Nonrenewable fossil fuels give liquid fuels a bad name.<\/p>\n
But not all liquid fuels are fossil fuels, and fuels don\u2019t have to be dirty.<\/p>\n
Fuels are considered dirty when they put new carbon dioxide into the atmosphere, which causes pollution and the buildup of environmentally detrimental greenhouse gases. But what if rather than using fuels that add carbon dioxide, we could create fuels that recycle carbon dioxide from the atmosphere?<\/p>\n
Researchers at Arizona State University are exploring the idea of creating fuels that do just that: carbon-neutral liquid fuels. Think of them as fuels created out of thin air.<\/p>\n
The endeavor builds on the advances being made at ASU\u2019s Center for Negative Carbon Emissions, which is developing a technology that collects carbon dioxide from the atmosphere using an air-capture technique that literally scrubs it from the air and then captures it so it can be reused at an affordable cost \u2014 a carbon dioxide recycling program.<\/p>\n
This effort moves toward closing the carbon cycle, which means making sure no new carbon dioxide ends up in the atmosphere \u2014 essential for ensuring that concentrations don\u2019t surpass unsafe limits for life on Earth.<\/p>\n
In addition to the environmental benefits of removing carbon dioxide, excessive amounts of it can be turned into carbon-neutral liquid fuels, making it a renewable energy source.<\/p>\n
How exactly can fuel be pulled from thin air? Like any magic act, it is surprisingly simple.<\/p>\n
First, the center’s researchers generate hydrogen by using a renewable, carbon-free electricity source (such as wind energy or solar power) to split water through a process called electrolysis.<\/p>\n
Second, this gaseous hydrogen is combined with the carbon dioxide captured from air.<\/p>\n
What does this mixture produce? Methanol, an alcohol fuel similar to ethanol. Voila! Fuel from air.<\/p>\n
Like ethanol, methanol can be blended with gasoline or further processed into gasoline.<\/p>\n
\u201cWhen this methanol or synthetic gasoline is burned, it releases carbon dioxide and water back into the atmosphere where it can then be recaptured and reused to make more fuel,\u201d said Steve Atkins, a Center for Negative Carbon Emissions senior engineer who specializes in this technology.<\/p>\n
Methanol can also be converted into plastics that would be carbon negative, or into other fuels such as diesel and jet fuel.<\/p>\n
\u201cIf we can make air-capture affordable then we have a carbon-neutral feedstock to make liquid fuels and take advantage of abundant renewable energy,\u201d said Christophe Jospe, who was CNCE\u2019s chief strategist from September 2014 until June of this year and is now founding The Carbon A List to highlight the most promising approaches to capturing and recycling carbon dioxide.<\/p>\n
The big impacts of this technology are threefold.<\/p>\n
First, it can help society to go carbon neutral. Unlike fossil fuels, carbon-neutral liquid fuels do not add greenhouse gases or generate a net carbon footprint. Limiting, and preferably reducing, our carbon footprint is essential for sustaining life.<\/p>\n
Second, this technology is attractive because carbon-neutral liquid fuels can be used within our current industrial infrastructure.<\/p>\n
\u201cIf we can\u2019t use the internal combustion engines in our cars, then we have wasted assets,\u201d Jospe said. This renewable alternative can work within society\u2019s current infrastructure and energy system and be more sustainable.
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Third, it addresses some of the limitations of other renewable energy methods. Solar and wind power experience intermittent drops in energy production. Much like traditional liquid fuels, carbon-neutral liquid fuels can be stored long-term and used in accordance with demand.<\/p>\n
\u201cDuring periods of intermittency in renewable energy, you could utilize liquid, carbon-neutral synthetic fuels to provide electrical power,\u201d said Atkins \u2014 though he acknowledges the round-trip efficiency (electricity to fuels and back to electricity) would be low.<\/p>\n
Related to our transportation fleet, Jospe said, \u201cWe don\u2019t need to move toward a totally electrified transportation fleet. We can use fuels, but the fuels need to become carbon neutral.\u201d<\/p>\n
Flying an airplane with an electric battery may not be a realistic option due to the reality of energy density (how much energy is contained within a unit).<\/p>\n
\u201cBatteries can\u2019t pack as much electrons into the same amount of space,\u201d Jospe said.<\/p>\n
That means options like jet fuel are beneficial because they are lighter weight, and can power travel across further distances. Maybe it\u2019s easiest to say that they offer users more bang for their buck.<\/p>\n
But nonrenewable fuels, like jet fuel, also come with nasty consequences for the environment.<\/p>\n
Promisingly, the energy density of carbon-neutral liquid fuels can be more advantageous than current batteries. They are also better than fossil fuels because they avoid adding new carbon to the atmosphere.<\/p>\n
Arvind Ramachandran, a first-year environmental engineering doctoral student, is advancing research in converting captured carbon dioxide into fuels and chemicals under the supervision of Klaus Lackner, the director of CNCE and a professor in ASU\u2019s Ira A. Fulton Schools of Engineering.<\/p>\n
\u201cI think it is very clear that we have to figure out a way to become carbon negative or at least carbon neutral,\u201d said Ramachandran, who earned his master\u2019s degree in chemical engineering from Columbia University.<\/p>\n
\u201cMaking sure that our mobile sources of carbon dioxide emissions, such as cars and airplanes, are running on carbon-neutral fuels represents a powerful way of achieving carbon neutrality,\u201d he said.<\/p>\n
The U.S. Department of Energy\u2019s ARPA-E REFUEL program (short for Advanced Research Projects Agency-Energy\u2019s Renewable Energy to Fuels through Utilization of Energy-dense Liquids) is currently offering funding opportunities to encourage innovations in liquid fuel technology that promise significant impacts.<\/p>\n
Jospe thinks the air-capture technique fits the need by supporting the synthesis of fuels made from the air. CNCE is currently applying for ARPA-E funding to advance this effort.<\/p>\n
Getting fuels from air is not the only option researchers at ASU are exploring. Others are advancing the production of biofuels from algae as part of a multi-university project supported by a recently awarded $2 million grant from the Bioenergy Technologies Office in the U.S. Department of Energy.<\/p>\n
Additional niche applications of the air-capture technology would make it possible to use it to carbonate beverages, create high-value chemicals and sequester carbon in products such as graphene, plastics and carbon fiber.<\/p>\n
These and many other products and systems require the use of carbon dioxide.<\/p>\n
\u201cLet\u2019s get that carbon from air so we know it\u2019s carbon neutral, rather than a source that doesn\u2019t help us close the carbon cycle,\u201d Jospe said.<\/p>\n
CNCE researchers will promote and build on these ideas further when ASU hosts the Fuels From Air Conference on Sept. 28-30. The conference will bring researchers from around the world to discuss closing the carbon cycle, techniques in taking fuels from air and different ways to turn carbon dioxide into fuels.<\/p>\n
Ramachandran, a budding specialist in this new and exciting field, said it best: \u201cThe answer to our search for a sustainable future is likely to involve a combination of technologies \u2014 and fuels from air will play an important role.\u201d<\/p>\n
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