State two ways, other than the addition of lead compounds, that the octane rating of a fuel can be increased. - Leaving Cert Chemistry - Question 1(j) - 2003
Question 1(j)
State two ways, other than the addition of lead compounds, that the octane rating of a fuel can be increased.
Worked Solution & Example Answer:State two ways, other than the addition of lead compounds, that the octane rating of a fuel can be increased. - Leaving Cert Chemistry - Question 1(j) - 2003
Step 1
Oxygenates (e.g., MTBE, methanol, ethanol)
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Answer
Adding oxygenates such as MTBE (Methyl Tertiary-Butyl Ether), methanol, or ethanol can enhance the octane rating of fuels. Oxygenates help in improving combustion efficiency and reduce engine knocking.
Step 2
Use of Branches or Short Chains
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Answer
Incorporating branched or short-chain hydrocarbons in the fuel can significantly elevate its octane rating. These molecules tend to burn more smoothly and are less prone to knocking.
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