Capture of CO2, the return ...

Warming and Climate Change: causes, consequences, analysis ... Debate on CO2 and other greenhouse gas.
moinsdewatt
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by moinsdewatt » 17/01/15, 14:12

RV-P wrote:- In any case, if I "bring back my strawberry" about the Bible, it "gives buttons" to some on this forum : Shock: !!!
- Do not confuse "Bible" and "religion", please: it has nothing to do!
- And if you happen to have the curiosity to open it and read it, the Bible, huh?! ?? Just to contradict her ... Chiche?
sen no sen wrote:There has never been a Flood exterminating the entire terrestrial animal and human population!

- According to you, in islands off Siberia, we found a whole lot of mammoth bones and tusks! We even found a whole in the permafrost of Siberia! If they weren't "frozen in place" by a global climate catastrophe, what froze them in place, then?! ?? ...


and he continues his ride. it's intolerable.

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sunins834
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by sunins834 » 21/01/15, 08:26

but we have no solution in effect.
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by sunins834 » 23/01/15, 04:37

sunins834 wrote:but we have no solution in effect.






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moinsdewatt
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by moinsdewatt » 23/01/15, 21:19

RV-P wrote: [....- Moreover, as we are all hydrates of ... CARBON, the mere fact that we breathe also introduces CO2 in the atmosphere! Not to mention animals ... But 7 billions of people who breathe, it must make a lot of tons of CO2!


Image gross error.

The CO2 that we exhale comes from our food, which comes from animals (which comes from plants) or plants, and comes from the atmosphere.
Carbon runs in a loop, and the overall balance is completely neutral in steady state.
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Re: CO2 capture, the return...




by Christophe » 04/02/22, 17:29

I post it here: https://trustmyscience.com/chercheurs-p ... t-co2-air/

A revolutionary method to extract 99% of CO2 from the air

Hydroxide exchange membrane fuel cells are currently being investigated as an alternative to traditional fuel cells. They would indeed be more economical and more ecological than the batteries used today. However, they have the disadvantage of being extremely sensitive to carbon dioxide in the air, which reduces their performance. After more than 15 years of research, a group of scientists decides to take advantage of this obstacle and proposes a particularly profitable solution allowing to extract 99% of the CO2 present in the air.

A fuel cell generates an electric voltage thanks to the oxidation of a reducing fuel (for example dihydrogen) coupled with the reduction of an oxidant, such as oxygen from the air. It consists of two bipolar plates (one which distributes hydrogen, the other which distributes oxygen), two electrodes and an ion exchange membrane (which acts as an electrolyte). Additionally, the oxidation is usually catalyzed by platinum. But this metal is rare and expensive, which is why scientists are looking for alternatives.

Unlike traditional batteries whose electrolyte is acidic (H+ ions), hydroxide exchange membrane (HEM) fuel cells involve an alkaline environment which allows the use of more cost-effective catalysts and bipolar plates. However, their operation is largely impacted by ambient CO2, which prevents the battery from operating optimally. This problem induces up to 20% performance drop, according to the researchers. Professor Yushan Yan, and his team at the Center for Catalytic Science and Technology at the University of Delaware, realized that this drawback could actually serve to remove carbon dioxide from the air.*

Screenshot 2022-02-04 at 17-29-36 A revolutionary method to extract 99% of CO2 from the air.png
Screenshot 2022-02-04 at 17-29-36 A revolutionary method to extract 99% of CO2 from the air.png (247.98 KiB) Viewed 2604 times


To achieve this high level of efficiency, they integrated a short-circuited membrane into the electrochemical system, which conducts both anions (CO32-) and electrons. The device is powered by hydrogen, like a fuel cell, but does not require electrical wires, bipolar plates or current collectors, and can therefore be modulated like a typical separation membrane, the team explains in the NatureEnergy magazine.

A very efficient and economical device

Integrating the wires of the device directly inside the membrane has made it possible to develop a more compact module, rolled up on itself – and thus to have a larger exchange surface while limiting the volume. This structure also allows carbon dioxide particles to move more easily from side to side; the module is therefore able to filter larger quantities of air at a time.

The results show that an electrochemical cell with a short-circuited membrane of 25 cm² can eliminate more than 99% of the CO2 present in the air, whose flow rate is 2000 cm³/min, for 450 hours, and can operate efficiently under dynamic load following conditions. An early prototype of the device, the size of a soda can, was found to be able to filter 10 liters of air per minute removing more than 98% of carbon dioxide, the researchers added. For an automotive application, the device would be about the size of a gallon of milk (or about 3,7 liters), Setzler said.

This innovative system therefore appears to be both efficient and profitable for fuel cell applications. In addition, the reduction in the number of components required leads to a significant reduction in costs and, above all, makes it possible to envisage a rapid entry into the market. "Our techno-economic analysis indicates that a compact module capable of removing more than 99% of CO2 costs $112 for an 80 kWnet HEM stack," the study authors state.

Of course, such a device could also be used to remove carbon dioxide in other contexts. The team notably evokes the possibility of installing it on board spaceships or submarines, where the continuous filtration of the air is essential. It could also be put to good use in airplanes and buildings, where air recirculation is one of the energy saving measures envisaged.


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Re: CO2 capture, the return...




by izentrop » 09/09/22, 01:35

Restoring Wetlands...
Blue carbon refers to carbon stored in coastal and marine ecosystems such as mangroves, tidal marshes and seagrass beds. International research has shown that these ecosystems can store two to four times more carbon than terrestrial forest systems, and are estimated to boast a rate of carbon sequestration up to 100 times faster.
https://thespinoff.co.nz/partner/09-09- ... ponsored-1
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Re: CO2 capture, the return...




by GuyGadeboisTheBack » 09/09/22, 01:39

izentrop wrote:Restoring Wetlands...

By pumping groundwater to fill basins and drain (among other things) the Poitevin marshes? : Evil:
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Re: CO2 capture, the return...




by izentrop » 09/09/22, 02:00

GuyGadeboisLeRetour wrote:
izentrop wrote:Restoring Wetlands...
By pumping groundwater to fill basins and drain (among other things) the Poitevin marshes? : Evil:
This is the narrow-minded green vision, a study has shown that this was not the case.

The chosen solution is not perfect, but economically viable.
This year's drought shows us once again that we will have to find technical solutions to ensure the production of food, which is in line with efficient carbon storage...
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Re: CO2 capture, the return...




by GuyGadeboisTheBack » 09/09/22, 02:29

izentrop wrote:This is the narrow-minded green vision, a study has shown that this was not the case.

If this is the study I'm thinking of, you know I know you know it sucks. : Mrgreen:
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