Engine dynamometer experiments: Platinum emissions from differently aged three-way catalytic converters
Depending on the operating conditions and the age of the converter, mean platinum emissions ranged from 7 to 123 ng m-3 corresponding to emission factors between 9 and 124 ng km-1. There were no statistically significant differences between the four converter brands tested. The data from new (12-90nm km-1) and old catalytic converters (9-26 ng km-1) installed on a medium-powered gasoline engine (1.8 l 66 kW) showed a tendency towards decreasing platinum emission with increasing use. The platinum emissions increased with rising simulated speed and exhaust temperature. The lowest mean emission from new converters (12 ng km-1) was found at a constant speed of 80 km h-1, the highest (90 ng km-1) at 130 km h-1.