System for converting particulate matter in gasoline engine exhaust gases
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United States of America Patent
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-
Nov 12, 2002
Grant Date -
N/A
app pub date -
Aug 14, 2000
filing date -
Aug 14, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system for converting particulate matter in exhaust gases, which system comprises a stoichiometrically-operated engine and an exhaust system including a plasma generator for converting water vapor in the exhaust gases into an oxidant and a filter downstream of the plasma generator. A method for converting particulate matter (PM) in exhaust gases by using plasma-treated water vapor as an oxidant to convert PM trapped on a filter disposed in an exhaust system, and/or to oxidize NO and/or N.sub.2 to NO.sub.2, in which water vapor, PM, NO and N.sub.2 are present in the exhaust gases of a stoichiometrically-operated gasoline engine. The NO.sub.2 is then used to combust the PM. Experimentally, the conversion of a gaseous hydrocarbon using a plasma with and without water vapor present can be followed using mass spectrometry.
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