Process for the removal of harmful sustances 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 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 (NH 3 )-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 (NH 3 ) under rich exhaust gas conditions; (iii) storing of the ammonia (NH 3 ) in at least one NH 3 -storing component under rich exhaust gas conditions as well as the (iv) reaction of NH 3 with NO x under lean exhaust gas conditions. Thereby, the partial steps "storing of NO x " and "conversion of NH 3 with NO x " are carried out at least partially and/or temporarily simultaneously and/or parallelly. Furthermore, catalysts for carrying out the process are disclosed.