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New process derives 'green gasoline' from plant sugars
Date:9/19/2008

MADISON Alternative energy doesn't always mean solar or wind power. In fact, the alternative fuels developed by University of Wisconsin-Madison chemical and biological engineering professor James Dumesic look a lot like the gasoline and diesel fuel used in vehicles today.

That's because the new fuels are identical at the molecular level to their petroleum-based counterparts. The only difference is where they come from.

Funded by the National Science Foundation and the U.S. Department of Energy, Dumesic and his team have developed a process that creates transportation fuels from plant material. The paper, published in the Sept. 18 online version of the journal Science, explains how they convert sugar into molecules that can be efficiently "upgraded" into gasoline, diesel and jet fuel.

"Domestically, there are large amounts of lignocellulose available that are not being used effectively for energy," says Dumesic. "This work is a step along the way to making it practical to use biomass as fuel."

Lignocellulose refers to nonedible sources of biomass, which is biological material that can be converted into fuel. Instead of relying on corn as a source of energy, Dumesic notes that the goal of researchers in the field of "cellulosic ethanol" is to turn the carbohydrates, or sugars, from agricultural waste, corn stovers (leaves and stalks), switchgrass and forest residue into ethanol. Dumesic now suggests that instead of converting the water-soluble sugars derived from cellulose to ethanol, it may be better to convert these sugars to gasoline, diesel and jet fuels via this process.

Sugars are an attractive basis for fuel because they are abundant. Sugars comprise the largest portion of biomass, and the oil layer created by Dumesic retains 90 percent of the energy content in the original sugars.

The process of converting sugar into fuel begins by adding a solid catalyst to an aqueous solution, leading to
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Contact: James Dumesic
dumesic@engr.wisc.edu
608-263-0288
University of Wisconsin-Madison
Source:Eurekalert

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