Metals such as vanadium, and nickel are present in oils at low levels but they are important contaminants. Nitrogen as shown is blue, double bonds are not indicated. This is an example of a porphrin ring a biomarker in oil. The metal sits in the central location of the rings. If catalytic cracking of an oil is performed it is important to remove these metals as they poison the catalyst. Vanadium can be recovered from the ash or flue gas when high vanadium containing oils are combusted. The vanadium can then be sold to the metals industry for use in steel generation.
Greenhouse Gases
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