Exhaust Emissions from a SI Engine Fueled with Pyrolysis Gas

M. Ratcliff, C. Baca-Overly, S. Deutch, C. Feik, J. Graham, S. Phillips

Research output: Contribution to conferencePaperpeer-review

1 Scopus Citations


The regulated exhaust emissions from both natural and pyrolysis gas are compared. At a given actual air/fuel ratio, NOx from pyrolysis gas fueling was higher than from natural gas. However, because of the ability to operate the engine at higher air/fuel ratios on pyrolysis gas at comparable outputs, the differences in NOx emissions between the two fuels could be negligible. Regardless, the lowest measured NOx value at a load of 9 kw was still an order of magnitude higher than proposed US emissions standards for small generators. Further reductions in NOx emissions from SI engines will have to come from enhanced leanburn performance and/or addition of exhaust after treatment technologies. Alternatively, engines could run stoichiometrically with feedback control and a three-way exhaust catalyst as developed by the automotive industry.

Original languageAmerican English
Number of pages2
StatePublished - Mar 2002
Event224th ACS National Meeting - Orlando, FL, United States
Duration: 7 Apr 200211 Apr 2002


Conference224th ACS National Meeting
Country/TerritoryUnited States
CityOrlando, FL

NREL Publication Number

  • NREL/CP-510-32630


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