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BlueTEC engine technology reduces nitrogen oxides after combustion in the exhaust gas by more than 80 percent by means of the aqueous solution AdBlue. This standardised fluid consists of approximately two-thirds demineralised water and one third synthetic urea. AdBlue is injected extremely finely into the exhaust gas by means of an electronically controlled metering unit and is subsequently swirled around in the flow of exhaust gas. The heat converts the AdBlue into ammonia. In the downstream SCR catalytic converter, nitrogen and ammonia are converted into harmless water and nitrogen by means of a chemical catalytic reaction.
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