Diesel, made simply from coffee grounds (ah, the exhaust aroma)

By Henry Fountain
Published: December 16, 2008

In research that touches on two of Americans' great obsessions — coffee and cars — scientists at the University of Nevada, Reno, have made diesel fuel from used coffee grounds.

The technique is not difficult, they report in The Journal of Agricultural and Food Chemistry, and there is so much coffee around that several hundred million gallons of biodiesel could potentially be made annually.

Dr. Mano Misra, a professor of engineering who conducted the research with Narasimharao Kondamudi and Susanta K. Mohapatra, said it was by accident that he realized coffee beans contained a significant amount of oil. "I made a coffee one night but forgot to drink it," he said. "The next morning I saw a layer of oil floating on it." He and his team thought there might be a useful amount of oil in used grounds, so they went to several Starbucks stores and picked up about 50 pounds of them.

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