老司机直播

We can use climate-warming carbon dioxide for good, 老司机直播 researchers say

Photo of Phil De Luna
鈥淲e鈥檙e taking inspiration from nature and doing it faster and more efficiently,鈥 says Phil De Luna, a 老司机直播 PhD candidate (photo by Tyler Irving)

The thousands of tonnes of carbon dioxide (CO2) emitted from power plants each year doesn鈥檛 have to go into the atmosphere. 

Researchers are increasingly optimistic that, within the next decade, we will be able to affordably capture CO2 waste and convert it into useful molecules for feedstock, biofuels, pharmaceuticals, or renewable fuels. 

In an opinion piece , a team from the University of Toronto鈥檚 Faculty of Applied Science & Engineering and their U.S. collaborators lay out their vision for what we should make with CO2  鈥 and how we can make it.

鈥淪imilar to how a plant takes carbon dioxide, sunlight, and water to make sugars for itself, we are interested in using technology to take energy from the sun or other renewable sources to convert CO2 into small building block molecules which can then be upgraded using traditional means of chemistry for commercial use,鈥 says Phil De Luna, a PhD candidate in the department of materials science and engineering. 鈥淲e鈥檙e taking inspiration from nature and doing it faster and more efficiently.鈥

De Luna is first author on the paper along with postdoctoral fellow Oleksandr Bushuyev, both of whom are members of  Ted Sargent's group.  

Their analysis identified a series of possible small molecules that could be made economically by converting captured CO2. For energy storage needs, hydrogen, methane, and ethane could be used in biofuels. Additionally, ethylene and ethanol could serve as the building blocks for a range of consumer goods, and CO2-derived formic acid could be used by the pharmaceutical industry or as a fuel in fuel cells.

While technologies that can capture CO2 waste are still in their infancy, with new startups currently developing strategies for commercial use, the researchers envision major improvements in the coming decades to make CO2 capture and conversion a reality. Within five to 10 years, electrocatalysis 鈥 鈥渨hich stimulates chemical reactions through electricity鈥 鈥 could be a way into this process. And 50 years or more down the line, molecular machines or nanotechnology could drive conversion.

鈥淭his is still technology for the future,鈥 says Bushuyev, 鈥渂ut it鈥檚 theoretically possible and feasible, and we鈥檙e excited about its scale up and implementation. If we continue to work at this, it鈥檚 a matter of time before we have power plants where CO2 is emitted, captured, and converted.鈥

The authors are aware of the limitations of carbon capture and conversion. First, it has been criticized for not being economically feasible, particularly because of the high cost of electricity to make these chemical reactions take place. But this will likely go down as renewable energy becomes more widespread. Second, there are few factories with a high carbon footprint that emit pure CO2, which is necessary for conversion, but technology that could help with this issue is in development.

鈥淭he motivation to write this piece is that we wanted clear insight into whether this could be economically viable, and whether it鈥檚 worth the time to invest in it,鈥 De Luna says, adding the paper imagines a pathway "for what we can do with carbon dioxide conversion in the coming decades.鈥

Insights for the analysis were developed in collaboration with Ling Tao, Genevieve Saur, and Jao van de Lagemaat at the U.S. National Renewable Energy Laboratory.

With files from Joseph Caputo, Cell Press

 

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