PROCESS FOR THE REMOVAL OF HARMFUL SUBSTANCES FROM EXHAUST GASES OF COMBUSTION ENGINES AND CATALYST FOR CARRYING OUT SAID PROCESS

摘要

The present invention relates to an integrated system for the treatment of exhaust gases, which preferably consists of at least one NO_x-storing component, at least one in situ ammonia-generating component, at least one ammonia-storing component and at least one ammonia (NH₃)-SCR-component, as well as to a process for the treatment of exhaust gas comprising at least the steps (i) storing of NO_x under lean exhaust gas conditions in at least one NO_x-storing component; (ii) in situ conversion of the stored NO_x to ammonia (NH₃) under rich exhaust gas conditions; (iii) storing of the ammonia (NH₃) in at least one NH₃-storing component under rich exhaust gas conditions as well as the (iv) reaction of NH₃ with NO_x under lean exhaust gas conditions. Thereby, the partial steps "storing of NO_x" and "conversion of NH₃ with NO_x" are carried out at least partially and/or temporarily simultaneously and/or parallelly. Furthermore, preferred catalysts are disclosed for carrying out the process.