Recent Results for HC-SCR Using Ag-Alumina and Cu-Zeolites

Edward  Jobson, Mack /Volvo

New catalyst materials based on Cu-ZSM5 technology and Ag-Alumina have been developed for NOx reduction by diesel fuel. Kinetic investigations and full scale tests have been performed.
The results confirm a continued progress in materials development towards increased stability and improved hydrothermal stability. Fuel quality aspects are better understood. The inhibition of aromatics can be explained on a "mean field level". The promoting effect of hydrogen as make-up gas is observed, also in full scale tests, but not fully understood.

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