Methane Dedicated Catalysts for Heavy-Duty Natural Gas Engines 961087
Three developmental catalytic converters, provided by different companies, were tested at the exhaust of a SI (spark ignition) NG (natural gas) engine for bus application. The catalysts were all based on noble metals: Pt (platinum), Pd (palladium), Rh (rhodium) and differed in size, metal loading and active phase composition.
Emission evaluation was performed according to the European ECE-R49 procedure (13 mode cycle), in stoichiometric and lean-burn conditions. In addition to regulated emission measurement, speciation of NMHC (non-methane hydrocarbons) and carbonyl compounds was performed.
The results showed that all the catalyst compositions considered allowed the European emission limits to be complied when the engine operated in stoichiometric conditions, while the overall best performance in the lean region was obtained on the catalyst with noble metal composition Pd:Rh=21:1. For NMHC and carbonyl compounds, not limited by regulation, conversion efficiency resulted always close to 100%.
About NOx (nitrogen oxides) emission in lean operation, the effect of the different noble metals on the catalyst conversion efficiency was investigated and compared with results obtained on cobalt-based de-NOx catalysts.
Citation: Corbo, P., Gambino, M., and Iannaccone, S., "Methane Dedicated Catalysts for Heavy-Duty Natural Gas Engines," SAE Technical Paper 961087, 1996, https://doi.org/10.4271/961087. Download Citation
Author(s):
P. Corbo, M. Gambino, S. Iannaccone
Affiliated:
Istituto Motori - CNR
Pages: 8
Event:
International Fuels & Lubricants Meeting & Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Alternative Fuel: Composition, Performance, Engines, and Systems-SP-1181
Related Topics:
Emissions measurement
Natural gas
Nitrogen oxides
Catalytic converters
Catalysts
Emissions
Hydrocarbons
Methane
Lean burn engines
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