The paper deals with problems arising on the one hand from aplying diesel oxidation catalyst for minimizing HC emission at low exhaust gas temperatures prevailing in the European city driving cycle and on the other hand in preventing sulphate formation in the oxidation catalyst at higher temperatures as they appear e.g. in the ECE R49 13-mode certification cycle. The main parameters influencing the catalyst efficiency - exhaust gas temperature level, sulphur content in the fuel and catalyst specifications - are discussed and new solutions to fulfill the conflicting requirements are presented. The use of a highly active catalyst for exhaust gas treatment only up to the temperature limit of sulphates formation and by-passing it in the high temperature range appears to be a viable solution. As a result of this strategy, the oxidation catalyst is applicable in a wide exhaust gas temperature range from 150 up to 550 degrees Celsius with negligible sulphate emissions and high conversion efficiencies of the particulate soluble organic fraction and of gaseous emissions HC, CO, aldehydes and odour.
Diesel Oxidation Catalyst Application Strategies with Special Emphasis on Odour Reduction
Sae Technical Papers
International Fuels & Lubricants Meeting & Exposition ; 1994
1994-10-01
Aufsatz (Konferenz)
Englisch
Diesel oxidation catalyst application strategies with emphasis on odour reduction
Kraftfahrwesen | 1994
|Exhaust odour reductions with a pre-catalyst system in an alcohol diesel engine
Kraftfahrwesen | 1993
|93EL025 Exhaust Odour Reductions with a Pre-catalyst System in an Alcohol diesel Engine
British Library Conference Proceedings | 1993
|93EL025 Exhaust Odour Reductions with a Pre-catalyst System in an Alcohol Diesel Engine
British Library Conference Proceedings | 1993
|A Diesel Oxidation Catalyst for Exhaust Emissions Reduction
British Library Conference Proceedings | 1993
|