The current state of research on automotive lean NOx catalysis

A predominant challenge to both industrial and academic research institutions is the selective reduction of NOx during lean exhaust conditions. Despite a proliferation of publications, papers and reviews, a large number of catalysts fall short of a credible and consistent diesel application. Herein are reviewed systems designed specifically with the goal of assisting researchers in their assessment of catalytic performance. By way of conclusion, three principal types of catalysts active for HC-SCR are discussed.