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Metal carrier for automobile tail gas purifier catalyst and its prepn

A technology for catalyst metal, automobile exhaust, applied in catalyst carrier, chemical instrument and method, physical/chemical process catalyst, etc., can solve the problems of low mechanical strength, low thermal conductivity, large heat capacity, etc., achieve large catalytic reaction interface, The effect of large specific surface area and high purification rate

Inactive Publication Date: 2006-05-17
ANHUI ALAND NEW ENERGY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid growth of automobile ownership, the pollution of urban environment by automobile exhaust is becoming more and more serious. The effective measure to solve this problem is to install automobile exhaust purification mufflers. In automobile exhaust catalytic converters, the catalyst carrier is a hot research topic. One, the currently widely used honeycomb structure ceramic carrier has the disadvantages of large heat capacity, low thermal conductivity, and low mechanical strength. Therefore, people focus on the research of metal carriers, but the metal carrier still has problems such as too complicated molding process, which hinders its wide application. Application, in terms of solving the performance of metal carrier materials, some people in foreign countries adopt the method of rapid solidification and apply single-roller casting technology to prepare Fe-Cr-Al metal foil with a thickness of 20-60 μm, and its life is longer than that of the general method. A new alloy foil is obtained by covering both sides of the Fe-Cr-Al alloy with a thin layer of metal Al containing rare earths La and Le by rolling and bonding, which has good high temperature oxidation resistance and processing performance; in recent years There is a method of making a brush-shaped honeycomb structure metal carrier with a metal wire, and covering the surface with a metal coating such as Al, Zn or Sn. Complex and high production costs, so a reasonable, simple and economical metal carrier molding method has been developed, which is currently becoming a research hotspot in the field of catalytic carriers for automotive purifiers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1, the preparation process of three-dimensional reticulated metal foam carrier:

[0032] 1. The surface of polyurethane foam is treated with electroconductivity, and the electroless plating method is used for electroconduction treatment.

[0033] The process of electroless plating is: chemical degreasing → chemical roughening → sensitization → activation → electroless nickel plating,

[0034] Its chemical reaction is as follows:

[0035]

[0036]

[0037]

[0038] Chemical degreasing and chemical roughening adopt conventional acid-base treatment methods, sensitization and activation adopt one-step process, and the formula of colloidal palladium solution is: PdCl 2 0.2~0.5g / L, SnCl 2 2H 2 O 5~10g / L, NaCl 180g / L, NaSnO 3 0.5g / L, HCl 10ml / L, reaction temperature 15-25°C, pH 0.7-0.8;

[0039] The formula of electroless nickel plating solution is: NiSO 4 ·6H 2 O 10~25g / L, NaH 2 PO 2 ·H 2 O 24g / L, Na 3 C 6 h 5 o 7 2H 2 O 20~40g / L...

Embodiment 2

[0043] Embodiment 2, the preparation process of three-dimensional reticulated metal foam carrier:

[0044] 1. The surface of the polyurethane foam plastic is conductively treated, and the conductive treatment is coated with carbon-based conductive coatings. Commercially available conventional carbon-based conductive coatings are used, in which the carbon content is about 8-12%, and the particle diameter is generally 0.05- 3 μm, preferably 0.05-1 μm.

[0045] 2. electrodeposition is the same as embodiment 1. step 2

[0046] 3. Pyrolysis and reduction are the same as in Example 1. Step 3

Embodiment 3

[0047] Embodiment 3, the preparation process of three-dimensional reticulated metal foam carrier:

[0048] 1. Conduct conductive treatment on the surface of polyurethane foam plastics. Conductive treatment adopts vacuum vapor deposition (PVD) to obtain a conductive layer with a thickness of 0.05-1 μm, and the optimum value is 0.1 μm.

[0049] 2. electrodeposition is the same as embodiment 1. step 2

[0050] 3. Pyrolysis and reduction are the same as in Example 1. Step 3

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Abstract

The present invention relates to metal carrier for automobile tail gas purifier catalyst and its preparation process, and solves the technological problem in providing metal carrier with simple formation process and low production cost. The metal carrier features its 3D netted structure with skeleton of metal nickel or nickel coated copper, and has porosity of 30-98 %, pore number of 20-60 PPI and pore size of 0.5-3 mm. The preparation process includes the following steps: treating foamed polyurethane or polyether plastic via chemical plating or vacuum vapor depositing to coat carbon-base conducting material; electrically depositing matrix metal of nickel or copper coated nickel; and burning out foamed plastic base in a pyrolysis oven. The metal carrier is mainly used as carrier for automobile tail gas purifier catalyst.

Description

Technical field: [0001] The present invention relates to a novel high-efficiency automobile exhaust purifier metal carrier material and a preparation method thereof, in particular to a novel foamed metal carrier material which can be used as a high-efficiency automobile exhaust purifier and a preparation method thereof. The foamed metal carrier material has a unique three-dimensional The mesh honeycomb structure has the characteristics of high porosity, large specific surface area, small wind resistance, high temperature resistance, oxidation resistance, small heat capacity, high thermal conductivity and long life. The utility model belongs to the field of automobile exhaust purification. Background technique: [0002] With the rapid growth of automobile ownership, the pollution of urban environment by automobile exhaust is becoming more and more serious. The effective measure to solve this problem is to install automobile exhaust purification mufflers. In automobile exhaust...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01D53/94B01J35/04C22C1/08
Inventor 张正茂邢跃文
Owner ANHUI ALAND NEW ENERGY MATERIALS
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