Ueno, K., Horimura, H., Iwasa, A., Kurasawa, Y. et al., "Development of Base Metal Catalyst and Its Compatibility Study for Motorcycle Applications," SAE Int. J. Engines 9(4):2451-2459, 2016, doi:10.4271/2016-32-0071.
We developed a copper catalyst using zero Platinum group metals (hereafter PGMs) to fit motorcycle specific emission gas environment. Though many research reports to develop catalyst without using PGMs that are precious and costly resources are available, no reports had proven Base Metal Catalyst development to meet actual emission regulation equivalent to PGM catalysts. Compared to conventional PGM catalysts, higher temperature is required to keep high catalytic conversion efficiency by utilizing properties of this Base Metal Catalyst. Thus, this Base Metal Catalyst is located in cross coupling position, though it is rare case in motorcycle. This catalyst location could cause negative impacts on engine knocking, engine performance and drivability. This time, to overcome such negative impacts we optimized whole exhaust system, including parts around catalyst. In this paper, we report our vehicle development with Base Metal Catalyst to fit current emission regulation, while meeting required features for real vehicle, including vehicle appearance, and noise regulation.