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Biofuel Could Lighten Jet Fuel's Carbon Footprint Over 80 Percent

The seeds of a lowly weed could cut jet fuel's cradle-to-grave carbon emissions by 84 percent. David Shonnard, Robbins Chair Professor of Chemical Engineering, analyzed the carbon dioxide emissions of jet fuel made from camelina oil over the course of its life cycle, from planting to tailpipe.

"Camelina jet fuel exhibits one of the largest greenhouse gas emission reductions of any agricultural feedstock-derived biofuel I've ever seen," he said. "This is the result of the unique attributes of the crop — its low fertilizer requirements, high oil yield and the availability of its coproducts, such as meal and biomass, for other uses."

Camelina sativa originated in Europe and is a member of the mustard family, along with broccoli, cabbage and canola. Sometimes called false flax or gold-of-pleasure, it thrives in the semi-arid conditions of the Northern Plains; the camelina used in the study was grown in Montana.

Oil from camelina can be converted to a hydrocarbon green jet fuel that meets or exceeds all petroleum jet fuel specifications. The fuel is a "drop-in" replacement that is compatible with the existing fuel infrastructure, from storage and transportation to aircraft fleet technology. "It is almost an exact replacement for fossil fuel," Shonnard explained. "Jets can't use oxygenated fuels like ethanol; they have to use hydrocarbon replacements."

Shonnard conducted the lifecycle analysis for UOP LLC, of Des Plaines, Ill., a subsidiary of Honeywell and a provider of oil refining technology. In an April 28 release, it cited Boeing executive Billy Glover, managing director of environmental strategy, who called camelina "one of the most promising sources for renewable fuels that we've seen."

"It performed as well if not better than traditional jet fuel during our test flight with Japan Airlines earlier this year and supports our goal of accelerating the market availability of sustainable, renewable fuel sources that can help aviation reduce emissions," Glover said. "It's clear from the life cycle analysis that camelina is one of the leading near-term options and, even better, it's available today."

Because camelina needs little water or nitrogen to flourish, it can be grown on marginal agricultural lands. "Unlike ethanol made from corn or biodiesel made from soy, it won't compete with food crops," said Shonnard. "And it may be used as a rotation crop for wheat, to increase the health of the soil."

Tom Kalnes is a senior development associate for UOP in its renewable energy and chemicals research group. His team used hydroprocessing, a technology commonly used in the refining of petroleum, to develop a flexible process that converts camelina oil and other biological feedstocks into green jet fuel and renewable diesel fuel.

As to whether we will all be flying in plant-powered aircraft, his answer is, "It depends."

"There are a few critical issues," Kalnes said. "The most critical is the price and availability of commercial-scale quantities of second generation feedstocks." Additionally, more farmers need to be convinced to grow a new crop, and refiners must want to process it.

"But if it can create jobs and income opportunities in rural areas, that would be wonderful," he said.

Marcia Goodrich is a senior writer within the university marketing and communications office at Michigan Technological University.

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