Ethanol and the Environment Reduction of Exhaust Emissions
- Slides: 12
Ethanol and the Environment
Reduction of Exhaust Emissions § Ethanol burns cleaner and is more efficient than gasoline – reducing carbon monoxide released into the atmosphere
Exhaust § Ethanol contains oxygen which provides a cleaner burn § Gasoline contains many hydrocarbons, some of which are known to be cancer causing agents
§ The release of hydrocarbons results in smog § The following pictures were taken from the same angle in Mexico City showing effects of smog No Smog Low Smog High Smog
Exhaust § These hydrocarbons are released into the atmosphere through exhaust and when refueling the vehicle § The release of hydrocarbons is greatly reduced when ethanol is mixed with the gasoline
Ozone Pollution § According to the American Coalition for ethanol: “Ozone is formed in air when hydrocarbons, carbon monoxide or nitrogen oxides react in the presence of sunlight and heat”. § “Ground level ozone causes human respiratory stress, and damages many plants, significantly reducing farm crop yields and the "health" of trees and other vegetation”.
Ozone § The ozone production when burning ethanol is less than the ozone released when burning gasoline
Aldehyde Emission § Ethanol combustion does increase aldehyde emission § Some forms of aldehydes are suspected to be cancer causing § Catalytic converters on cars are designed to reduce aldehyde emission
Carbon Monoxide (CO) § A colorless, odorless, toxic gas formed as a product of incomplete combustion of carbon. § Using ethanol-blended fuels will reduce the amount of CO released into the air.
Carbon Dioxide (CO 2) § A heavy, colorless gas that does not support combustion § Excess carbon dioxide may contribute to global warming § Ethanol combustion results in near zero net CO 2 production because the gas that is released is offset by the gas that is consumed by plants grown for ethanol production
Carbon Dioxide
References § Argonne National Laboratory, Transportation Technology R&D Center http: //www. transportation. anl. gov/fuels/index. html
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