
The scandal surrounding VW has thrust nitric oxide (NOx) emissions from diesel vehicles into the limelight. Owing to the different engine technologies, these have always been higher than in gasoline-powered cars. On the other hand, diesel consumes less fuel. If a way can be found to «denitrify» diesel emissions efficiently, we would have an economical, clean engine. Researchers are thus working hard on optimizing the catalytic converter technology for diesel.
http://www.sciencedaily.com/releases/2015/10/151001095415.htm