Catalytic Aftertreatment of Vehicle Exhausts from Two-Stroke Motorcycles

The use of catalytic aftertreatment to reduce residual hydrocarbons and carbon monoxide from the exhaust stream of 2-stroke 2-wheel vehicles is reported. The impact of applying three different catalyst technologies to the exhaust streams of two motorcycles was examined. Mass emission and modal results generated from 50cc and 110cc motorcycles during the India Driving Cycle (IDC) were used to characterize catalyst performance. The results indicate that the effective implementation of catalytic aftertreatment to 2-stroke 2-wheel vehicles depends strongly on both catalyst formulation and the specific application. Catalysts can be formulated to possess desired selectivity allowing flexibility in meeting emissions standards.