Evaluating carbon emissions reduction by use of natural gas as engine fuel

Paola Helena Barros Zárante, José Ricardo Sodré*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The exhaust emissions of carbon monoxide (CO) and carbon dioxide (CO2) from a natural gas fuelled spark ignition engine have been evaluated. A production, four-cylinder, eight-valve, 1.4-l, flexible fuel engine equipped with a commercial natural gas kit was tested in a bench dynamometer. The tests were carried out simulating the standard emission test cycle U.S. FTP-75. The results demonstrate that natural gas substantially reduces exhaust CO emissions in comparison with gasoline, falling below current regulated limit even without use of catalytic converter. Use of natural gas also reduced CO2 emissions to a level below the average of European fleet.

Original languageEnglish
Pages (from-to)216-220
Number of pages5
JournalJournal of Natural Gas Science and Engineering
Issue number6
Publication statusPublished - 1 Dec 2009


  • Carbon dioxide
  • Carbon monoxide
  • Emissions
  • Greenhouse gases
  • Internal combustion engine
  • Natural gas


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