JoackODLad24 Nov 2019 10:28
All you needed to post was the last paragraph :
"After more than 30 years of research, Lambert concluded, there still are no good options for creating catalysts to treat gasoline engine exhaust that do not use platinum-group metals. The only real advance, she said, was the transition to palladium-rhodium and palladium-only catalysts enabled by the elimination of lead from gasoline."