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Membrane with a stable nanosized microstructure and method for producing same

A nano-scale, micro-structured technology, used in oxygen preparation, separation methods, chemical instruments and methods, etc., can solve the problems of short membrane life, chemical instability, and unsuitable membrane mass production.

Inactive Publication Date: 2010-08-04
DANMARKS TEKNISKE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0037] However, membranes in the prior art cannot form membranes with a good balance of ionic and electronic conductivity due to inherent limitations in the electron conductivity or ion conductivity of the materials used, thereby limiting the efficiency of the membranes.
On the other hand, the proposed materials showing a better balance are chemically unstable structures, which are not suitable for large-scale production of membranes due to their very short lifetimes.

Method used

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  • Membrane with a stable nanosized microstructure and method for producing same
  • Membrane with a stable nanosized microstructure and method for producing same
  • Membrane with a stable nanosized microstructure and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] A symmetrical flat membrane with an impregnated catalyst layer is obtained. structured as figure 1 shown.

[0089] The first step involves tape casting the first and second catalyst layers and the membrane layer.

[0090] Suspensions for tape casting were prepared by ball milling powders with polyvinylpyrrolidone (PVP), polyvinyl butyral (PVB) and EtOH+MEK as additives. After particle size control, the suspension was cast with a double doctor blade system and the cast tape was subsequently dried.

[0091] Catalyst precursor layer (layers 12 and 13): The suspension contains Fe22Cr. The raw thickness (greenthickness) is in the range of 50-70 μm. The sintered porosity of the layer is about 50%, and the pore diameter is in the range of 1-2 μm.

[0092] Membrane layer (layer 11): the suspension contains Ce 0.9 Gd 0.1 o 2-δ (CGO10) powder and 1vol% Cr 2 o 3 . The raw thickness of the foil is approximately 25 μm. The sintered density of the layer is greater than 96...

Embodiment 2

[0100] The film was obtained as described in Example 1, except that there was an intermediate layer comprising metal and some cerium oxide to ensure better adhesion between the film and the metal layer. Its structure is in figure 2 shown in .

[0101] The first step involves tape casting the metal-containing layers (25 and 26), the intermediate layers (23 and 24) and the film layer (22).

[0102] Suspensions for tape casting were prepared and shaped as described in Example 1.

[0103] Metal support layers (25 and 26): The suspension contains Fe22Cr. The unprocessed thickness is in the range of 50 to 70 μm. The sintered porosity of the layer is about 50%, and the pore diameter is in the range of 3-4 μm.

[0104] Middle catalyst precursor layer (23 and 24): The suspension contained 90 vol% Fe22Cr and 10 vol% CGO10. The raw thickness is in the range of 25 μm. The sintered porosity of the layer is about 50%, and the pore diameter is in the range of 1-2 μm.

[0105]Film lay...

Embodiment 3

[0112] Membranes were obtained as described in Example 1, except that there was a thick support layer, ie an asymmetric membrane structure. Its structure is in image 3 shown in .

[0113] The first step involved tape casting two different metal-containing layers (~40 μm and 400 μm, respectively), and a film layer.

[0114] Suspensions for tape casting were prepared and shaped as described in Example 1.

[0115] Metal Support Layer and Catalyst Precursor Layer (Layer 35): The suspension contained 95 vol% Fe22Cr and 5 vol% CGO10. The raw thickness is in the range of 400 μm. The sintered porosity of the layer is about 50%, and the pore size is in the range of 4 μm.

[0116] Catalyst precursor layer (layer 36): The suspension contained 95 vol% Fe22Cr and 5 vol% CGO10. The raw thickness is in the range of 40 μm. The sintered porosity of the layer is about 40%, and the pore size is in the range of 3 μm.

[0117] Layer 3 (membrane layer - layer 34): the suspension contains CG...

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Abstract

The present invention provides a membrane, comprising in this order a first catalyst layer, an electronically and ionically conducting layer having a nanosized microstructure, and a second catalyst layer, characterized in that the electronically and ionically conducting layer is formed from an electrolyte material, a grain growth inhibitor and / or grain boundary modifier, and a method for producing same.

Description

technical field [0001] The invention provides a stable film with nano-sized microstructure and a preparation method thereof. The membrane is particularly suitable as a gas separation membrane. Background technique [0002] Generally, separation membranes are made of various inorganic or organic materials including ceramics, metals and polymers. For example, ceramic structures are oxygen ion conductors and are suitable for causing selective permeation of oxygen ions at high temperatures (eg, temperatures of about 500° C. or higher). Thus, a membrane comprising at least one layer of the above-mentioned ceramic material is suitable for separating oxygen from an oxygen-containing gas mixture. [0003] More specifically, it has been proposed to coat a catalyst layer on both sides of a ceramic membrane structure and connect the catalyst layer to the outside. On one side of the membrane, the oxygen partial pressure is adjusted to be lower than the oxygen partial pressure on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D53/22C01B13/02
CPCC01B13/0255B01J37/0219B01D53/228B01D2325/10B01D67/0046B01J35/023B01J23/86B01J23/002B01J23/83B01D2313/42B01J23/8892B01D53/8668B01J35/0033B01D71/024B01D69/145B01D2257/7022B01J37/0244B01D69/10B01J35/065B01J2523/00B01J35/33B01J35/59B01J35/40B01J2523/24B01J2523/3706B01J2523/842B01J2523/845B01J2523/3712B01J2523/375B01J2523/847B01J2523/47B01J2523/56B01J2523/36B01J2523/48B01J2523/72
Inventor 彼得·霍尔沃·拉尔森瑟伦·林德罗特
Owner DANMARKS TEKNISKE UNIV
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