1159779
Ano: 2019
Disciplina: Inglês (Língua Inglesa)
Banca: CONTEMAX
Orgão: Pref. Lucena-PB
Disciplina: Inglês (Língua Inglesa)
Banca: CONTEMAX
Orgão: Pref. Lucena-PB
Provas:
TEXT II
Researchers have used liquid metals to turn carbon
dioxide back into solid coal, in a world-first
breakthrough that could transform our approach to
carbon capture and storage. The research team led
by RMIT University in Melbourne, Australia, have
developed a new technique that can efficiently
convert CO2 from a gas into solid particles of carbon.
Published in the journal Nature Communications, the
research offers an alternative pathway for safely and
permanently removing the greenhouse gas from our
atmosphere. Current technologies for carbon capture
and storage focus on compressing CO2 into a liquid
form, transporting it to a suitable site and injecting it
underground. But implementation has been
hampered by engineering challenges, issues around
economic viability and environmental concerns about
possible leaks from the storage sites. RMIT
researcher Dr Torben Daeneke said converting
CO2 into a solid could be a more sustainable
approach.
"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,"
Daeneke, an Australian Research, said.
"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."
How the carbon conversion works
Lead author, Dr Dorna Esrafilzadeh, a Vice-
Chancellor's Research Fellow in RMIT's School of
Engineering, developed the electrochemical technique to capture and convert atmospheric CO2 to
storable solid carbon. To convert CO2, the
researchers designed a liquid metal catalyst with
specific surface properties that made it extremely
efficient at conducting electricity while chemically
activating the surface. The carbon dioxide is
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. Esrafilzadeh said the carbon produced could
also be used as an electrode.
"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 byproduct,
which could also have industrial
applications."
The research was conducted at RMIT's MicroNano
Research Facility and the RMIT Microscopy and
Microanalysis Facility, with lead investigator,
Honorary RMIT and ARC Laureate Fellow, Professor
Kourosh Kalantar-Zadeh (now UNSW). The research
is supported by the Australian Research Council
Centre for Future Low-Energy Electronics
Technologies (FLEET) and the ARC Centre of
Excellence for Electromaterials Science (ACES). The
collaboration involved researchers from Germany
(University of Munster), China (Nanjing University of
Aeronautics and Astronautics), the US (North
Carolina State University) and Australia (UNSW,
University of Wollongong, Monash University, QUT).
Adaptado de:
https://www.sciencedaily.com/releases/2019/02/1902
26112429.htm acesso em 03/03/2019
Based on the text, answer the questions 31 to 34.
About how the carbon conversion works, choose the best option:
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