The best cetane improver is a chemical that has the effect of increasing diesel fuel's Cetane number. A few examples are nitrates, nitroalkanes, nitro carbonates and peroxides. One of the main Cetane Improver additives manufactured today is 2-Ethylhexyl nitrate which starts to decompose at 130 °C. 2-Ethylhexyl nitrate is the consequence of the response of 2-ethyl hexanol and nitric acid.