Reduction of nox emmisions from gasoline engines

Details Reduction of nox emmisions from gasoline engines Reduction of nox emmisions from gasoline engines

F - Mech Eng,Light,Heat,Weapons

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F01N 3/20 (2006.01) C10L 1/18 (2006.01) C10L 1/30 (2006.01) C10L 10/02 (2006.01) F02B 1/04 (2006.01)

Patent

CA 2062552

Case EI-6324 REDUCTION OF NOx EMISSIONS FROM GASOLINE ENGINES Abstract of the Disclosure NOx emissions are reduced in two stages during operation of an engine equipped with an exhaust gas catalyst system. In the first stage, a reduction in NOx emissions is effected in the exhaust leaving the combustion chamber. In the second stage a further reduction in NOx emissions is effected in the exhaust passing through the exhaust catalyst system. Both of the two-stage reductions are brought about in the same way, namely (a) by use of a suitable fuel composition containing at least one fuel-soluble cyclopentadienyl manganese tricarbonyl compound in an amount equivalent to up to 1/32 gram of manganese per gallon of fuel; and b) by enhancing the NOx control activity of at least the catalyst by prior operation of the engine on such fuel composition, either intermittently or continuously. Such prior operation constitutes a run-in or conditioning stage of sufficient total duration (continuous or interrupted) so that substantial reductions in NOx emissions are thereafter continuously achieved in subsequent operations of the engine. The efficacy of the invention are demonstrated by conducting a fleet test involving 48 cars, each operated for 75,000 miles during the test. Dramatic reductions in NOxwere achieved. Moreover, no significant catalyst pluggage, or increase in exhaust gas back pressure, or adverse effect upon oxygen sensors were experienced in thefleet test.

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