Fuel compositions and additive mixtures for alleviation of exhaust gas catalyst plugging

Abstract

Gasoline compositions and additive mixtures of carboxymethoxysuccinic acid, its salts, esters, or other derivatives 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.

I claim: 
     
       1. As a composition of matter, a gasoline for an internal combustion engine comprising i. about 0.005 -10 grams of manganese per gallon as a cyclopentadienyl manganese tricarbonyl wherein said cyclopentadienyl group is a hydrocarbon group containing 5-17 carbon atoms, and   ii. amount sufficient to reduce the plugging of an exhaust gas catalyst of a compound having the general formula: ##STR6## wherein R is independently selected from hydrogen and hydrocarbyl radicals.   
     
     
       2. The composition of claim 1 wherein R is a lower alkyl group having from 1 to about 10 carbon atoms. 
     
     
       3. The composition of claim 1 wherein each R is methyl. 
     
     
       4. The composition of claim 1 wherein each R is ethyl. 
     
     
       5. The composition of claim 1 wherein said cyclopentadienyl manganese tricarbonyl is methylcyclopentadienyl manganese tricarbonyl. 
     
     
       6. Gasoline comprising i. a cyclopentadienyl manganese tricarbonyl wherein said cyclopentadienyl group is a hydrocarbon group containing 5-17 carbon atoms antiknock compound in an amount sufficient to improve the antiknock characteristics of said gasoline, and   ii. a compound in an amount sufficient to reduce the plugging of a noble metal exhaust gas catalyst, said compound having the general formula: ##STR7## wherein R is independently selected from hydrogen and a hydrocarbyl radical.   
     
     
       7. The gasoline of claim 6 wherein R is a lower alkyl group having from 1 to about 10 carbon atoms. 
     
     
       8. The gasoline of claim 6 wherein each R is methyl. 
     
     
       9. The gasoline of claim 6 wherein each R is ethyl. 
     
     
       10. The gasoline of claim 6 wherein R is an aryl group. 
     
     
       11. The gasoline of claim 10 wherein said aryl group is a phenyl group of up to 10 carbon atoms. 
     
     
       12. A substantially lead-free gasoline (for use with a noble metal exhaust gas purification catalyst, said gasoline comprising i. a cyclopentadienyl manganese tricarbonyl wherein said cyclopentadienyl group is a hydrocarbon group containing 5-17 carbon atoms antiknock in an amount sufficient to improve the antiknock characteristics of said gasoline, and   ii. a compound in an amount sufficient to reduce plugging of said noble metal exhaust gas purification catalyst, said compound having the general formula: ##STR8## wherein R is independently selected from hydrogen and hydrocarbyl radicals.   
     
     
       13. The gasoline of claim 12 wherein R is a lower alkyl group having from 1 to about 10 carbon atoms. 
     
     
       14. The gasoline of claim 12 wherein each R is methyl. 
     
     
       15. The gasoline of claim 12 wherein each R is ethyl. 
     
     
       16. The gasoline of claim 12 wherein said hydrocarbyl radical is an aryl group. 
     
     
       17. The gasoline of claim 16 wherein said aryl group is a phenyl group of up to about 10 carbon atoms. 
     
     
       18. A gasoline for use with a noble metal exhaust gas purification catalyst said gasoline comprising i. a cyclopentadienyl manganese tricarbonyl wherein said cyclopentadienyl group is a hydrocarbon group containing 5-17 carbon atoms antiknock in an amount sufficient to improve the antiknock characteristics of said gasoline, and   ii. a compound in an amount sufficient to reduce the plugging of said noble metal exhaust gas catalyst, said compound having the formula: ##STR9##   
     
     
       19. As a composition of matter an additive fluid for low lead or essentially lead-free gasoline comprising a cyclopentadienyl manganese tricarbonyl wherein said cyclopentadienyl group is a hydrocarbon group containing 5-17 carbon atoms antiknock, and an amount sufficient to reduce the plugging of an exhaust gas catalyst of a compound having the general formula: ##STR10## wherein R is independently selected from hydrogen and hydrocarbyl radicals. 
     
     
       20. The composition of claim 19 wherein R is a lower alkyl group having from 1 to about 10 carbon atoms. 
     
     
       21. The composition of claim 19 wherein each R is methyl. 
     
     
       22. The composition of claim 19 wherein each R is ethyl. 
     
     
       23. The composition of claim 19 wherein R is an aryl group. 
     
     
       24. The composition of claim 23 wherein said aryl group is a phenyl group of up to about 10 carbon atoms. 
     
     
       25. The composition of claim 19 wherein said cyclopentadienyl manganese tricarbonyl is methylcyclopentadienyl manganese tricarbonyl. 
     
     
       26. The composition of claim 25 wherein R is a lower alkyl group having from 1 to about 10 carbon atoms. 
     
     
       27. The composition of claim 26 wherein said lower alkyl group is ethyl. 
     
     
       28. The composition of claim 26 wherein said lower alkyl group is methyl. 
     
     
       29. The gasoline of claim 18 wherein said cyclopentadienyl manganese tricarbonyl is methylcyclopentadienyl manganese tricarbonyl. 
     
     
       30. The gasoline of claim 12 wherein said cyclopentadienyl manganese tricarbonyl is methylcyclopentadienyl manganese tricarbonyl. 
     
     
       31. The gasoline of claim 30 wherein R is a lower alkyl group having from 1 to about 10 carbon atoms. 
     
     
       32. The gasoline of claim 31 wherein said lower alkyl group is methyl. 
     
     
       33. The gasoline of claim 31 wherein said lower alkyl group is ethyl. 
     
     
       34. The gasoline of claim 6 wherein said cyclopentadienyl manganese tricarbonyl is methylcyclopentadienyl manganese tricarbonyl. 
     
     
       35. The gasoline of claim 34 wherein R is a lower alkyl group having from 1 to about 10 carbon atoms. 
     
     
       36. The gasoline of claim 35 wherein sid lower alkyl group is methyl. 
     
     
       37. The gasoline of claim 35 wherein said lower alkyl group is ethyl. 
     
     
       38. The composition of claim 5 wherein R is a lower alkyl group having from 1 to about 10 carbon atoms. 
     
     
       39. The composition of claim 38 wherein said lower alkyl group is ethyl. 
     
     
       40. The composition of claim 38 wherein said lower alkyl group is methyl.