 15 NO 3 , ≥99%, from Carl Roth GmbH). Homogenize for about 30 minutes.

[0052] Solution B:

[0053] 1.03 g NaOH (≥99% from Carl Roth GmbH) was added to 30.52 g H 2 O and stir until a clear solution is obtained. Solution B was added to solution A with stirring. Homogenize for about 30 minutes. The resulting reaction batch had a pH of 12.7 and the following composition expressed as oxide ratio: 1.0 SiO 2 : 0.66Na 2 O: 2.0C 6 H 15 NO 3 : 180H 2 O.

[0054] synthesis:

[0055] The hydrothermal synthesis was performed as described in Example 1.

[0056] analyze:

[0057] The hydrothermally treated aluminum supports were analyzed by X-ray powder diffraction...

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PUM

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Abstract

Described is a method for forming an aluminosilicate-zeolite layer on an aluminum-containing substrate which is transferred into an aqueous reaction dispersion containing silicon and optionally aluminum as network forming elements, wherein, irrespective of whether or not aluminum is present in the aqueous reaction dispersion, the molar ratio of the aluminum in the aqueous reaction dispersion, optionally 0, to the sum of said network forming elements contained in the aqueous reaction dispersion ranges between 0 and about 0.4, the aqueous reaction dispersion containing the aluminum-containing substrate is heated, aluminum is extracted from the aluminum-containing substrate for the aluminosilicate-zeolite formation process, and the layer of an aluminosilicate-zeolite is formed on the aluminum-containing substrate by in-situ crystallization.; Said method is characterized in that a layer of an aluminum-rich aluminosilicate-zeolite having an Si / Al ratio of lower than 5 is formed on the aluminum-containing substrate by introducing into the aqueous reaction dispersion a Si source in an amount sufficient for forming the Si / Al ratio of lower than 5, an Al source that meets the requirements of the molar deficit, and the aluminum-containing metal substrate, wherein the pH value of the aqueous reaction dispersion is alkalinized and the layer of the aluminum-rich aluminosilicate-zeolite is crystallized onto the aluminum-containing metal substrate. By means of said method, advantageous coatings made of an aluminum-rich aluminosilicate-zeolite are obtained on an aluminum-containing metal substrate.; This product can be used in advantageous applications, in particular in sorption-based application areas such as for heterogeneous catalysis, separation and cleaning processes, sorption heat pumps, in conjunction with immobilized catalysts and in microreaction techniques.

Description

technical field [0001] The present invention relates to a method for forming an aluminosilicate-zeolite-layer on an aluminum-containing metal substrate, the substrate being introduced into an aqueous reactive dispersion comprising silicon and optionally aluminum as reticulating elements, wherein, Regardless of the presence or absence of aluminum in the aqueous reactive dispersion, the molar ratio between the aluminum (optionally 0) in the aqueous reactive dispersion and the sum of the reticulating elements contained in the aqueous reactive dispersion is 0 to about 0.4, heating the aqueous reaction dispersion containing the aluminum-containing metal substrate and extracting aluminum from the aluminum-containing metal substrate for the aluminosilicate-zeolite-forming process and by in situ crystallization A layer of aluminosilicate-zeolite is formed on the aluminum-containing substrate. The present invention also relates to advantageous uses of the product of the process. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/12
CPCC23C18/1241C23C18/1212C23C22/66B01J20/165B01J20/3238C23C18/12C23C26/00B01J29/06
Inventor R·赫尔曼W·施维格J·鲍尔
Owner SORTECH AG (DE)