Method for reducing pollution emissions from a diesel engine
AssigneePlatinum Plus, Inc.
InventorsJeremy D. Peter-Hoblyn, James M. Valentine, W. Robert Epperly, Barry N. Sprague
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Abstract
The invention presented relates to a method for reducing the emission of nitrogen oxides from a diesel engine without significant loss of fuel efficiency and without significant increases in carbon monoxide and hydrocarbon emissions. The method involves preparing a diesel engine such that the injection timing thereof is set at a point sufficient to obtain reductions in the nitrogen oxides emissions from the engine; and firing the diesel engine with a diesel fuel having admixed therein an additive which comprises a fuel soluble organometallic platinum group metal coordination composition.
Claims12
A method for increasing the combustion efficiency of a diesel engine comprising
- a) preparing a diesel engine such that the injection timing thereof is set before top dead center at a level sufficient to obtain reductions in the nitrogen oxides emissions from the engine;
- and
- b) firing the diesel engine with a diesel fuel having admixed therein an additive which comprises a fuel soluble organometallic platinum group metal coordination composition selected from the group consisting of
- i) a composition of the general formula
- L.sup.1 PtR.sup.1 R.sup.2
- wherein L.sup.1 is either a single cyclic polyolefin or nitrogenous bidentate ligand or a pair of nitrogenous or acetylenic monodentate ligands;
- and R.sup.1 and R.sup.2 are each, independently, substituted or unsubstituted methyl, benzyl, aryl, cyclooc-tadiene or pentamethyl cyclopentadiene;
- ii) a composition of the general formula
- L.sup.2 M.sup.1 R.sup.3
- wherein L.sup.2 is either a single cyclic polyolefin or nitrogenous bidentate ligand or a pair of nitrogenous or acetylenic monodentate ligands;
- M.sup.1 is rhodium or iridium;
- and R.sup.3 is cyclooctadiene or pentamethyl cyclopentadiene;
- iii) a composition of the general formula
- L.sup.3 M.sup.2 (C.sub.r R.sup.4.sub.4)
- wherein L.sup.3 is either a single cyclic polyolefin or nitrogenous bidentate ligand or a pair of nitrogenous monodentate ligands;
- M.sup.2 is a platinum, palladium, rhodium or iridium;
- and R.sup.4 is COOR.sup.5, wherein R.sup.5 is hydrogen or alkyl having from 1 to 10 carbons;
- iv) a composition of the general formula
- L.sup.4 M.sup.3 (COOR.sup.6).sub.2
- or a dimer thereof, wherein L.sup.4 is a non-nitrogenous cyclic polyolefin ligand;
- M.sup.3 is platinum or iridium;
- and R.sup.6 is alkyl;
- v) a composition comprising the reaction product of L.sup.5 RhX and R.sup.7 MgX wherein L.sup.5 is a non-nitrogenous cyclic polyolefin ligand;
- R.sup.7 is methyl, benzyl, aryl, cyclooctadiene or pentamethyl cyclopentadiene;
- and X is a halide, wherein said platinum group metal compound is provided in an amount effective to supply from 0.01 to 1.0 parts per million of platinum group metal per part of fuel.
- vi) palladium acetylene complexes having the general formula ##STR4## wherein R.sup.8 is aryl or alkyl;
- and R.sup.9 is aryl;
- vii) metal allyl complexes having the general formula
- M.sup.r (C.sub.3 H.sub.5).sub.3
- wherein M.sup.4 is rhodium or iridium;
- viii) platinum (IV) compositions having the general formula
- R.sup.9.sub.3 PtR.sup.10
- wherein R.sup.9 is aryl, alkyl or mixtures thereof;
- and R.sup.10 is hydroxyl, acetylacetonate, cyclopentadiene or pentamethyl cyclopentadiene;
- and
- ix) a composition of the general formula
- L.sup.6 M.sup.5 R.sup.13
- wherein L.sup.6 is substituted or unsubstituted butadiene or cyclohexadiene;
- M.sup.5 is rhodium or iridium;
- and R.sup.13 is cyclopentadiene or pentamethyl cyclopentadiene, wherein said composition
- A. is resistant to breakdown under ambient temperatures;
- B. contains no more than about 500 ppm phosphorus, arsenic, antimony or halides;
- and
- C. has a partition ratio sufficient to maintain preferential solubility in the fuel.
Dependencies are inferred from the claim text.