Method for preparing metal fiber carrier for automobile exhaust purifier

A tail gas purifier and metal fiber technology, applied in chemical instruments and methods, separation methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as differences in thermal expansion coefficients, achieve high mechanical strength, and improve conversion Efficiency, Avoid Broken Effects

Inactive Publication Date: 2009-09-02
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But γ-Al 2 o 3 The thermal expansion coefficient of the coating and the cordierite substrate is quite different, so it is necessary

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1

[0019] Iron-chromium-aluminum metal fiber bundles with a wire diameter of 12 μm were prepared by the cluster drawing method, cut into short fibers with a length of 20 mm, and a cotton-floc-like porous metal fiber web was formed on a textile carding machine, and 100 grams of the fiber web was weighed. Put it into a prefabricated iron-chromium-aluminum cylinder with a size of Φ100×100mm, and put it into a vacuum sintering furnace for sintering. The vacuum degree is greater than 1×10 -3 Pa, sintered at 1150°C for 2 hours, and formed an integral porous carrier material after being released from the furnace. The test results are: 90% porosity, 2μm average pore size, and 20.6×104 specific surface area. The carrier is used in automobile exhaust gas purifiers.

Example Embodiment

[0020] Example 2

[0021] Iron-chromium-aluminum metal fiber bundles with a wire diameter of 20 μm were prepared by the cluster drawing method, cut into short fibers with a length of 23 mm, and a porous metal fiber web in the form of cotton flocs was formed on a textile carding machine. Weigh 100 grams of the fiber web, Put it into a prefabricated iron-chromium-aluminum cylinder with a size of Φ100×100mm, and put it into a vacuum sintering furnace for sintering. The vacuum degree is greater than 1×10 -3 Pa, sintered at 1170°C for 2 hours, and formed an integral porous carrier material after being released from the furnace. The test results were: 92% porosity, 2.4μm average pore size, and 12.6×104 specific surface area. The carrier is used in automobile exhaust gas purifiers.

Example Embodiment

[0022] Example 3

[0023] Iron-chromium-aluminum metal fiber bundles with a wire diameter of 25 μm were prepared by the cluster drawing method, cut into short fibers with a length of 26 mm, and a cotton-floc-like porous metal fiber web was formed on a textile card machine, and 100 grams of the fiber web was weighed. Put it into a prefabricated iron-chromium-aluminum cylinder with a size of Φ100×100mm, and put it into a vacuum sintering furnace for sintering. The vacuum degree is greater than 1×10 -3 Pa, sintered for 2.5 hours at 1200°C, and formed an integral porous carrier material after being released from the furnace. The test results were: 92.6% porosity, 2.7 μm average pore size, and 10.4×104 specific surface area. The carrier is used in automobile exhaust gas purifiers.

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Abstract

The invention discloses a method for preparing a metal fiber carrier for an automobile exhaust purifier. The process of the method comprises the following steps: preparing a nanometer aludirome fasciculus by using a bundle drawing method; cutting the aludirome fasciculus into short fibers; forming a cellucotton-shaped porous metal fiber mesh on a textile carding machine; filling the prepared cellucotton-shaped porou fiber mesh in an aludirome cylinder to form a carrier blank; and placing the carrier blank in a vacuum sintering furnace for sintering. The prepared metal fiber porous carrier has the characteristics of large specific surface, uniform aperture size and high porosity and mechanical strength. The excellent ventilation performance increases the effective area for air to pass through. The special porosity of the fiber carrier and the curved coherency of clearances change the travel path of automobile exhaust, prolong the area and time for the contact of the exhaust with a catalyst, improve the contact ratio and the pollutant conversion rate of the catalyst, reduce the back pressure of the catalytic cleaner, and contribute to the reduction of power loss of an engine.

Description

technical field [0001] The invention relates to a method for preparing a metal fiber carrier material, in particular to a method for preparing a metal fiber carrier for a motor vehicle exhaust purifier. Background technique [0002] With the progress of economy and society, the automobile industry develops rapidly and its quantity increases sharply, and the environmental pollution caused by automobile exhaust is also becoming more and more serious. Research shows: more than 40% of NO in big cities X , more than 80% of C0 and more than 70% of HC come from automobile exhaust. The main components in automobile exhaust are CO, NOx, SO 2 , HC, particulate matter, etc. Controlling tail gas pollution has become a topic of concern at home and abroad. Many countries have formulated various regulations and adopted many measures (such as Euro II and new Euro V standards) to strictly control vehicle exhaust emissions. China will make motor vehicle exhaust emissions in major cities ...

Claims

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Application Information

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IPC IPC(8): B01J35/06B01J23/86B01J21/02B01D53/94B01D53/50B01D53/62B01D53/72
Inventor 张健汤慧萍康新婷李广忠李亚宁李程
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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