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Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue [3]) is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF is an aqueous urea solution made with 32.5% urea and 67.5% deionized water .
SCR systems are now the preferred method for meeting Tier 4 Final and EURO 6 diesel emissions standards for heavy trucks, cars and light commercial vehicles. As a result, emissions of NOx, particulates, and hydrocarbons have been reduced by as much as 95% when compared with pre-emissions engines. [2]
Emissions from diesel vehicles are more harmful than those from petrol vehicles. [40] [41] [42] Diesel combustion exhaust is a source of atmospheric soot and fine particles, which is a component of the air pollution implicated in human cancer, [43] [44] heart and lung damage, [45] and mental functioning. [46]
GE Marine Announces Successful Testing of First 12V250 Marine Diesel Engine to Meet Upcoming EPA Tier 4i and IMO Tier III Emissions without Exhaust After-Treatment Breakthrough technology ...
BlueTEC is Mercedes-Benz Group's marketing name for engines equipped with advanced NO x reducing technology for vehicle emissions control in diesel-powered vehicles.The technology in BlueTec vehicles includes a selective catalytic reduction (SCR) system that uses diesel exhaust fluid, and a system of NOx adsorbers the automaker calls DeNO x, which uses an oxidizing catalytic converter and ...
Selective non-catalytic reduction (SNCR) is a method to lessen nitrogen oxide emissions in conventional power plants that burn biomass, waste and coal.The process involves injecting either ammonia or urea into the firebox of the boiler at a location where the flue gas is between 1,400 and 2,000 °F (760 and 1,090 °C) to react with the nitrogen oxides formed in the combustion process.
Soot and other particles from diesel engines worsen the particulate matter pollution in the air and are harmful to health. [8] New particulate filters can capture from 30% to greater than 95% of the harmful soot. [9] With an optimal diesel particulate filter (DPF), soot emissions may be decreased to 0.001 g/km or less. [10]
In August 2022, Fiat Chrysler — now known as Stellantis — paid nearly $300 million to resolve a multiyear criminal-fraud probe by the Justice Department over diesel-emissions.
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