SCR-Catalysts

SCR (selective catalytic reaction) exhaust gas aftertreatment systems are used to clean the exhaust gases of gas engines and ignition jet engines that run on biogas, natural gas, sewage gas, landfill gas or mine gas, as well as diesel engines. By adding a reducing agent (AdBlue), the nitrogen oxides (NOx) are selectively converted to nitrogen (N2) and water (H2O). With the aid of an SCR metering system, the reducing agent is fed from a tank to the injector and metered in toward a mixing device to achieve ideal mixing of ammonia with the exhaust gas stream in the exhaust tract. At the same time, the SCR catalyst selectively converts formaldehyde. A downstream barrier catalyst additionally converts carbon monoxide and prevents ammonia emissions.