Fuel and related compositions – Liquid fuels – Aluminum or heavy metal – other than lead – containing
Patent
1997-11-26
2000-04-18
Medley, Margaret
Fuel and related compositions
Liquid fuels
Aluminum or heavy metal, other than lead, containing
44359, 44361, 44363, 123 1A, 423235, 423236, 423237, 431 4, C10L 130, C10L 122
Patent
active
060510404
ABSTRACT:
A method improves the operation of a diesel engine through the use of a fuel additive, a diesel particulate trap and a NO.sub.x -reducing catalyst. The operation of the NO.sub.x -reducing catalyst is enhanced by the introduction of urea or like compound upstream of the catalyst at temperatures effective for non-catalytic NO.sub.x reduction and the generation of ammonia. The additive comprises fuel-soluble compositions of platinum group metal in effective amounts to lower the emissions of unburned hydrocarbons and carbon monoxide from the trap. The catalytic activity provided to the exhaust system by the fuel additive is selective and preferably reduces the oxidation of SO.sub.2 to SO.sub.3. The platinum group metal compositions are preferably added in amounts effective to provide concentrations of the metal in the fuel of less than 1 part per million (ppm). Lithium and/or sodium compositions can be used in amounts effective to reduce the trap regeneration temperature, e.g. concentrations to provide about 1 to 100 ppm lithium metal, and/or 1 to 30 ppm sodium metal.
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Clean Diesel Technologies, Inc.
Medley Margaret
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