Process of elimination of exhaust gas emissions

摘要

The present invention relates to a regenerable catalyst composition suitable for entrapping SOx, a Diesel oxidation catalyst (DOC) or a catalyzed soot filter (CSF) comprising said catalyst composition. The invention furthermore relates to the use of said catalyst composition for adsorbing SOx as metal sulfate under lean conditions and desorbing accumulated SOx as SO2 under rich conditions. Such reversible SOx trap material is able to work under typical NOx trap operating conditions to prevent sulfur poisoning of NOx trap and can be regenerated under rich conditions of NOx trap operation at 300-450 DEG C. The platinum group metal free (PGM-free) regenerable catalyst composition substrate is suitable for entrapping SOx having the general structure Cu/ A oxide whereby A oxide represents SiO2, Zr-SiO2, Al2O3, TiO2-Al2O3, ZrO2 and In2O3 and mixtures thereof. For irreversible SOx trap, which can collect SOx under lean conditions and can be regenerated only at elevated temperatures in a separate mode of operation, the systems containing praseodymia, zirconiapraseodymia and mixed manganese-yttria and mixtures thereof have shown to be an effective material for SOx removal.