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CARBON WORLDS
Capturing CO2 from trucks and reducing their emissions by 90 percent
by Staff Writers
Lausanne, Switzerland (SPX) Dec 30, 2019

Researchers at EPFL have patented a new concept that could cut trucks' CO2 emissions by almost 90%. It involves capturing CO2 within the exhaust system, converting it into a liquid and storing it on the vehicle. The liquid CO2 would then be delivered to a service station and where it will be turned back into fuel using renewable energy.

In Europe, transport is responsible for nearly 30% of the total CO2 emissions, of which 72% comes from road transportation*. While the use of electric vehicles for personal transportation could help lower that number, reducing emissions from commercial transport - such as trucks or buses - is a much greater challenge.

Researchers at EPFL have now come up with a novel solution: capturing CO2 directly in the trucks' exhaust system and liquefying it in a box on the vehicle's roof. The liquid CO2 is then delivered to a service station, where it is turned into conventional fuel using renewable energy.

The project is being coordinated by the Industrial Process and Energy Systems Engineering group, led by Francois Marechal, at EPFL's School of Engineering. The patented concept is the subject of a paper published in Frontiers in Energy Research.

A complex process onboard the vehicle
Scientists propose to combine several technologies developed at EPFL to capture CO2 and convert it from a gas to a liquid in a process that recovers most of energy available onboard, such as heat from the engine. In their study, the scientists used the example of a delivery truck.

First, the vehicle's flue gases in the exhaust pipe are cooled down and the water is separated from the gases. CO2 is isolated from the other gases (nitrogen and oxygen) with a temperature swing adsorption system, using metal-organic frameworks (MOFs) adsorbent, which are specially designed to absorb CO2. Those materials are being developed by the Energypolis team at EPFL Valais Wallis, led by Wendy Queen.

Once the material is saturated with CO2, it is heated so that pure CO2 can be extracted from it. High speed turbocompressors developed by Jurg Schiffmann's laboratory at EPFL's Neuchatel campus use heat from the vehicle's engine to compress the extracted CO2 and turn it into a liquid.

That liquid is stored in a tank and can then be converted back into conventional fuel at the service stations using renewable electricity. "The truck simply deposits the liquid when filling up with fuel," says Marechal.

The whole process takes place within a capsule measuring 2 m x 0.9 m x 1.2 m, placed above the driver's cabin. "The weight of the capsule and the tank is only 7% of the vehicle's payload," adds Marechal. "The process itself uses little energy, because all of its stages have been optimized."

The researchers' calculations show that a truck using 1 kg of conventional fuel could produce 3kg of liquid CO2, and that the conversion does not involve any energy penalty.

Only 10% of the CO2 emissions cannot be recycled, and the researchers propose to offset that using biomass.

The system could theoretically work with all trucks, buses and even boats, and with any type of fuel. The advantage of this system is that, unlike electric or hydrogen-based ones, it can be retrofitted to existing trucks in order to neutralize their impact in terms of carbon emissions.

Research Report: "Carbon Dioxide Capture From Internal Combustion Engine Exhaust Using Temperature Swing Adsorption"


Related Links
Ecole Polytechnique Federale de Lausanne
Carbon Worlds - where graphite, diamond, amorphous, fullerenes meet


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CARBON WORLDS
Growing carbon nanotubes with the right twist
Seoul, South Korea (SPX) Dec 16, 2019
In a recently published paper in Science Advances, Feng Ding of the Center for Multidimensional Carbon Materials, within the Institute of Basic Science (IBS, South Korea) and colleagues, have achieved the creation of a specific type of carbon nanotubes (CNTs) with a selectivity of 90%, and expanded the current theory that explains the synthesis of these promising nano-cylinders. CNTs are incredibly strong and light nanomaterials made of carbon with superior current carrying capacity and very high ... read more

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