摘要:
The invention relates to a radial-flow annular catalyst body for installation in a muffler housing of a small-size engine, an exhaust system for a small-size engine and a method for producing the catalyst body. The catalyst body consists of a perforated metal foil. In a preferred embodiment, the perforations of the perforated metal foil are adjusted for sound reduction in such a way that the metal foil simultaneously assumes the function of a conventional reflection body. In a further preferred embodiment of the metal foil forming the catalyst body, webs for stiffening the metal foil are arranged between the perforations, which webs are adapted in such a way that they prevent any bulging of the metal foil in the installed state. In a further preferred embodiment, the ends of the metal foil are joined in a detachable interlocking connection. For producing the catalyst body in accordance with the invention, the catalyst body is bent in an annular way from a perforated metal foil strip. Thereafter the ends of the strip are joined by means of an interlocking connection. In a preferred production method, the perforated metal foil strip is cut, punched or broken from previously applied perforation points from endless merchandise. The production from endless merchandise allows a continuous coating process and especially considerable cost savings. The metal foil which can be adapted for sound reduction as a replacement for a conventional muffler unit also has favorable stability properties in addition to the catalytic effect. A conventional reflection body can be omitted because the perforations can be adapted for sound reduction and pollutant reduction. One component of a conventional exhaust system can thus be omitted.
摘要:
A metallic carrier for a catalytic converter or particle separator and the use of a metallic carrier for exhaust gas cleaning of internal combustion engines, especially diesel engines, is provided. The metallic carrier comprises an aluminum alloy having an aluminum content of 75 to 99.5 percent by mass. The metallic carrier helps achieve an advantageous reduction in the mass of the carrier and thermal capacity, as a result of which the light-off temperature is reached more rapidly. The reduction of mass and thermal capacity is not at the expense of a reduction in the catalytic carrier surface.