Gasoline hydrogenation
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The color of catalyzed gasoline changes significantly before and after hydrogenation; which components change as a result of this color change?
Gasoline is composed of mixed hydrocarbons, as well as some derivatives of hydrocarbons that contain heteroatoms. In hydrocarbons, unsaturated hydrocarbons exhibit a darker color as the degree of unsaturation increases. Some hydrocarbon derivatives containing heteroatoms also exhibit a darker color due to the effect of these heteroatoms. Other unsaturated hydrocarbons, when exposed to light, oxygen, and heat, undergo polymerization to form substances with darker colors. By hydrogenation, hydrocarbons are fully saturated and heteroatoms are removed, causing the color of the oil to lighten or even become colorless.