Dear David,
I don't know the details of the technique, it is nice to see all the
research done on this.
$1000 per ton C would correspond to $270 per ton CO2 extracted, in line
with what other claims for direct capture, but these numbers should be
taken with a pinch of salt. The fact that C nanofibers sell a high price
is certainly interesting, but I guess the market is small. Do we really
need 500 Gt of C nanofibers? I would think the only mass market for C
captured from the air is fuel.
Regards,
Olivier
Stuart Licht at George Washington University apparently spoke at the
American Chemical Society meeting today on a technique for extracting
CO2 from the air and converting it into carbon nanofibers. Some
highlights from the AAAS press release (linked below):
* Licht says, "We calculate that with a physical area less than 10
percent the size of the Sahara Desert, our process could remove enough
CO2 to decrease atmospheric levels to those of the pre-industrial
revolution within 10 years."
* Energy costs are estimated to be about $1,000 per ton of carbon
nanofibers. Carbon nanofibers currently sell for much more than that.
* "Because of its efficiency, this low-energy process can be run using
only a few volts of electricity, sunlight and a whole lot of carbon
dioxide. At its root, the system uses electrolytic syntheses to make
the nanofibers. CO2 is broken down in a high-temperature electrolytic
bath of molten carbonates at 1,380 degrees F (750 degrees C)....To
power the syntheses, heat and electricity are produced through a
hybrid and extremely efficient concentrating solar-energy system. The
system focuses the sun's rays on a photovoltaic solar cell to generate
electricity and on a second system to generate heat and thermal
energy, which raises the temperature of the electrolytic cell."
http://www.eurekalert.org/pub_releases/2015-08/acs-ft071615.php
Does anyone know more about this? It certainly sounds too good to be true.
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