| abstract |
Gasoline compositions and additive mixtures containing compounds having the formula <IMAGE> wherein R1, R2 and R3 are independently selected from hydrogen, hydrocarbyl radicals, and substituted hydrocarbyl radicals, and R4 is selected from hydrogen, hydrocarbyl radicals, substituted hydrocarbyl radicals, hydrocarbyloxy radicals, and hydrocarbyloxycarbonyl radicals, in an 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. |