Ag/Al2O3 was studied as a HC-SCR (Hydrocarbon - Selective Catalytic Reduction) catalyst for diesel application[1, 2 and 3]. Performance required of (or from) this catalyst is high NOx conversion with high thermal durability and sulfur resistance. Also low HC slip is desired. The Ag/Al2O3 system was improved by addition of additives.In the diesel 13-mode (Japan) evaluation, improved Ag/Al2O3 catalyst showed higher de-NOx activity (>50%) compared to the original when fresh. Improved Al2O3 catalyst showed smaller hysteresis of de-NOx activity between ramping up and down the temperature and smaller amount of HC slip.To study the improvement effect, interactions between the HC and catalyst were investigated by TG/DTA-MS (define) and FT-IR (define). TG/DTA measurement results showed that HC/O2 reaction was restrained in the improved catalyst. These results suggest that there was sufficient of HC for NOx reduction on the improved catalyst.
Development of deNOx Catalyst Based on Ag/Al2O3 Catalyst for Diesel Applications
Sae Technical Papers
Spring Fuels & Lubricants Meeting & Exhibition ; 2002
2002-05-06
Conference paper
English
Development of deNOx catalyst based on Ag/Al2O3 catalyst for diesel applications
Automotive engineering | 2001
|Experimental study on DeNOx performance by plasma-catalyst ( Ag,Au/Al2O3 ) system
Automotive engineering | 2002
|Experimental Study on DeNOx Performance by Plasma-Catalyst (Ag, Au/Al2O3) System
SAE Technical Papers | 2002
|Gasoline Direct Injection without DeNOx-Catalyst?
British Library Conference Proceedings | 2002
|A concept of plasma assisted catalyst system using a DeNOx catalyst for an automobile diesel engine
Automotive engineering | 2004
|