How to separate CO2 into C and O2

heh. this is chemistry (even biology), not physics.

 

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.

 

If you can solve this then you've solved global warming. :)

 

Heat it, it takes 393.5 kJ/mol.

http://webbook.nist.gov/cgi/cbook.cgi?ID=C124389&Units=SI&Mask=1

 

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.

 

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".

 

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.

 

The following reaction is used in submarines to recyle CO2 and release O2:

Na2O2 + CO2 -----> Na2CO3 + 1/2O2

 

not considering the cost of electricity, is it possible to seperate co2 by adding only electrical energy?

 

Oxygen can be isolated but carbon monoxide is the final carbon containing product.

http://www.sbir.nasa.gov/SBIR/abstr...5-1-X9.01-8156.html?solicitationId=SBIR_05_P1

http://neptune.spaceports.com/~helm...egy1/2_5_3_utilization_martian_resources.html

 

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.

 

How about using the Hutchison effect?

 

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.

 

Don't the CO2 scrubbers in re-breathers and in spacecraft use activated charcoal to capture the carbon and release the oxygen?

 

They use a strong base like lithium hydroxide. It absorbs the CO2 converting it to Li2CO3.

 

Can just heating it do the job?
C + O2 --> CO2 + energy released
CO2 + energy added --> C + O2

 

i read something somewhere about 'magic mist'... the website basically promoted the mist technology claiming, in essence, that if you want to capture 100 molecules of carbon from co2, then you would need to spray them with 100 little dropletz of h2o, same sized. im no chemist... but sound a bit to easy to be true...

what about water filtration though? wouldnt that extract the carbon?

sorry im just curious...

 

If you used a focused light beam (laser) it would (theoretically) be plausible (with an atomic force microscope)

 

This statement makes no sense. An AFM does not, for instance, shoot out a laser beam at the sample.

 

It can but I don't think that laser tweezering is being performed. You can Google "AFM Tip-Assisted Optics" and see some commercial equipment that can perform Raman spectroscopy (which uses a laser) during an AFM scan.