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Cellulated wiremesh carrier with alumina coat, and preparation method

A honeycomb metal, alumina coating technology, applied in catalyst carriers, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of expensive equipment, affecting the dispersion of catalytic active components, and complex preparation processes, and achieves a reduction in The effect of manufacturing cost, improving thermal shock resistance and mechanical vibration resistance, and simple molding process

Inactive Publication Date: 2007-10-10
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disadvantages: (1) The inside of the metal carrier is still stacked with corrugated metal foil and flat metal foil, rolled into an integral structure, the channels are independent, and there is no mass transfer and heat transfer in the radial direction; ( 2) Coating materials are easy to accumulate at the corners of the carrier, which affects the dispersion of catalytically active components; (3) The preparation process of the carrier is complicated and the price is relatively high
Disadvantages: (1) Due to the high temperature of the obtained coating, the specific surface area of ​​the coating is reduced, and part of the γ-Al in the coating 2 o 3 Converted to α-Al 2 o 3 (2) the preparation process operation is more complicated; (3) the equipment is more expensive, and needs to introduce gas Ar, H 2 and N 2 gas
Disadvantages: (1) The bonding strength between the carrier and the coating is low, and the coating is cracked, which is easy to cause the coating to peel off; (2) The pre-oxidation treatment of the metal carrier needs to be baked at 950°C for 10 hours, which consumes a lot of energy

Method used

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  • Cellulated wiremesh carrier with alumina coat, and preparation method
  • Cellulated wiremesh carrier with alumina coat, and preparation method
  • Cellulated wiremesh carrier with alumina coat, and preparation method

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Experimental program
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Effect test

Embodiment 1

[0044] According to the method of the present invention, an aluminum oxide coating with a thickness of 20 μm can be prepared on the surface of the wire mesh, and the formed honeycomb wire mesh carrier has a small volume, which can meet the needs of laboratory catalytic reactions.

[0045] Implementation preparation

[0046] Cut the wire mesh with 40 mesh to 1.5×1.5cm 2 The wire mesh is the flat wire mesh that forms the carrier of the honeycomb wire mesh, while the corrugated wire mesh is first cut into a flat wire mesh with a width of 1.5cm and a length of 2.5cm, and then this The wire mesh is placed in the abrasive tool and punched into a corrugated wire mesh with a tooth height of 2.0mm and a tooth spacing of 4.5mm;

[0047] Preparation of alumina coating

[0048] The first step, pretreatment of stainless steel wire mesh

[0049] Immerse 5 pieces of flat and 6 pieces of corrugated wire mesh required for molding in 50ml of 0.1mol / L hydrochloric acid solution for 30min, tak...

Embodiment 2

[0058] According to this method, an alumina coating with a thickness of 50 μm can be prepared on the surface of the wire mesh, and the volume of the formed honeycomb wire mesh carrier can meet the requirements of the metal carrier required by the automotive exhaust converter and small-scale reactions in the industry;

[0059] Implementation preparation

[0060] Cut the wire mesh with a mesh number of 20 to 2.5×3.5cm 2 The wire mesh is the flat wire mesh that forms the honeycomb wire mesh carrier, while the corrugated wire mesh is first cut into a flat wire mesh with a width of 2.5cm and a length of 4.5cm, and then this The wire mesh is placed in a self-made abrasive tool, and punched into a corrugated wire mesh with a tooth height of 3.0 mm and a tooth spacing of 5.0 mm.

[0061] The first step, pretreatment of stainless steel wire mesh

[0062] Immerse 11 pieces of flat and 12 pieces of corrugated wire mesh required for molding in 100ml of 0.1mol / L hydrochloric acid solutio...

Embodiment 3

[0070] According to this method, an alumina coating with a thickness of 80 μm can be prepared on the surface of the wire mesh, and the formed honeycomb wire mesh carrier has a large volume, which can meet the requirements of large-volume metal carriers required in industrial production.

[0071] Implementation preparation

[0072] Cut the wire mesh with a mesh number of 5 to 25.0×45.0cm 2 The wire mesh is the flat wire mesh that forms the carrier of the honeycomb wire mesh, while the corrugated wire mesh is first cut into a flat wire mesh with a width of 25.0cm and a length of 40.0cm, and then this The wire mesh is placed in a self-made abrasive tool, and punched into a corrugated wire mesh with a tooth height of 4.0mm and a tooth spacing of 4.5mm;

[0073] The first step, pretreatment of stainless steel wire mesh

[0074] Immerse 100 pieces of flat and 101 pieces of corrugated wire mesh required for molding into 5L 0.1mol / L hydrochloric acid solution for 30 minutes, take it...

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Abstract

A cellular metallic wire net carrier with coated aluminum oxide layer is composed of a metallic carrier and a coated layer and has an internal 3D through structure. Its preparing process includes such steps as preparing the planar metallic wire nets and corrugated metallic wire nets from stainless steel wire, pre-treating, preparing electric depositing liquid from gamma-Al2O3 powder, electric depositing to form a coated aluminum oxide layer on said metallic wire nets, stacking them in stagger mode, and binding them together by the strips of metallic wire net.

Description

technical field [0001] The present invention relates to the preparation of a metal carrier for catalysts, in particular to the preparation of a catalyst carrier suitable for use in gas-solid catalytic reactions in the field of environmental protection such as motor vehicle exhaust, fixed source exhaust and catalytic combustion. The invention also relates to the preparation of an aluminum oxide coating on the surface of a metal carrier, belonging to the technical field of metal carrier preparation. Background technique [0002] A monolithic structure carrier is a carrier with many parallel, continuous single channel structures, also often called a honeycomb carrier. Due to the special straight-through channel structure of the carrier, the honeycomb carrier has the characteristics of low pressure drop, uniform bed distribution, small catalyst wear, and simple amplification, which overcomes the problems of conventional granular carriers. [0003] The integral structural carrie...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J35/04
Inventor 全燮孙红张耀斌赵雅芝
Owner DALIAN UNIV OF TECH
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