Technical Innovations

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April 2007

Emitec catalyst for SCR NOx reduction

Diesel engines for commercial vehicle applications often operate under ignition pressures in excess of 200 bar (2900 psi)—250 bar (3625 psi) and higher are future possibilities—for optimal fuel consumption. Such high pressures lead to very high combustion chamber temperatures, which lead to oxides of nitrogen (NOx) generation. Engineers have learned to reduce NOx emissions by internal engine measures such as increasing the fuel injection pressure, using multiple injections, exhaust gas recirculation (EGR), etc. However, NOx must be reduced even further to comply with more stringent regulations in Europe, the U.S., and Japan. For that reason, there are many aftertreatment projects under way throughout the industry, including De-NOx systems from Emitec that are presently being developed and introduced for Mercedes-Benz trucks in Germany.
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