Browse Publications Technical Papers 2009-32-0158

Catalytic Coating for Effective Emission Reduction in a Small Motorcycle Application 2009-32-0158

This paper will present a comparison of different catalytic coatings especially designed for small motorcycle application with regard to activity, durability and precious metal costs. Since recent catalytic formulations for this application widely use rather expensive platinum (Pt) -rhodium (Rh) formulations, this paper will present data for less expensive coatings which use palladium (Pd) as the main or the only active precious metal compound. Besides the fresh catalytic activity the thermal and chemical aging stability will be compared for PtRh, PtPdRh and Pd-only formulations. We will show that also less expensive Pd-rich catalytic coatings can be used for an effective emission reduction of small motorcycles.
The presented data have been obtained by synthetic gas reactor testing using a simulated engine exhaust gas for coated catalysts as well as for thermally and chemically aged catalysts. Chemical aging was performed by impregnation of poisonous elements like Ca, Zn and P simulating a real life aging process; thermal aging was performed in an oven.
In addition, the activity of different formulations has been tested using a 125cc motorcycle, running the ECE R40 cold-start cycle which is used for the Euro 3 and China 3 emission regulation for motorcycles. These results will be correlated with the results of the synthetic gas reactor tests.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Influence of Phosphorous Poisoning on TWC Catalysts


View Details


Improvement of Thermal Resistance for Lean NOx Catalyst


View Details


Substrate Effects on Light-Off - Part I Thermal Energy Requirements


View Details