Catalyst for an exhaust aftertreatment system for internal combustion engines

The invention relates to a device for the catalytic treatment of exhaust gases of motor vehicles, which comprises a configured as a hollow cylinder catalyst substrate, an inlet-side and an outlet-side gas baffle and an outer wall, wherein the gas baffles enclose the catalyst substrate and the outlet-side gas baffle and the catalyst substrate form a first cavity in the exhaust gas stream may be introduced, which passes through the catalyst substrate and entering a second cavity which is surrounded by outer wall, gas baffles and catalyst substrate, wherein the outlet-side gas baffle has gas outlet opening and wherein the recessed part of the outlet-side gas baffle is beaded so that the catalyst substrate is fixed. Furthermore, the invention relates to a method for manufacturing the device according to the invention and their use and a process for purification of exhaust gases from motor vehicles.