In the past, and as a consequence of the concerns generated by the atmospheric pollution in cities, the better combustion of gasoline through the incorporation of oxygen into its composition has been pursued. Again, the United States boosted the development of new additives for the world automobile industry. In this sense, the signing of the Clean Air Act in 1970 and the Clean Air Amendments in 1990 introduced reformulated gasoline as an answer to the need for diminishing the
air pollution levels in the biggest cities of the United States. This type of gasoline should have a minimum 2% (by weight) oxygenate and benzene levels less than 1% (by volume; Nadim et al., 2001). The employing of oxygenates is aimed at reducing the atmospheric contamination (smog during summer, CO in winter, and toxic emissions throughout the year) because of the better combustion toward CO2 due to the involvement of one atom of oxygen in their molecules. In addi­tion, these additives present significant antiknocking properties. In this way, the oxygenates play two important roles for elevating the gasoline quality. Precisely, the most employed oxygenates as antiknocking additive in gasoline and has a branched carbon chain like TEL (see Figure 1.2) that suggests the increase of the octane number in its fuel blends. In this way, the oxygenates have allowed the replacement of lead in the gasoline.