52_100_Lecture_10_25_07

52_100_Lecture_10_25_07 - Octane Rating Compound Octane...

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10/24/2007 1 Compound Octane Rating Octane -20 Heptane 0 Octane Rating Regular Gasoline 87 Premium Gasoline 93 2,2,4-trimethylpentane 100 Ethanol 105 Methanol 105 Benzene 105 Methyl tert -butyl ether 115 Ethyl tert -butyl ether 118 Increasing Octane Ratings As automobile engines became more powerful, drivers wanted better octane ratings for better performance. Catalytic processes were too expensive in the early days. 1922 Thomas Midgley, working at GM discovered that adding 0.1% of tetraethyllead to a gallon of gas increased octane ratings by 10 to 15 points.
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10/24/2007 2 Automobiles and Pollution Ideal combustion would only produce carbon dioxide, CO 2 and water, H 2 O. Realistically, an internal combustion reaction produces CO 2 , H 2 O, hydrocarbons (no combustion), carbon monoxide, CO (incomplete combustion), and other gases due to impurties. Sulfur produces sulfur dioxide, SO 2 and nitrogen produces various nitrogen oxides that result in pollution (smog and acid rain). The Catalytic Converter
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52_100_Lecture_10_25_07 - Octane Rating Compound Octane...

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