Abstract
The activity and durability of platinum-rhodium three-way catalysts for light-duty motor vehicle exhaust control are determined as a function of lead and phosphorus poisoning, thermal aging, and platinum-rhodium catalyst composition. The catalysts are sensitive to even trace levels of lead. The catalysts do not show sensitivity to trace levels of phosphorus found in current unleaded fuels. Catalyst deactivation by lead was decreased when catalysts were operated at higher temperatures, which resulted in lower lead accumulation on the catalyst. However, catalyst operation at elevated temperatures may increase the chance of thermal deactivation by overheating from the engine exhaust. (3 graphs, 18 references, 6 tables)
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