U of MN Researchers Turn Soy Oil, Glucose into Hydrogen

A University of Minnesota team has invented a “reactive flash volatilization process” that heats oil and sugar and produces hydrogen and carbon monoxide, a mixture called synthesis gas, or syngas, because it is used to make chemicals and fuels, including gasoline. The new process works 10 to 100 times faster than current technology, and could significantly improve the efficiency of fuel production from renewable energy sources.

“It’s a way to take cheap, worthless biomass and turn it into useful fuels and chemicals,” said team leader Lanny Schmidt, a Regents Professor of chemical engineering and materials science at the U of MN. “Potentially, the biomass could be used cooking oil or even products from cow manure, yard clippings, cornstalks or trees.” One up-and-coming fuel is biodiesel, which is produced from soy oil. Currently, the key step in conversion of the oil to biodiesel requires the addition of methanol, a fossil fuel. The new process skips the biodiesel step and turns oil straight into hydrogen and carbon monoxide gases by heating it to about 1,000 degrees C. About 70 percent of the hydrogen in the oil is converted to hydrogen gas. Similarly, using a nearly saturated solution of glucose in water, the process heats the sugar so fast that it, too, breaks up into syngas instead of its usual products: carbon and water. A difficulty in turning plant material into usable fuels has been breaking down the chemical bonds in cellulose — he material that gives plant cell walls their stiffness — to liberate simple sugars that can be fermented into ethanol or turned into other fuels. That requires special enzymes and lots of time. But the high heat of the new process breaks those bonds with ease, meaning cellulose and similar plant materials can possibly be used as feedstocks. Schmidt and his university colleagues — graduate students James Salge, Brady Dreyer and Paul Dauenhauer — have produced a pound of synthesis gas in a day using their small-scale reactor. The work, which was just was published in Science, was supported by the Department of Energy and the University of Minnesota Initiative for Renewable Energy and the Environment.

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