This paper describes the function and application of the preoxidation, hydrolysis and SCR catalysts individually and as a combined system for urea SCR both in model gas and engine bench tests. Using the basic system and a non-optimized urea injection strategy 45% NOx conversion was achieved in the ESC engine test. Adding a preoxidation catalyst significantly improved the NOx conversion in the low temperature region of the engine mapping. NOx conversions over 75% can be achieved in the ESC test using this improved system. With a 50% reduced SCR catalyst volume still a NOx conversion of over 65% could be achieved. Tests after 200 hours engine aging show that the activity of the system is stable.
Improved SCR Systems for Heavy Duty Applications
Sae Technical Papers
SAE 2000 World Congress ; 2000
2000-03-06
Aufsatz (Konferenz)
Englisch
Improved SCR Systems for Heavy Duty Applications
British Library Conference Proceedings | 2000
|Improved SCR systems for heavy duty application
Kraftfahrwesen | 2000
|DCTs for heavy duty applications
Kraftfahrwesen | 2014
|