Here is another interesting tidbit I found on the subject.
<blockquote>
It turns out that, despite all the claims that ethanol is good for the environment, ethanol may be a net polluter in many ways. Ethanol does reduce carbon monoxide emissions because it is an "oxygenate," which means it adds oxygen to the fuel, converting the CO into CO2, carbon dioxide. (Seeing how CO is not greenhouse gas, our ethanol policies result in making more CO2; what would Al Gore say?) But on the question of hydrocarbons, ethanol appears to make things worse.
Alcohol's hydrogen bonds are weaker than those of water or even gasoline, making alcohol more likely to evaporate, both under high heat, and under normal temperatures. In scientific terms, this means ethanol and other alcohols have greater "volatility" than gasoline.
More volatile fuels send more hydrocarbons into the air, because less of the hydrocarbons will be burnt up in combustion, and more will simply evaporate and float into the air. Adding 10 percent of ethanol to a fuel mixture increases the volatility, sending more smog-causing hydrocarbons into the air. </blockquote>
<blockquote>
It turns out that, despite all the claims that ethanol is good for the environment, ethanol may be a net polluter in many ways. Ethanol does reduce carbon monoxide emissions because it is an "oxygenate," which means it adds oxygen to the fuel, converting the CO into CO2, carbon dioxide. (Seeing how CO is not greenhouse gas, our ethanol policies result in making more CO2; what would Al Gore say?) But on the question of hydrocarbons, ethanol appears to make things worse.
Alcohol's hydrogen bonds are weaker than those of water or even gasoline, making alcohol more likely to evaporate, both under high heat, and under normal temperatures. In scientific terms, this means ethanol and other alcohols have greater "volatility" than gasoline.
More volatile fuels send more hydrocarbons into the air, because less of the hydrocarbons will be burnt up in combustion, and more will simply evaporate and float into the air. Adding 10 percent of ethanol to a fuel mixture increases the volatility, sending more smog-causing hydrocarbons into the air. </blockquote>
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