Abstract
The effects of formulation and aging on the dynamic oxygen storage capacity (OSC) of three-way catalysts (TWC) were determined by surface redox reaction using CO and O 2 pulses. The OSC of the precious metal (PM) catalysts after aging at 900°C was negligibly small. Addition of CeO 2 to the PM catalysts significantly enhanced the catalyst OSC after similar pretreatment, but addition of NiO enhanced the catalyst OSC only under mild thermal pretreatment. The presence of 20 ppm SO 2 did not affect the OSC of PM-only catalysts but adversely affected the OSC of catalysts containing CeO 2 or NiO. The OSC loss of a vehicle-aged TWC as well as PM catalysts aged in a simulated automotive exhaust environment appeared unaffected by the Pb and P present in the exhaust from unleaded gasoline but depended on sintering and exposure to SO 2.
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