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Method for making automobile tail gas three-element catalytic device with metal carrier

A three-way catalytic converter and metal carrier technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as small surface area of ​​metal carrier, poor adhesion performance, complex process, etc.

Inactive Publication Date: 2009-10-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems in the prior art that the process is complex, the alumina fiber growth process is relatively harsh, the cost is high, the adhesion performance is poor, and the surface area of ​​the metal carrier is small.

Method used

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  • Method for making automobile tail gas three-element catalytic device with metal carrier
  • Method for making automobile tail gas three-element catalytic device with metal carrier
  • Method for making automobile tail gas three-element catalytic device with metal carrier

Examples

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Embodiment 1

[0014] The micropores on the surface of FeCrAl metal foil adopt the electrochemical corrosion pore-making technology, that is, the intermittent and half-wave pulse energization methods are used, that is, the half-wave pulse is energized for 1 second and then power-off for n seconds, and the n value is 0-10. In the electrolyte of the corrosion inhibitor, uniform micropores are formed on the surface of the metal or metal coating through the process of pitting, passivation, re-pitting, and re-passivation. The electrolytic solution uses 3% hydrochloric acid + 1% hexamethylenetetramine, the experimental temperature is controlled at about 70°C, and the experimental current density is 0.8-1A / cm 2 Between, the power-on time is 60s. The surface morphology of the sample after corrosion is as follows: figure 1 shown. There are a large number of micropores on the surface of FeCrAl metal foil, and the micropores can be clearly divided into two levels. The size of the macropores is severa...

Embodiment 2

[0017] The surface microporosity of the FeCrAl metal foil is the same as in Example 1. After the above-mentioned treatment of FeCrAl metal foil surface corrodes to form micropores, the sol-gel thin film technology is used to prepare Al on the surface of FeCrAl stainless steel. 2 o 3 film. The preparation process of alumina sol-gel is as follows: first prepare 0.1mol / L Al(NO 3 ) 3 A mixed aqueous solution of the solution, and then add ammonia water dropwise to the solution and vigorously stir with a magnetic stirrer until the pH value of the solution is approximately equal to 10, and continue to stir with a magnetic stirrer for 2h to make the Al 3+ Complete reaction with ammonia water to produce Al(OH) 3 , you can get Al 2 o 3 colloidal solution. Thereafter, 3% polyvinyl alcohol was added to the colloidal solution, and it was heated in an 80° C. water bath for 1 hour to fully dissolve it. The surface morphology of FeCrAl metal foil is as follows: image 3 As shown, the...

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Abstract

A three-element catalyst device with metallic carrier for treating the tail gas of car is prepared through treating the surface of metallic foil to form a lot of micro or nano-holes, using the metallic foil to prepare Al2O3 film as metallic carrier by electric deposition or sol-gel method, immersing the carrier in catalyst solution, drying, and rolling.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a technology for preparing a metal carrier of a three-way catalytic converter for automobiles. Background technique [0002] Automobile exhaust three-way catalytic converter can significantly reduce exhaust emission pollution. After decades of development, the technology of the three-way catalytic converter using honeycomb ceramics as the catalyst carrier is becoming more and more mature, but a prominent problem in the further development of this technology is that the current automobile exhaust emissions (mainly hydrocarbons and nitrogen oxide compounds) 60-80% comes from within 1-3 minutes of starting the car, and the ceramic carrier has a large heat capacity and low thermal conductivity, and it is difficult to reach the catalytic temperature in a short time, so it cannot meet the above requirements. [0003] Compared with the ceramic carrier, the metal carrier has t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/44B01J37/025
Inventor 孔祥华何业东陈伟李林青段方苗张东升
Owner UNIV OF SCI & TECH BEIJING