The Effect of Catalyst Ageing on the Composition of Gasoline Engine Hydrocarbon Emissions 910174
Twenty-three hydrocarbons were measured in the exhaust gases from a Volvo passenger car fitted with a 2.3 litre gasoline engine. Measurements were made in the absence of a catalyst, and in the presence of a fresh and an aged three-way catalyst, with particular attention being paid to the emission of benzene and other light aromatic compounds.
Loss of catalytic activity through ageing led to an increase in hydrocarbons of ∼ 200% from 0.22 to 0.62 g/mile. Loss of activity was most evident for certain compounds notably alkanes (paraffins) although large increases in aromatic emissions were also apparent; catalytic control of ethyne (acetylene) was, however, completely maintained by the aged catalyst. Thus the work reported here demonstrates the selective manner in which a catalyst operates depending upon the chemical structure of hydrocarbons, and how this influences catalyst performance loss via ageing.
Citation: Andersson, S., Frestad, A., Dempster, N., and Shore, P., "The Effect of Catalyst Ageing on the Composition of Gasoline Engine Hydrocarbon Emissions," SAE Technical Paper 910174, 1991, https://doi.org/10.4271/910174. Download Citation
S. Andersson, A. Frestad, N. M. Dempster, P. R. Shore
Emissionsteknik Surte, Sweden, Ricardo Consulting Engineers Ltd. Shoreham-by-Sea, England
International Congress & Exposition
Worldwide Emission Control Advancements-SP-0863, SAE 1991 Transactions - Fuels & Lubricants-V100-4