MAR 09, 2019 7:16 PM PST

The controversy of turning carbon dioxide back into coal

New research from RMIT University in Melbourne, Australia and published in the journal Nature Communications has turned an interesting idea into reality: turning carbon dioxide back into solid coal. Now the question is, is this process economically, environmentally, and ethically viable?

The researchers were led by Dr. Dorna Esrafilzadeh, a Vice-Chancellor's Research Fellow in RMIT's School of Engineering. Dr. Torben Daeneke, an Australian Research Council DECRA Fellow, was one of Esrafilzadeh’s collaborators.

Daeneke commented, "While we can't literally turn back time, turning carbon dioxide back into coal and burying it back in the ground is a bit like rewinding the emissions clock. To date, CO2 has only been converted into a solid at extremely high temperatures, making it industrially unviable. By using liquid metals as a catalyst, we've shown it's possible to turn the gas back into carbon at room temperature, in a process that's efficient and scalable. While more research needs to be done, it's a crucial first step to delivering solid storage of carbon."

The technique developed by the team utilizes liquid metals to convert carbon dioxide into solid coal. Previous methods of carbon capture have traditionally converted carbon dioxide into liquid forms, which are then disposed of underground. Such disposal has caused concern in the scientific field for the potential consequences that leaking storage sites could cause. This new strategy could eliminate that worry.

The process that the researchers designed makes use of a liquid metal catalyst that has particular surface properties that made it exceptionally efficient at conducting electricity while chemically activating the surface. Science Daily explains the process: “carbon dioxide is first dissolved in a beaker filled with an electrolyte liquid and a small amount of the liquid metal, which is then charged with an electrical current. The CO2 slowly converts into solid flakes of carbon, which are naturally detached from the liquid metal surface, allowing the continuous production of carbonaceous solid.”

Should we turn carbon dioxide back into coal? Photo: Pixabay

The production of this solid has potential not only to permanently remove greenhouse gases from our atmosphere in the form of carbon dioxide, but also to act as an electrode. Esrafilzadeh elaborates, "A side benefit of the process is that the carbon can hold electrical charge, becoming a supercapacitor, so it could potentially be used as a component in future vehicles. The process also produces synthetic fuel as a by-product, which could also have industrial applications."

Sources: Science Daily, Nature Communications

About the Author
  • Kathryn is a curious world-traveller interested in the intersection between nature, culture, history, and people. She has worked for environmental education non-profits and is a Spanish/English interpreter.
You May Also Like
AUG 18, 2020
Health & Medicine
Using Wastewater Surveillance to Track COVID-19 Outbreaks
AUG 18, 2020
Using Wastewater Surveillance to Track COVID-19 Outbreaks
Even as countries are now gradually starting to reopen after lockdown, the COVID-19 pandemic is far from over. Researche ...
AUG 06, 2020
Chemistry & Physics
The fluid dynamics of injection-induced earthquakes
AUG 06, 2020
The fluid dynamics of injection-induced earthquakes
While injection-induced earthquakes have become commonplace in oil fields where wastewater is pumped deep into the Earth ...
AUG 09, 2020
Earth & The Environment
Weaker than ever before: Florida's currents and what it means for us
AUG 09, 2020
Weaker than ever before: Florida's currents and what it means for us
New research published in Nature Communications provides evidence that the currents in the Gulf Stream are slowing down. ...
SEP 08, 2020
Earth & The Environment
Huge international supply chains account for 20% of global emissions
SEP 08, 2020
Huge international supply chains account for 20% of global emissions
This may come as a surprise to exactly no one, but multinational companies are the culprits of the highest levels of car ...
OCT 05, 2020
Earth & The Environment
The rising concern of aerosol particles
OCT 05, 2020
The rising concern of aerosol particles
A study from Colorado State University scientists provides insight into the resiliency of aerosol particles, particles f ...
NOV 18, 2020
Plants & Animals
This Bat Species Uses Masks for Mating
NOV 18, 2020
This Bat Species Uses Masks for Mating
From pandemic precautions to televised talent shows, masks are having a moment. Even this bizarre bat species has a buil ...
Loading Comments...