The Dirt on Diesels

Cleaning up dirty diesels isn’t easy, but there are technologies available and new ones in the works which will reduce ozone-forming air pollution emitted from diesel engines in the form of nitrogen oxides (NOx). Because diesel cars and trucks are actually 30% more fuel efficient than vehicles fueled by gasoline, thereby burning less fuel, they can actually be better for the environment if their emissions are cleaned up using diesel particulate filters (to reduce particulate matter) and selective catalytic reduction (SCR).

In an effort to bring more innovative, fuel efficient clean diesel vehicles to the American marketplace, the EPA has issued a set of guidelines on emission certification procedures for on-road diesels that use SCR technology.

SCR reduces NOx in emissions by using a specially coated catalyst with a “reducing agent” such as ammonia or urea to turn NOx into harmless nitrogen and water.

According to the EPA, manufacturers of SCR technology will need to gain approval according to the guidelines in order to receive verification from the EPA. The technologies must take into account driver warning systems and inducement, system durability and reliability, and reducing agent quality and availability.

See the Source:
EPA – March 27, 2007

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More about low-temp selective catalytic reduction (SCR) technology from CleanAIR Systems