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In order to comply with the introduction of new emission limits, motorcycles have been equipped with electronic injection systems and three-way catalytic converters for emissions abatement. However, these converters produce unwanted reactions, such as the formation of ammonia. This paper was focused on ammonia emission reduction in motorcycles. To provide ammonia abatement, one SCR (Selective Catalytic Reduction) catalyst has been developed and installed in a fourstroke motorcycle in addition to the original one, a three way catalyst (TWC). SCR systems work by chemically reducing NOx (NO and NO2) to nitrogen (N2). This is an experimental research work conducted by the Research and Development Institute (Lactec) and the Umicore Automotive Catalysts. Regulated and unregulated emissions have been measured in a chassis dynamometer test cell.

The working principle of the Hydrocarbon (HC) trap has been tested and demonstrated for a wide range of applications. In the Brazilian automotive market, the flex fuel vehicles represents more than 84 % of 2013 domestic production. The sugar cane fuel is known in the automotive industry as E100. The local ethanol (ETOH) has a different specification than the ethanol composition from other countries, as to mention the 4.9 % of water content. There is a growing concern by the government about the increase of environmental pollution caused by the unburned ethanol during vehicle cold starts, since its combustion products like alcohols, aldehydes and ketones all have a potential for ozone formation. Because of this concern, a new legislation will be enforced in the near future to reduce the ETOH unburned emission. With the improvement of wash coat technologies and zeolite layer durability, one potential solution to address the cold start emissions is the use of an HC trap catalyst.