| abstract |
The invention relates to a catalyst for the purification of exhaust gases from diesel engines, which contains at least one zeolite and additionally at least one of the carrier oxides aluminum oxide, silicon dioxide, titanium dioxide and aluminum silicate and at least one of the noble metals platinum, palladium, rhodium and iridium. The catalyst is characterized in that the atoms of the noble metals have an average oxidation state of less than +2.5, have on average more than 3 metal ligands and less than 3 oxygen ligands and on the zeolites and carrier oxides in the form of crystallites have an average particle size between 1 and 6 nm. |