May 09, 2019

Plant-Based Jet Fuels

2 minutes

The global aviation industry uses a whole lot of fuel: more than 5 million barrels a day. It is an incredibly energy-intensive industry and almost all of its energy comes from petroleum-based fuels.

While other large energy sectors such as electric power, ground

transportation and commercial buildings have well-defined pathways to adopting renewable

energy sources, the aviation industry does not have such a straightforward way

to make a transition to sustainability.

Electrifying planes using batteries or fuel cells is very challenging

for a number of reasons, notably the weight restrictions on aircraft. So liquid biofuels as replacements for

petroleum-based fuels remain the most promising approach.

A new study at the Lawrence Berkeley National Laboratory concludes

that sustainable plant-based biofuels could provide a competitive alternative

to conventional petroleum fuels if current development and scale-up initiatives

are successful.

Multidisciplinary teams based at the Department of Energy’s Joint

BioEnergy Institute are focused on optimizing each stage of the bio-jet fuel

production process. This includes bioengineering

ideal source plants and developing methods for efficiently isolating the

carbohydrates in non-food biomass that bacteria can digest and bioconvert into

fuel molecules.

The critical issue is cost. The

theoretical cost of bio-jet fuel has come down dramatically in recent years but

is still around $16 a gallon. The cost

of standard jet fuel is about $2.50 a gallon.

So, the real challenge is bridging that gap.

Reducing the cost of the fuel could come both from the material and process improvements that are underway as well as by finding ways to turn the leftover lignin residuals from the bioconversion process into valuable chemicals.

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Web Links

Bright Skies for Plant-Based Jet Fuels

Photo, posted March 28, 2009, courtesy of Yasuhiro Chatani via Flickr.

Earth Wise is a production of WAMC Northeast Public Radio.

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By Randy Simon

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