Abstract
For the removal of NO x from exhausts containing excess oxygen, the selective catalytic reduction of NO x using hydrocarbons (HC-SCR) is highly interesting, especially for car applications (lean deNO x ). Two types of HC-SCR catalysts can be distinguished. High-temperature catalysts operate at temperatures above 573 K, showing moderate activity, and (mostly) low heat and poison resistance, but high N 2 selectivity. Low-temperature catalysts, usually based on Pt, operate between 473 and 573 K, showing opposite features: very high activity, as well as heat and poison resistance, and a low N 2 selectivity by forming N 2 O. The strategy for developing an active and stable deNOx system without N 2 O emission is the implementation of a separate catalytic function for N 2 O removal as a second stage.
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