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Concept
Oxygenate
Summary
Oxygenated chemical compounds are hydrocarbons which contain at least one oxygen atom as a part of their chemical structure. The term often refers to oxygenated chemical compounds added to fuels. Oxygenates are usually employed as gasoline additives to reduce carbon monoxide and soot that is created during the burning of the fuel. Compounds related to soot, such as polyaromatic hydrocarbons (PAHs) and nitrated PAHs, are also reduced.
The most common oxygenates are either alcohols or ethers.
Alcohols:
Methanol (MeOH)
Ethanol (EtOH); see also Common ethanol fuel mixtures
Isopropyl alcohol (IPA)
n-Butanol (BuOH)
Gasoline grade tert-butanol (GTBA)
Ethers:
Methyl tert-butyl ether (MTBE)
tert-Amyl methyl ether (TAME)
tert-Hexyl methyl ether (THEME)
Ethyl tert-butyl ether (ETBE)
tert-Amyl ethyl ether (TAEE)
Diisopropyl ether (DIPE)
In the United States, the Environmental Protection Agency (EPA) had authority to mandate that minimum proportions of oxygenates be added to automotive gasoline on regional and seasonal basis from 1992 until 2006 in an attempt to reduce air pollution, in particular ground-level ozone and smog. As of 2023, the EPA continues to require the use of oxygenated gasoline in certain areas during winter to regulate carbon monoxide emissions; however, the programs to fulfill its conditions are implemented by the states. In addition to this North American automakers from 2006 onwards promoted a blend of 85% ethanol and 15% gasoline, marketed as E85, and their flex-fuel vehicles, e.g. GM's Live Green, Go Yellow campaign. US Corporate Average Fuel Economy (CAFE) standards give an artificial 54% fuel efficiency bonus to vehicles capable of running on 85% alcohol blends over vehicles not adapted to run on 85% alcohol blends. There is also alcohols' intrinsically cleaner combustion, however due to its lower energy density it is not capable of producing as much energy per gallon as gasoline. Much gasoline sold in the United States is blended with up to 10% of an oxygenating agent.
Official source
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