As of October 1 this year the EU requires that emissions of nitrogen oxides be reduced by 30 percent in trucks and 50 percent in diesel-powered cars. In 2008 these regulations will be become more stringent in Europe, and even more so in the US. The technical solution chosen by nearly all automakers to meet the requirements was originally developed by the Lund University in Sweden. Now these researchers are working on methods to reduce nitrogen oxide emissions even more.
Emissions of nitrogen oxides from heavy trucks account for 40 percent of nitrogen oxide emissions in traffic. This is seen as a major environmental problem. Thanks to the so-called three-way catalytic converter, exhaust from gasoline-powered passenger cars is relatively clean. On the other hand, it has been more problematic to clean up the exhaust from diesel-powered vehicles.
To come to grips with the problem, scientists at Lund University have developed the so-called Urea Method. This entails injecting a urine substance, NH2(CO)NH2, into the exhaust fumes in a catalytic converter in the exhaust pipe. This is the method that is now to be used.
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