Catalytic unit for purification of combustion engine exhaust gases comprises self-cleaning spherical metal beads as active material and has a bottom gas-inlet

摘要

A catalytic unit housing (2) is packed with loose metallic spheres (3), and has a first retaining grid (7) and a bottom gas feed inlet. Independent claims are included for the use of spherical beads in catalytic units and for controlling the percussive effects so as to limit attrition, while maintaining the surfaces clean.