Oxygenates

Oxygenates are often used to increase both the octane rating and the volume of gasoline produced. Research shows that oxygenates have also been used to reduce carbon monoxide emissions and, to a lesser extent, hydrocarbon emissions, from vehicles.

However, adding oxygenates generally increases nitrogen oxide emissions. Consequently, most gasoline specifications set a maximum limit for oxygenates.

The use of ethers is preferred by oil refiners as they do not require any upgrade or adjustment in the logistics and distribution infrastructure for gasoline. Four types of ethers are commonly used:

In Morocco, for ethers with five or more carbon atoms, there is a maximum