Are There Any Process And Catalyst For Convert CO2 And H2O Into ...

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Learn more about Teams Are there any process and catalyst for convert CO2 and H2O into CH4 and O2 [duplicate] Ask Question Asked 6 years, 5 months ago Modified 6 years, 5 months ago Viewed 1k times -1 $\begingroup$ This question already has an answer here: Conversion of CO2 to methane (1 answer) Closed 6 years ago.

The equation is simple

$$\ce{CO2 + 2 H2O -> CH4 + 2 O2}$$

Yet, is it possible? Are there processes like heat, pressure, electricity, laser and/or any catalyst that could do this process directly?

And if it not possible then why it isn't?

• reaction-mechanism
• catalysis

Share Cite Improve this question Follow edited Jul 1, 2018 at 21:59 aventurin 7,28033 gold badges2727 silver badges3939 bronze badges asked Jul 1, 2018 at 15:52 ThainaThaina 13744 bronze badges $\endgroup$ 3

• $\begingroup$ Are you sure you are not looking for this? $\endgroup$ – Nilay Ghosh Commented Jul 2, 2018 at 8:09
• 1 $\begingroup$ See more: popularmechanics.com/science/green-tech/news/a27412/… phys.org/news/2017-07-carbon-dioxide-methane-iron-sunlight.html $\endgroup$ – Nilay Ghosh Commented Jul 2, 2018 at 8:10
• $\begingroup$ @NilayGhosh as closely as it seem, no, I was specifically want CarbonDioxide and Water to generate hydrocarbon and oxygen $\endgroup$ – Thaina Commented Jul 2, 2018 at 17:00

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It can be done but not in a way that makes much economic sense

The trouble with this reaction, however attractive it looks as a neat way to use up carbon dioxide, is that is requires a lot of energy. It is basically the reverse of the normal reaction of burning methane, which releases a lot of heat (this is what your cooker is doing if supplied by natural gas). So going in reverse requires an input of at least the same amount of heat.

The Sabatier reaction (which is one way to force the required process to happen) has been known since 1910. It requires both a catalyst (nickel or ruthenium based) and both high temperatures and pressures. This means there is little incentive to do it in most circumstances. It has been used in exotic locations (the International Space Station, for example, but there it is used to use up excess carbon dioxide and regenerate oxygen not to produce methane which is discarded).

So it is possible but not sensible to do the reaction in most circumstances.

If you really want to use up carbon dioxide and turn it into something more useful, then plant a tree. Plants have been turning carbon dioxide into useful products for more than a billion years using the sun's energy to drive the reaction.

Share Cite Improve this answer Follow answered Jul 2, 2018 at 13:30 matt_blackmatt_black 37.8k44 gold badges9191 silver badges184184 bronze badges $\endgroup$ 2

• $\begingroup$ Using a lot of energy is one thing I hope for the process. It means it could be used to store energy that highly fluctuate such as solar farm, if it could be economical sufficient $\endgroup$ – Thaina Commented Jul 2, 2018 at 17:09
• $\begingroup$ @Thaina There are lots of well known ways to store energy from fluctuating sources, some of them based on chemical reactions some on simple physical systems. Most are already far more efficient that a complex reaction like the Sabatier process could ever be. $\endgroup$ – matt_black Commented Jul 3, 2018 at 9:24

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3 Conversion of CO2 to methane

Related

24 Energy-efficiency aside, what are the chemical constraints on CO₂ capture and methanation? 3 Why must the forward reaction and the backward reaction follow the same pathway? 11 Chemical equation that can be balanced in infinite number of ways? 5 Intuition for why catalyst affects both forward and reverse reactions equally? 3 Kinetics of Sabatier reaction 1 How can a catalyst be selective if it does not change the equilibrium constants?

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