| abstract |
For the catalytic reduction of NOx in oxygen-containing exhaust gases using urea as a reducing agent, a combination component (6) consisting of evaporator, gas mixer and hydrolysis catalytic converter is used, which can be activated by connecting a pre-catalytic converter (3) close to the engine and / or by changing the catalytic coating of the combination component ( 6) - in addition to evaporation, flow mixing and catalytic hydrolysis - a significant NOx reduction activity is impressed, with which the reduction catalyst (7) connected downstream of the combination component (6) is relieved or completely replaced. <IMAGE> |