This is all about speeding up the reaction H2O + CO2 <=> H2CO3. The
effect of this in open ocean would be in increase ocean acidity, and to
reduce saturation of CaCO3. So although it would accelerate CO2 drawdown
to ocean, it would be at the cost of raising acidity, and making life
harder for calcium carbonate shell formers. It may be fine in an
engineered / lab context, but tipping Ni nanoparticles into ocean would
be pretty daft, not to mention very expensive as I'm sure these
particles are expensive to make! Oliver.
On 07/02/2013 00:24, Ken Caldeira wrote:
Where does the Ca2+ or Mg2+ (or other cations) come from that you
would need to make the carbonate minerals.
The challenge is to find bases that can be extracted without causing
substantial environmental damage.
Usually things that sound too good to be true are too good to be true.
Ken Caldeira
[email protected] <mailto:[email protected]>
+1 650 704 7212
http://dge.stanford.edu/labs/caldeiralab
Typed on an all-thumbs keyboard
On Feb 7, 2013, at 8:17, David Lewis <[email protected]
<mailto:[email protected]>> wrote:
BBC News quotes
<http://www.bbc.co.uk/news/science-environment-21320666> co-author
Lidija Siller: "You bubble CO2 through the water in which you have
nickel nanoparticles and you are trapping much more carbon than you
would normally - and then you can easily turn it into calcium
carbonate. It seems too good to be true, but it works,"
The Newcastle University press release
<http://www.ncl.ac.uk/press.office/press.release/item/could-the-humble-sea-urchin-hold-the-key-to-carbon-capture#.URLBKB3CZ8E> quotes
Siller "the result was the complete removal of CO2". NU PR states
the group has patented the process and are looking for investors.
PhD student lead author Gaurav Bhaduri is quoted: "[the nickel
catalyst] is very cheap, a thousand times cheaper than carbon anhydrase"
Chemistry World, i.e.: "Sea urchin inspires carbon capture catalyst
<http://www.rsc.org/chemistryworld/2013/02/sea-urchin-exoskeleton-nickel-carbon-capture>"
quotes Siller: "'The current challenge that we are addressing is to
quantify the process. We would like to determine the reaction
kinetics and exact yields. Once we have this information we plan to
do a small continuous process in a lab-scale pilot plant". And
they've dug up a skeptic: 'This work represents an incremental
addition to CO_2 capture where the catalytic dimension is relevant,'
comments Mark Keane <http://www.cre.hw.ac.uk/Mark%20A%20Keane.html>,
who investigates catalysis engineering at Heriot-Watt University in
Edinburgh, UK. 'True innovation, however, should harness catalytic
action in the conversion of CO_2 to high value products, such as
carbamates".
On Tuesday, February 5, 2013 11:03:52 AM UTC-8, andrewjlockley wrote:
http://pubs.rsc.org/en/content/articlelanding/2013/cy/c3cy20791a
<http://pubs.rsc.org/en/content/articlelanding/2013/cy/c3cy20791a>
Nickel nanoparticles catalyse reversible hydration of carbon
dioxide for mineralization carbon capture and storage
Gaurav A. Bhaduri and Lidija ŠillerCatal. Sci. Technol., 2013,
Advance Article DOI: 10.1039/C3CY20791A
Abstract
The separation and storage of CO2 in geological form as mineral
carbonates has been seen as a viable method to reduce the
concentration of CO2 from the atmosphere. Mineralization of
CO2 to mineral salts like calcium carbonate provides a stable
storage of CO2. Reversible hydration of CO2 to carbonic acid is
the rate limiting step in the mineralization process. We report
catalysis of the reversible hydration of CO2 using nickel
nanoparticles (NiNPs) at room temperature and atmospheric
pressure. The catalytic activity of the NiNPs is pH independent
and as they are water insoluble and magnetic they can be
magnetically separated for reuse. The reaction steps were
characterized using X-ray photoemission spectroscopy and a
possible reaction mechanism is described.
--
You received this message because you are subscribed to the Google
Groups "geoengineering" group.
To unsubscribe from this group and stop receiving emails from it,
send an email to [email protected]
<mailto:[email protected]>.
To post to this group, send email to [email protected]
<mailto:[email protected]>.
Visit this group at http://groups.google.com/group/geoengineering?hl=en.
For more options, visit https://groups.google.com/groups/opt_out.
--
You received this message because you are subscribed to the Google
Groups "geoengineering" group.
To unsubscribe from this group and stop receiving emails from it, send
an email to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/geoengineering?hl=en.
For more options, visit https://groups.google.com/groups/opt_out.
--
You received this message because you are subscribed to the Google Groups
"geoengineering" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/geoengineering?hl=en.
For more options, visit https://groups.google.com/groups/opt_out.
