Vehicle tail-gas catalytic converter
A catalytic converter and automobile exhaust technology, which is applied in the field of automobile exhaust catalytic converters, can solve the problems of low thermal shock resistance and mechanical shock performance, limited specific surface area, insufficient oxidation resistance, etc., and achieve thermal shock resistance, mechanical shock, purification High efficiency and long service life
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[0022] In the preparation process of the automobile exhaust catalytic converter of the present invention, the process of combining the foamed metal carrier with the catalyst active component includes the processes of organic acid thermal corrosion, dip coating and sintering. Such a combination mode enables the formation of a multi-layer composite oxide film on the surface of the carrier, which enhances the firmness of the combination of the foamed metal carrier and the active component of the catalyst. Furthermore, the catalyst has better thermal shock resistance and mechanical shock performance, and the purification efficiency is improved, and the service life is extended.
[0023] Using stainless steel cylindrical shell 1, vibration damping pad 2, using the above-mentioned foamed metal as a carrier, and using the catalyst prepared by the above-mentioned method as an inner core to make an automobile exhaust catalytic converter, it has thermal shock and mechanical shock resista...
Embodiment 1
[0025] (1), preparation and pretreatment of foamed nickel metal: adopt known electroplating process to prepare thickness 1.5~3.0 millimeters, porosity 95~98%, the foamed nickel-chromium alloy of aperture 400 microns, its pore size distribution is uniform, without Sealed, no window, with certain mechanical properties and soft properties. Wherein the nickel-chromium alloy electroplating process and formula are as follows in Table 1:
[0026] Composition and process conditions
(g / L)
CrCl3 6H2O
50～80
NiCl2 6H2O
20～75
Formic acid (mL / L)
10～95
H3BO3
20～50
NaBr
40～90
pH value
1～4
temperature(℃)
20～60
Jk(A / dm2)
2～10
[0027] The anode uses an inert graphite electrode, and the cathode uses conductive foamed plastic. At the same time, in order to improve the quality of the coating, a small amount of additives are added, such as sodium dodecylsulfonate and coumarin. The content of...
Embodiment 2
[0033] (1), preparation and pretreatment of foamed nickel metal: with embodiment 1.
[0034] (2) Preparation of automobile exhaust catalytic converter: directly impregnate the foamed nickel-chromium alloy treated with organic acid for 1 to 5 hours into a mixture containing a certain proportion of soluble aluminum salt, zirconium salt, cerium salt, rhodium salt and appropriate amount of other components In the mixed solution divided, remove excess solvent, after drying, heat to 400-600°C and keep for 2-6 hours. After cooling to room temperature, organic acid corrosion, impregnation, drying and sintering are repeated to form a multi-layer composite oxide film on the surface of the carrier until the technical requirements are met.
[0035] A stainless steel cylindrical shell 1 and a vibration damping pad 2 are used, and the catalyst prepared by the above method is used as an inner core to make an automobile exhaust catalytic converter.
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Abstract
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