Effect of Alcohol and Copper Content on the Stability of Automotive Gasoline

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• 作者：Rita C. C. Pereira and Vâ ; nya M. D. Pasa
• 刊名：Energy & Fuels
• 出版年：2005
• 出版时间：March 2005
• 年：2005
• 卷：19
• 期：2
• 页码：426 - 432
• 全文大小：143K
• 年卷期：v.19,no.2(March 2005)
• ISSN：1520-5029

文摘

Gasoline is a volatile liquid that is used in internal combustion engines. It is formed by amixture of paraffins, naphthenes, olefins, and aromatic hydrocarbons (C₄-C₁₂). During storage,the hydrocarbons present in gasoline react with atmospheric oxygen, and with each other,promoting changes in its physical and chemical properties, because of the formation of gums.These materials present macromolecular character and normally cause undesirable effects, suchas deposits in filters and distribution lines. The present work evaluated the formation of gumsin Brazilian gasoline added with different anhydrous ethyl alcohol and copper contents in thefuel. A discussion of the oxidation reaction mechanisms is also presented. The results show thatthe addition of anhydrous ethyl alcohol to gasoline does not contribute to the formation of gumin gasoline. It can be stated that the addition of anhydrous ethyl alcohol to gasoline providesbenefits such as a reduction of gum deposits in an engine per liter of fuel consumed. Now, copperinterferes significantly in the gum content of gasoline, because it is a catalyst of radicalar oxidationreactions and it accelerates peroxidation. Therefore, this metal must be avoided in any metalalloy that comes into contact with gasoline in the feeding system of engines.