Highly selective NOx reduction for diesel engine exhaust via an electrochemical system.

It is challenging to reduce the nitrogen oxides (NO x ) in diesel engine exhaust due to the inhibiting effect of excess oxygen. In this study, a novel electrochemical deNO x system was developed, which eliminated the need for additional reducing materials or a sophisticated controlling system as used in current diesel after-treatment techniques. The electrochemical system consisted of an electrochemical cell modified with NO x adsorbents and a diesel oxidation catalyst placed upstream of the cell. The system offers highly selective NO x reduction and a strong resistance to oxygen interference with almost zero emission of secondary pollutants. [ABSTRACT FROM AUTHOR]