Catalyst for the removal of pollutants from exhaust gases of lean-burn engines with ruthenium as active metal

摘要

The invention relates to a catalyst for exhaust gas purification in lean-burn engines, wherein the Katlysator at least ZrO¶2¶ and / or Ce / Zr mixed oxide as a support material and ruthenium as the active metal alone or with at least one further active metal selected from the group of Precious metals, includes. The promoters used are rare-earth oxides and transition metals. The invention further comprises a process for exhaust gas purification of lean-burn engines in lean-lean and constantly lean operation, using a catalyst as defined above.