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How to separate CO2 into C and O2

by Jacquesl
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Jacquesl
#1
Feb5-07, 04:33 PM
P: 136
How to separate CO2 into C and O2, how can this be done, will this require, much energy?
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cesiumfrog
#2
Feb5-07, 06:41 PM
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heh. this is chemistry (even biology), not physics.
AlphaNumeric
#3
Feb5-07, 07:11 PM
P: 290
Yes, it requires a lot of energy. Burning things like coal is effectively going the opposite way, C + O2 -> CO2. Then think how much power our civilisation has got and is getting from coal.

trajan22
#4
Feb5-07, 07:13 PM
P: 155
How to separate CO2 into C and O2

If you can solve this then you've solved global warming. :)
Gokul43201
#5
Feb5-07, 07:58 PM
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Quote Quote by Jacquesl View Post
How to separate CO2 into C and O2, how can this be done, will this require, much energy?
Heat it, it takes 393.5 kJ/mol.

http://webbook.nist.gov/cgi/cbook.cg...nits=SI&Mask=1
chemisttree
#6
Feb7-07, 04:50 PM
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The easiest way is to feed it to a plant. It converts the carbon to carbohydrate which can then be carbonized by heat in the absence of air or by strong sulfuric acid. Oxygen is produced when light is present.

Alternatively, you could heat CO2 over a catalyst of iron doped zeolite and hydrogen to produce water and ethylene. A nonthermal plasma applied to ethylene will generate carbon soot and recover the hydrogen. Electrolysis of water gives back the extra hydrogen and produces oxygen. (Hey! I didn't say it was efficient.) It might be useful to someone on Mars who has endless power in the form of a nuclear reactor and plenty of CO2 but not so much oxygen.
Jacquesl
#7
Feb8-07, 02:36 AM
P: 136
Oxygen is produced when light is present.
Nice man, NASA must actually start a Amazon in the space station with dozens of trees with a sun roof on top the station for the light. And use the human waste for plant food and the water I’m not so sure yet.
What happens then plants doesn’t get CO2 ? does it die?
So just by burning some Carbon containing stuff I can make a dish of plant gasses, called CO2, and that can then me converted back to O2 and the C is absorb by the plant to make glucose, with the presence of water.

But this idea from you sounds brilliant, but like you’ve said, you will need unlimited energy for that current hungry Electrolysis

you could heat CO2 over a catalyst of iron doped zeolite and hydrogen to produce water and ethylene
If hydrogen exist 75% in space, can it be used by tapping into that source

I’m not understanding that “catalyst of iron doped zeolite”
chemisttree
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Feb8-07, 09:31 AM
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Not my idea. The idea of using photosynthesis in space to produce oxygen from CO2 and water has been around a very long time. Converting CO2 to oxygen (abiotically) is currently being investigated by NASA as a source of Oxygen on the manned mission to Mars.

Zeolites are inorganic cage structures of aluminosilicates. Some synthetic varieties can be based on phosphorous and silica as well. The cage structures have sites where cations reside. Usually these cations are simply sodium or potassium but they can be exchanged for other cations such as calcium and magnesium. The cavities in the cage structure are large enough in some cases to trap and hold fairly large species. If a transition metal species is allowed to occupy some of the space, you have the potential to have a catalytic reaction site. Zeolites are used in this way (and other ways) as catalysts. The most common use for zeolites is in the form of cat litter. It seems that zeolites have an affinity to ammonia and thus minimize the odor from the litterbox. Another use for zeolite is to soften water by exchanging divalent metals (calcium, magnesium) for sodium. It is usually present in powdered laundry detergents and in that role is known as a detergent "builder".
mormar
#9
Feb8-07, 09:56 AM
P: 2
Single a question, is not important but...

Catalyst is an substance wich increases the rate of the reaction.

I think, It is important to catalize the reaction because the rate of reaction is low. We can increases the rate of reaction increases the T but this is problematic, another wished reaction cannot compete.
Jacquesl
#10
Feb8-07, 10:46 AM
P: 136
Ok, thanks I just want to make sure I just wanted to make sure that Im not understand the terms wrong.


In chemistry and biology, catalysis is the acceleration (increase in rate) or slowing down of a chemical reaction by means of a substance, called a catalyst,

Lets just leave this for NASA Im no challenge for them on this topic
haiha
#11
Feb8-07, 02:53 PM
P: 137
The following reaction is used in submarines to recyle CO2 and release O2:

Na2O2 + CO2 -----> Na2CO3 + 1/2O2
southeng
#12
Feb14-07, 05:59 PM
P: 1
not considering the cost of electricity, is it possible to seperate co2 by adding only electrical energy?
chemisttree
#13
Feb14-07, 06:24 PM
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Oxygen can be isolated but carbon monoxide is the final carbon containing product.

http://www.sbir.nasa.gov/SBIR/abstra...nId=SBIR_05_P1

http://neptune.spaceports.com/~helmu...resources.html
TripleS
#14
Feb24-07, 08:55 PM
P: 22
Quote Quote by Jacquesl View Post
If hydrogen exist 75% in space, can it be used by tapping into that source
the hydrogen in space is spread out in a very large area, and for us to tap into nebula or other large clouds of hydrogen that isn't already in fusion..our space exporation would have to be very much better than it is at the present moment.
frankferg
#15
Sep10-08, 02:16 PM
P: 1
How about using the Hutchison effect?
Borek
#16
Sep10-08, 02:42 PM
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Speaking of crackpottery... you can use tweezers to separate carbon and oxide. Just pull in opposite directions.
1ducky3
#17
Jun10-10, 09:40 PM
P: 1
I think a way to seperate them is by mixing it with something else that would be like CO2 + ? --> C? + O2, and it should be something better than Carbon Dioxide, i've taught about this, and im just getting into high school, and im gonna study chemistry for 2 years.
PaulS1950
#18
Jun11-10, 04:27 AM
P: 151
Don't the CO2 scrubbers in re-breathers and in spacecraft use activated charcoal to capture the carbon and release the oxygen?


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