There are some bottlenecks to reduce the exhaust gas of diesel engines by employing the current chemical control methods. Based on the emergence of non-thermal plasma-chemical technique for gas treatment

it supplies a promising and effective alternative way for the removal of NOx. The reaction mechanism is analyzed

and the experimental setup is introduced. The relationships among the purification rate and many correlative factors

and the formation of by-products are discussed. Although some difficulties are still remained

this technique shows a good prospect.