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Ceramic hollow fiber oxygen permeable membrane with catalyst supported on surface and manufacture method thereof

A surface loading and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of insufficient oxygen permeability of ceramic hollow fiber membranes and membrane systems. cost and operating costs increase

Active Publication Date: 2008-10-08
上海穗杉实业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, the oxygen permeability of ceramic hollow fiber membranes prepared by phase inversion-sintering technology is still not large enough. To achieve a higher oxygen transmission rate, the operating temperature must be increased, which will greatly increase the cost of the membrane system and operating costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] La0.6Sr0.4Co0.2Fe0.8O3 Hollow Fiber Membranes Supported by Ba0.5Sr0.5Co0.8Fe0.2O3-δ(BSCF)

[0079] La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) hollow fiber oxygen permeable membrane was prepared by phase inversion sintering method: in a 250ml jar, a certain amount of polyvinylpyrrolidone was dissolved in N-methylpyrrolidone solvent ( In NMP), add a certain amount of polyethersulfone (PESf) polymer, stir to make it completely dissolved, then add modified LSCF powder, stir vigorously for 48h to make it completely and evenly dispersed in the polymer solution to obtain ceramic polymer slurry ( Also known as casting solution), wherein the ratio of LSCF material to PESf polymer is 9:1, and the content of PVP dispersant is 0.5%. The uniformly stirred casting liquid was moved to the spinning stock tank, and then used for spinning the film after vacuum degassing for 2 hours. N at 10Kpa 2 Under pressure, the casting solution passes through the spinneret into the gel tank. The feed liquid ou...

Embodiment 2

[0083]La0.6Sr0.4Co0.2Fe0.8O3 / Ag Mixed Catalytic Support La0.6Sr0.4Co0.2Fe0.8O3 Hollow Fiber Membrane

[0084] La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) dense hollow fiber oxygen permeable membrane was prepared by the method of Example 1, with an outer diameter of 2.7mm. The hollow fiber membrane is soaked in 10% hydrochloric acid for 120min, and the LSCF composite oxide with an average particle size of 20nm and Ag or Ni powder with an average particle size of 30nm are mixed in a ratio of 1:1, and polyethersulfone is used as a binder, N- The methyl pyrrolidone solvent is used as a solvent to make a catalyst slurry, which is evenly coated on the outer surface of the LSCF hollow membrane. Then according to the sintering procedure of Example 1, after sintering at 1100 ° C for 5 hours, the LSCF / Ag or Ni mixed catalytically loaded La0.6Sr0.4Co0.2Fe0.8O3 hollow fiber oxygen permeable membrane is obtained, the thickness of the catalyst layer is 30000nm, and the rest of the operations are the same...

Embodiment 3

[0087] Bi 2 o 3 or Co 2 o 3 Catalytic Support La0.6Sr0.4Co0.2Fe0.8O3 Hollow Fiber Membrane

[0088] La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) dense hollow fiber oxygen-permeable membrane is prepared by the method of Example 1, with an outer diameter of 2.5mm, acid-etched with industrial hydrochloric acid, acid-etched for 50min, and Bi with an average particle size of 5000nm 2 o 3 or Co 2 o 3 Prepare the slurry and evenly coat it on the outer surface of the LSCF hollow membrane. The thickness of the catalyst layer is 500nm. Other operations are the same as in Example 1.

[0089] It was tested that the oxygen permeability at 850°C was 18.8 times higher than that of the original LSCF hollow fiber membrane.

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Abstract

The invention provides a ceramic hollow fiber oxygen permeable membrane with the surface loaded with catalyst and a preparation method thereof. A fore body of a hollow fiber ceramic oxygen permeable membrane with the external diameter that is less than 3mm is prepared through a phase transfer or an extrusion forming method, which is sintered to acquire a compact ceramic hollow fiber oxygen permeable membrane; the surface of the hollow fiber ceramic oxygen permeable membrane is processed with acid etching, which is then loaded with catalyst and is sintered once again, so that the loaded catalyst can be closely combined on the surface of the ceramic hollow fiber oxygen permeable membrane. After the area catalytic load, the speed rate of oxygen permeability of the hollow ceramic membrane is improved 2 to 80 times more than the membrane without the load, thus greatly reducing the oxygen permeable temperature of the ceramic membrane and improving the oxygen permeable stability of the ceramic membrane, while the stability and the mechanical strength of the hollow fiber membrane are not changed remarkably. The ceramic hollow fiber oxygen permeable membrane with the surface loaded with catalyst can be used for space division oxygen generation and a membrane reactor.

Description

technical field [0001] The invention belongs to the technical field of ceramic oxygen-permeable membranes, and in particular relates to a preparation method of an oxygen-permeable ceramic hollow fiber membrane loaded with a catalyst on the surface. Background technique [0002] Oxygen is an important chemical raw material. It is widely used in industrial production fields such as steelmaking, glass, aluminum industry, and chemical industry. It can reduce energy consumption and emissions when used in pure oxygen or oxygen-enriched combustion, which is important for environmental protection. In addition, it also has very important uses in some special fields such as aviation, military affairs, and medicine. [0003] However, technologies such as cryogenic rectification or pressure swing adsorption (PSA or VSA) currently used in air separation oxygen production have complex processes, high energy consumption and high cost. [0004] Membrane air separation oxygen production can...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D69/08B01J23/83B01J23/70B01J23/16
Inventor 谭小耀孟波王志刚杨乃涛
Owner 上海穗杉实业股份有限公司
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