Abstract:
NO.sub.x 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 NO.sub.x emissions is effected in the exhaust leaving the combustion chamber. In the second stage a further reduction in NO.sub.x 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 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 NO.sub.x 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 NO.sub.x emissions are thereafter continuously achieved in subsequent operation of the engine. The efficacy of the invention was demonstrated by conducting a fleet test involving 48 cars, each operated for 75,000 miles during the test. Dramatic reductions in NO.sub. x were achieved. Moreover, no significant catalyst pluggage, or increase in exhaust gas back pressure, or adverse effect upon oxygen sensors were experienced in the fleet test.
Abstract:
The invention presented is a method for catalyzing fuel for powering internal combustion engines. The method comprises admixing with fuel an additive composition comprising at least one fuel-soluble platinum group metal compound in an amount effective to supply from 0.01 to 1.0 parts per million of platinum group metal per part of fuel.
Abstract:
A fuel composition containing a fuel additive which comprises a metal compound has been developed which fuel composition is stable upon storage. It has been discovered that a fuel additive comprising a metal compound and an oxime does not degrade a fuel, e.g. heating fuel oil, diesel fuel and the like, upon storage. Fuel additives containing metal compounds to function, e.g., as an agent to reduce soot formation and generally improve the combustion properties of the fuel may be added to fuels and stored without the build-up of gummy deposits and sludge in the storage container.
Abstract:
Gasoline compositions and additive mixtures containing compounds having the formula: ##STR1## wherein R.sub.1 -R.sub.6 are each independently selected from hydrogen or hydrocarbyl radicals in an amount sufficient to reduce exhaust hydrocarbon emissions from an internal combustion engine being operated on gasoline containing a cyclopentadienyl manganese antiknock. Preferred hydrocarbon exhaust emission reducing compounds are 1,3-dioxolane and the lower alkyl and alkenyl substituted derivatives thereof.
Abstract:
The present invention relates to a stabilized, combustion promoting fuel additive containing an iron (II) chelate and a picric acid/organic base complex. The invention further relates to stock solutions containing this additive, methods for producing the additive and fuels containing the additive.
Abstract:
The octane requirement increase of a gasoline fired internal combustion engine is suppressed by the incorporation in the gasoline fed to the engine of a minor amount of cerium (III) or cerium (IV) 2-ethylhexanoate.
Abstract:
The inhibition or prevention of octane requirement increase in a spark ignited internal combustion engine is achieved by introducing with the combustion charge a fuel composition containing an octane requirement increase-inhibiting amount of: (a) certain cyclomatic manganese compounds, (b) certain oil soluble aliphatic polyamines, and (c) oil of lubricating viscosity in certain range of weight ratio of (a):(b):(c).
Abstract:
An improved fuel composition comprising a major amount of hydrocarbons boiling in the gasoline boiling range, a minor amount of at least one hydrocarbon soluble compound of a metal selected from the group consisting of Group VIII metals and mixtures thereof capable of improving the octane number rating of the composition, a minor amount of at least one aliphatic alcohol containing from about 1 to about 8 carbon atoms per molecule; and a minor amount of at least one organic peroxy component containing from about 1 to about 20 carbon atoms per molecule wherein the compound and the combination of alcohol and peroxy component are present in mutually activating amounts to improve the octane number rating of the fuel composition.An improved method for fueling an internal combustion engine using the composition described above is also disclosed.
Abstract:
Gasoline compositions and additive mixtures of esters of nitrilotriformic acid, in amount sufficient to alleviate the plugging of certain catalysts being used in an engine exhaust system to lower the amount of undesirable constituents in exhaust gas from an engine being operated on gasoline containing a cyclopentadienyl manganese antiknock.
Abstract:
Gasoline compositions and additive mixtures of esters of nitrilotriacetic acid, in amount sufficient to alleviate the plugging of certain catalysts being used in an engine exhaust system to lower the amount of undesirable constituents in exhaust gas from an engine being operated on gasoline containing a cyclopentadienyl manganese antiknock.