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Scientists Break Ground With New Green Diesel

MADISON, Wis. -- Researchers at the University of Wisconsin-Madison College of Engineering have discovered a new way to make a diesel-like liquid fuel from carbohydrates commonly found in plants, according to

In the June 3 issue of Science journal, graduate students George Huber, Juben Chheda and Chris Barrett, along with Professor James Dumesic detailed a four-phase catalytic reactor in which corn and other biomass-derived carbohydrates can be converted to sulphur-free liquid alkanes resulting in an ideal additive for diesel transportation.

“It's a very efficient process,” Huber, one of the three chemical and biological engineering grad students, said. “The fuel produced contains 90 percent of the energy found in the carbohydrate and hydrogen feed. If you look at the carbohydrate source such as corn, our new process has the potential to create twice the energy as is created in using corn to make ethanol.”

About 67 percent of the energy required to make ethanol is consumed in fermenting and distilling corn, the report concluded. As a result, ethanol production creates 1.1 units of energy for every unit of energy consumed. In the UW-Madison process, the desired alkanes spontaneously separate from water with no additional heating or distillation required. The result is the creation of 2.2 units of energy for every unit of energy consumed in energy production.

“The fuel we're making stores a considerable amount of hydrogen,” said Dumesic. “Each molecule of hydrogen is used to convert each carbon atom in the carbohydrate reactant to an alkane. It's a very high yield. We don't lose a lot of carbon. The carbon acts as an effective energy carrier for transportation vehicles. It's not unlike the way our own bodies use carbohydrates to store energy.”

Because the UW-Madison process works with a range of carbohydrates, a wide range of plants, and more parts of the plant, can be consumed to make fuel.

“The current delivered cost of biomass is comparable or even cheaper than petroleum-based feedstock on an energy basis,” Huber says. “This is one step in figuring out how to efficiently use our biomass resources.”
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