A new study published June 25 in Nature Climate Change evaluates the potential for recently described methods that capture carbon dioxide from the atmosphere through an “electrogeochemical” process that also generates hydrogen gas for use as fuel and creates by-products that can help counteract ocean acidification.
First author Greg Rau, a researcher in the Institute of Marine Sciences at UC Santa Cruz and visiting scientist at Lawrence Livermore National Laboratory, said this technology significantly expands the options for negative emissions energy production.
The process uses electricity from a renewable energy source for electrolysis of saline water to generate hydrogen and oxygen, coupled with reactions involving globally abundant minerals to produce a solution that strongly absorbs and retains carbon dioxide from the atmosphere. Rau and other researchers have developed several related methods, all of which involve electrochemistry, saline water, and carbonate or silicate minerals.
“It not only reduces atmospheric carbon dioxide, it also adds alkalinity to the ocean, so it’s a two-pronged benefit,” Rau said. “The process simply converts carbon dioxide into a dissolved mineral bicarbonate, which is already abundant in the ocean and helps counter acidification.”
The negative emissions approach that has received the most attention so far is known as “biomass energy plus carbon capture and storage” (BECCS). This involves growing trees or other bioenergy crops (which absorb carbon dioxide as they grow), burning the biomass as fuel for power plants, capturing the emissions, and burying the concentrated carbon dioxide underground.
“BECCS is expensive and energetically costly. We think this electrochemical process of hydrogen generation provides a more efficient and higher capacity way of generating energy with negative emissions,” Rau said.
He and his coauthors estimated that electrogeochemical methods could, on average, increase energy generation and carbon removal by more than 50 times relative to BECCS, at equivalent or lower cost. He acknowledged that BECCS is farther along in terms of implementation, with some biomass energy plants already in operation. Also, BECCS produces electricity rather than less widely used hydrogen.
“The issues are how to supply enough biomass and the cost and risk associated with putting concentrated carbon dioxide in the ground and hoping it stays there,” Rau said.
The electrogeochemical methods have been demonstrated in the laboratory, but more research is needed to scale them up. The technology would probably be limited to sites on the coast or offshore with access to saltwater, abundant renewable energy, and minerals. Coauthor Heather Willauer at the U.S. Naval Research Laboratory leads the most advanced project of this type, an electrolytic-cation exchange module designed to produce hydrogen and remove carbon dioxide through electrolysis of seawater. Instead of then combining the carbon dioxide and hydrogen to make hydrocarbon fuels (the Navy’s primary interest), the process could be modified to transform and store the carbon dioxide as ocean bicarbonate, thus achieving negative emissions.
“It’s early days in negative emissions technology, and we need to keep an open mind about what options might emerge,” Rau said. “We also need policies that will foster the emergence of these technologies.”
###
The paper: https://www.nature.com/articles/s41558-018-0203-0
Discover more from Watts Up With That?
Subscribe to get the latest posts sent to your email.
good luck
What percentage of scientists say that active removal of carbon dioxide from the atmosphere will stop the climate from changing??
Answer :- ZERO percent!
Active removal of alarmists from academia would be much more sensible……
I see, they are killing two birds with one stone. Wasting incredible amount of energy and depleting the planet of CO2
Yeah, that’s the ticket.
Three birds.. don’t forget the massive amount of money (government) that will be needed to implement.
Who gave them the right to decide for the rest of us what the “right amount” of CO2 is?
Four birds….don’t forget the actual birds that get chopped up.
“We also need policies that will foster the emergence of these technologies”
it says it all. Particularly as there is no mention of the overall energy balance which I suspect will be negative.
‘ a solution that strongly absorbs and retains carbon dioxide from the atmosphere’. It already exists, it’s called chlorophyll.
right. just plant a tree if you want to pull carbon and make oxygen. Its a two pronged solution.
It is an expensive way of fixing carbon dioxide. A comparable process using lots of electricity is aluminium smelting, which produces about 58 Megatons of Al a year. Fiddling with atomic weight ratios says that the same electricity would account for 77 Mtons of carbon a year, turned into bicarbonate. That is less than 1% of current emissions. Of course, hydrogen is a byproduct.
… Of course, hydrogen is a byproduct….
Time and time again humans have been warned that it is not a good idea to push large quantities of a gas into a system when you are not quite sure of what the effect will be. If that system is finely balanced, you may hit a tipping point, and disrupt it quite badly – and if it is a system that humans depend on to live, the results of that disruption could be very grave.
In these circumstances the Precautionary Principle ought to be followed – don’t do anything until you are quite sure that the impact will not be damaging.
Now, luckily, we can be sure that the climate system is quite robust against the impact of CO2, since the proportion has gone up considerably, and we have had no dangerous runaway heating. But I don’t think we can say the same for the economic system, which is equally as critical to humanity, and DOES exhibit tipping points, which can be quite drastic.
If we were suddenly pump huge amounts of Hydrogen into the chemical market, what would that do to prices and production? It could destabilise things badly. And our civilisation depends on chemical engineering…
I am sure you will join with me in calling for the Precautionary Principle to be applied here, and all such experimentation to be made illegal until the economic impact of these proposals has been precisely determined…..
“If we were suddenly pump huge amounts of Hydrogen into the chemical market, what would that do to prices and production?”
I think it would lift the market 🙂 But it seems likely that it could be used to reduce CO2 to methane, if necessary. Or make ammonia.
Alas, I have learnt my lessons from the Climate Activists. ‘Thinking’ is not enough. We need indisputable proof that the market will continue to run as before, with no disturbance of any kind that could conceivably cause distress to anyone. Failing that, the Precautionary Principle still applies.
Oh, and saying that it could be used to make methane or ammonia still runs into the objection that putting extra NH3 or CH4 onto the market would be just as disruptive. Worse – if we made NH3 we would suppress the current H2 production, which has CO2 as a by-product. You may be aware that there is a big CO2 shortage in the UK at the moment – https://www.bbc.co.uk/news/business-44613652
It looks like we are going to starve to death due to not enough CO2…
“But it seems likely that it could be used to reduce CO2 to methane”
In the long run, there may be something to that Nick. In the very long run, our great, great, ever_so_great grandchildren will probably need to run a planet of electricity — wind, solar, nucliar, fusion .. whatever. I’m beginning to think that batteries might be so ill-suited to the job of storing the energy to run a modern civilization that converting electricity to hycrocarbon (probably liquid) fuels will be the preferred answer.
But many decades of R&D would be required.
You can consider any method of obtaining electricity as getting it out of storage of one kind or another – chemical storage or potential kinetic energy…
…but note one thing – it is very dangerous to store lots of energy in one place – especially if it is easily converted….
True enough, but humanity has a lot of experience with liquid fuels. Some are very touchy. But many of them are pretty well behaved. How often do we see an entire parking garage go up in flames even though there might be a goodly part of a billion BTU of gasoline/diesel potential energy stashed in the vehicle fuel tanks.
Aluminum is useful and in demand.
Why not just plant more trees? Why not just dust the oceans with tiny amounts of iron to spur plankton growth? Build more artificial reefs? If the greenies were really serious about climate change ™ they would stop with the super climate change weapon programs, and promote the things that most people can agree with even if they know AGW is a scam, as trees are just about always good, and sea life could use a boost because global fishing is not going to decrease.
I think trees are not as efficient as dusting the iron-poor regions of the ocean with iron oxide. The effect is double: absorbs a huge amount of CO2 at low cost, creates a huge amount of biological activity, and feeds creatures that make shells. Those shells fall to the bottom of the ocean.
If the goal is to artificially set the CO2 concentration of the atmosphere at its recent near-record low, one can also ask what the ocean pH should be. If we have god-like powers to make and manipulate Creation, we might as well hold opinions on what the pH of the oceans should be. If we are going to be arrogant, no half-measures, eh?
JimG : I really LIKE YOUR IDEA OF creating ARTIFICIAL REEFS !
They will not only PROTECT COASTLINES from STORMS and EROSION but
provide FISH HABITAT for building up future fish-stocks …FOREVER !!
LOTS of the current LANDFILL RUBBISH could be rendered INSOLUBLE and
strategically DEPOSITED on the sea-floor , and just like the ships that are
deliberately sunk to create “dive-wrecks” , would serve a useful purpose as
a FISH HABITAT…….even CORALS would grow on them !!
Build OUR OWN BARRIER REEFS……..encourage tourism ! What a winner !
This would provide ( AT VERY LITTLE COST ) a resource that could be used
to benefit amateur and professional fishermen alike !
FRUIT and NUT TREES are good too…. but PASTURE and CROPS ARE BETTER !
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Dusting the Oceans with iron-ore SEEMS hazardous to me in that there are
an AWFUL ( in every sense of that word ) LOT of people who subscribe to the
theory that “if a little is good , then a whole lot MUST be better ! ”
Small scale I don’t see it as a problem….large scale use worries me !
.
THE Scheme: ” ‘Electrogeochemistry’ captures carbon, produces fuel,
offsets ocean acidification ” IS ABSOLUTE BOLLOCKS !
Another VASTLY EXPENSIVE , “Promising….but FAILED ”
PIE-IN-THE-SKY scheme in the making !
A bit like Australia’s ONE DAY CRICKET TEAM at present !!!
( and I NEVER thought I’d ever write that down anywhere !! )
Are end of life wind turbines suitable material for artificial reefs?
Which is merely proof that it’s not about the climate. It’ about control.
I hit the link to the article and got the abstract and references, the paper requires subscription.
Nonetheless, their reference 17 is a paper by the same lead author, and gives some details of the chemistry.
Here is the overall general idea:
They take mineral calcium carbonate and through electrolysis convert to calcium hydroxide and carbon dioxide. The pH is adjusted and then the hydroxide is converted to bicarbonate.
Here is the overall balanced reaction:
CaCO3 + CO2 == Ca(HCO3)2
Overall theoretical energy cost is given as 266 KJ/Mol per net CO2 consumed.
Then, they seem to think that dumping the produced bicarbonate into the ocean is a good idea. Seems like that would saturate the ocean carbon sink.
Now where to find the calcium carbonate? Ah yes, the ocean floor!
TonyL, electrolysis of mineral calcium carbonate is impossible because of its very low solubility in water.
This idea is as quack as a perpetual motion machine, say, of the first kind.
Um…no its not. It requires lots of electricity to separate water, and you can get some energy back when you recombine it. But, the losses are huge and attempting to store energy this way is years off. Definitely NOT perpetual motion, nor in violation of the laws of physics or thermodynamics.
This is just another means of electro-chemical energy storage. Many years ago I had proposed a “water battery”. The efficiency is not good. Recently some researchers from MIT posted a paper regarding an catalyst which would improve the separation of water into H2 and O2. This improved the efficiency, but still not to a level of practicality.
Not quackery, just impractical at the moment, and definitely “not-ready-for-prime-time”.
Environmentalist hucksters don’t seem the understand the concept of pyrrhic victory.
I wonder how well this process will work when powered by intermittent (renewable) energy. Did the lab experiments use steady (fossil) energy or intermittent energy? My money is on the former. If so, they are fooling themselves, and want to fool us as well.
GIGO
Perhaps the authors would gain from a course in Botany, then they would not only know that plants do the same fixing of carbon from atmospheric carbon dioxide for free. _And_ that removing carbon dioxide from the atmosphere is a really risky thing to do as the amount in the atmosphere is only just sufficient for plants to grow well, reduce it and bring on world hunger. But then that may be what they want.
“that plants do the same fixing of carbon from atmospheric carbon dioxide for free” Now how do you plan to get a big government grant with silly talk like that? Geez, we’re trying to save the whole planet here.
And according to global warming theory, it would make Canada colder. Brrrrr.
Plants indeed do this well, but it is NOT free. They are using solar energy to accomplish the feat. Additionally plants require water and ground space to accomplish the task. These resources, land space, water, and solar energy any of which could be used for another purpose.
The attendant cost-of-opportunity must be factored as well for proper accounting.
While these costs (of using the resources for plants) in some regions are extremely low they are not zero, and in some areas are prohibitive.
We don’t ought not be as sloppy with accounting as we decry in others.
One day someone will discover/create a mechanism for stripping CO2 from the atmosphere. Then we will all die!
Richard Hill : There ALREADY IS a method.
See comments by JimG above :
Just add IRON ORE DUST to the oceans , creates massive algal blooms , absorbs massive
amounts of CO2 , phytoplankton live and then die , fall to bottom of ocean taking
CaCO3 with them ( makes more limestone material in shallow seas ) and the CO2
level drops drastically , then to quote you “Then we will all die!”
Plants first……..animals next !!
(maybe NOT the cockroaches though !!?? )
.
HINT : Let us NOT ALLOW THAT !!!
I will bet almost none of the algae sinks to the floor. I bet a lot of dead algae floats as I am guessing most organic matter has a density less than water. Most of it will decay back into CO2 and water. A chunk will be consumed by zooplankton and enter the food chain which is OK but again I suspect most of this biomass will circulate within the top layer of the sea. Even what small portion does sink to the bottom will still be consumed by microfauna and flora before it ever mineralizes.
There is enough CO2 being added to the atmosphere to seed iron in every major fishery in the world at an ideal level with no decline in atmospheric CO2. Please don’t adopt the left’s alarmist tactics.
The Underpants Gnomes have nothing on the Climate Change Fairies…
1 – Join a University
2 – Think of a chemical process that uses CO2
3 – ?*
4 – Profit!
* ? = Submit a Grant Application
…. and you, sir, have stated the exact process now in place.
DJ (and dodgy) you forgot the last step(s)- “Repeat 3 & 4 above.”
+1 for the South Park reference.
If this is such a great idea they should easily be able to attract investors, no need to steal American tax dollars. Quick! Someone email them a link to gofundme!
“The process uses electricity from a renewable energy source for electrolysis of saline water to generate hydrogen and oxygen”. That reaction would be a great revelation to the designers and operators of chlor/alkali plants worldwide. The direct products from the electrolysis of saline are:
1..chlorine gas
2..sodium hydroxide
3..hydrogen gas.
Indirect products are:
1..sodium hypochlorite (bleach)
2..hydrochloric acid.
Where does the oxygen come from?
“Where does the oxygen come from?”
There are alternative possible anode reactions:
2Cl⁻ → Cl₂ + 2e
2H₂O → O₂ + 4H⁺ + 4e
They could have fiddled with concentrations and pH to favor one or other. Sounds like they have CaCO₃ in the anode region, which would favor the second.
But it is very like the chloralkali process. It seems to me pretty like just making NaOH in the regular way, and then letting that absorb CO₂.
And there is an oversupply of Hg available for the cathode cell. /sarc
The chloride ion is mainly discharged at the anode. Oxygen is present as an insignificant admixture. https://www.chemguide.co.uk/inorganic/group7/diaphragmcell.html
In the absence of diaphragm, cathode and anode products are mixed, forming hypochlorite.
Richard, do you have a reference for that? This suggests first tht the water must be purified, an extra cost no?
assume we have an energy source that produces no emissions and is relatively cheap to build
would we 1. sequester 2 carbon or would we use it to improve the lives of the many poor people on earth who don’t have electricity
well obviously 1. if you are the authors of this paper
Why is the U.S. Naval Research Laboratory involved in this? Have they studied powering their aircraft carriers with wind?
The Navy has been toying with the idea of producing synthetic jet grade hydrocarbon fuel aboard it’s nuclear powered aircraft carriers by combining H2 aquired by electrolysis of seawater using electricity genenerated by the carriers reactors with CO2 drawn from the athmosphere. The NLR guy in the group of authors of this paper is or has probably been active member of some research or feasibility study project team at NRL looking into that kind of thing.
Aircraft carriers are nuclear powered but the aircraft need fuel. Today ships full of fuel follow the aircraft carriers and periodically transfer fuel onto the carrier. The navy would like an electrically powered process that extracts CO@ur momisugly and H2 from water to make jet fuel.
That way nuclear power and power the ships and aircraft without the need for fuel supply ships. Even smaller ships (destroyers and cruisers) consume a lot of fuel to power they helicopters they carry and the fuel is also used to power the ship. Future small ships could be powered by nuclear reactors and also manufacture the fuel for the helicopters.
The process could also convert excess renewable power to methane which would be stored in existing storage facilities and used to produce power when renewables cannot.
One wonders if these academics ever try their concepts?
Our military used battery operated chlorine generators for sterilizing water for consumption.
Similar devices are available to backpackers, firefighters, etc.
Even wiki recognizes this:
More from wiki:
We are always thrilled to see safe processes suggested by CAGW supporters…
Rau claims his process increases “energy generation”, which is a sly hint his scheme requires greater energy than local available supply.
Rau’s delusional claim regarding “increase energy generation” is where Rau and his chums claim responsibility for the construction and expansion of renewable energy generating sources his process requires.
i.e. Rau’s dreamland requires substantial expansion of wind and solar farms; carpeting the world with land intensive short lived bird/bat killing infrastructure
N.B., that Rau never details his whole electrogeochemical process in the abstract; where Rau’s public relations focus is on renewable energy and alleged carbon sequestration.
The basic process as described by wiki:
No carbon molecules necessary.
Amongst Rau’s references, this research is referenced:
Leaving us to presume that Rau’s process is dependent upon complex energy intensive process.
One notes that one of Rau’s references to research by S. Licht:
How sweet! Isn’t that an impressive amalgamation of energy draining processes?
e.g.:
“driven by solar thermal heated“, Heat the process!
“endothermic electrolyses“, Induce reactions that absorb energy, thus cooling the process? Triggering that endothermic process must require additional reactants.
Note the plural electrolyses, signifying multiple separate electrolysis portions of the process.
“concentrated reactants“, Here is where they slip in that the process requires reactants to be concentrated. Concentrating the reactants in oceanic salt water is not a small operation.
Well, Doh!
These yahoos claim to have performed this experiment in a laboratory.
Of course, more funding for dreamland experimentation, so they can make far fetched claims via press release science.
Another example of; “Those who can, do.” “Those can’t, teach.”
It’s called a boondoggle.
At least they used a laboratory, not ‘cutting edge computer models’……..
“Our military used battery operated chlorine generators for sterilizing water for consumption.”
Is this a positive or a negative?
A hand held reverse osmosis device is cheaper to buy, cheaper to operate, works faster, removes more poisons from the water and the result doesn’t smell like chlorine.
Why not use the renewable energy directly on the grid to displace fossil fueled energy instead of going through all of this energy wasting processing? You lose energy with every step.
Now all we have to worry about is making the ocean too caustic with this perpetual motion machine. Or the transcontinental hydrogen pipelines.
I thought I could smell something burning.
Yet another expensive, energy intensive ‘solution’ to a problem that the laws of physics precludes from occurring. The opportunity costs of this foolishness are staggering. There are so many far more important issues to be spending money on.
“The issues are how to supply enough biomass”
So now the greenies want to take us back to the year 1000 BC when everybody was burning wood to keep warm and for cooking. Do they realize that you could harvest all the available land for biomass on the planet and not make a dent in the energy needs of 7.6 billion people?
Fundamentally, that is the problem.
The idea here seems to be that we could re-capture the CO2 released by fossil fuels, but we would need an unlimited source of emissions-free energy. If we had that, we wouldn’t need fossil fuels in the first place. Nonsense.
Is a tree a “negative emission technology”? Because that’s not a new thing.
The entropy changes at each chemical step alone would make this process a loser. This is without taking into account the mechanical losses. How many times in a month do we see this same ridiculous, quasi-perpetual-motion renewable energy solution to a fake problem. It’s like somebody is using a fill-in-the-blank form to generate this fake research.
Ohhh…I finally get it! I HAVE GOT THE REAL SOLUTION! Here it is!!! You’re going to love this! …………. I have some little white tablets. They are only a $1.00 a piece. Toss one in the tank, add any water-containing liquid(🤔🤓) and drive 500 miles. Take along a case of your favorite beer to make the process even more environmentally friendly. Drink it responsibly. I can make beer too!!!! My beer will be the most efficient.
Why didn’t I see this before? I am a genius!!!! What should I name the pill or the beer? See you later, I finally have some real solutions to a deadly global problem!!! Maybe I can get a government start-up grant! Hey… Al… hold up a second…