Exhaust duct with a catalytic wall, for internal combustion engines.

摘要

Exhaust pipe for catalytic treatment of the exhaust gases of an internal combustion engine, comprising a metal outer tube (1) enclosing a layer (4) of a catalyst in direct contact with the exhaust gases. According to the invention, the pipe furthermore comprises at least one inner tubular element (2), substantially coaxial with the said outer tube (1) and making with the latter at least one space (3), the inner surface of the said inner tube (2) being covered by the said layer (4) of catalyst. <IMAGE>