PSI team finding offers way to improve performance of SCR catalysts

By mmillikin A common approach to reducing NOx emissions from diesel engines is the use of Selective Catalytic Reduction (SCR); the system converts NOx to nitrogen and water via the addition of ammonia. However, SCR only delivers satisfactory results at an exhaust gas temperature well above 200 ˚C. In a cold start, it takes a few minutes until the aftertreatment system is performing optimally. For the same reason, SCR can have reduced performance on cold winter days.

Now, a team at Switzerland’s Paul Scherrer Institut has used time-resolved X-ray absorption spectroscopy and transient experimentation to find that, depending on the temperature and

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