Sulfur storage and release from automotive catalysts

An H/sub 2/S odor problem has appeared for certain vehicles fitted with modern three-way catalysts. A sulfur storageH/sub 2/S release mechanism is proposed as a source of the odor problem. The effects of various operating parameters on the release of H/sub 2/S are presented. Two methods of modifying three-way catalysts to minimize H/sub 2/S release while maintaining good catalyst performance and high temperature durability are demonstrated.