Technical Paper
Enhancing a Catalyst Formulation for a Big Displacement Motorcycle for Future Emission Regulations
2014-11-11
2014-32-0029
Current catalytic formulations for motorcycles consist of so called three way catalysts (TWC) that are able to reduce the emissions of carbon monoxide (CO), nitrous oxides (NOx) and hydrocarbons (THC) below the regulatory emission limit. These catalysts mostly contain platinum (Pt), palladium (Pd) and rhodium (Rh), also called platinum group metals (PGM) in different ratios and concentrations. Another important component is the so-called oxygen storage material (OSC) that is compensating fluctuations in lambda during acceleration and deceleration. Currently existing catalyst formulations must be modified to fulfill the more stringent emission limits with simultaneous consideration of a more realistic test cycle. In this paper we will present the modification of an existing catalytic formulation for a 690 cm3 motorcycle from model year 2012. The motorcycle is equipped with a quick-change muffler to be able to compare different formulations in a simple way.