# Bosch reaction

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The Bosch reaction is the exothermic reduction of carbon dioxide by hydrogen in the presence of a catalyst such as nickel to form water and elemental carbon.[1]
${\displaystyle CO_{2}+2H_{2}\rightarrow C+2H_{2}O+heat}$

## Uses

• Preventing toxic carbon dioxide buildup in a spacecraft atmosphere[1].
• Provides a source of carbon.
• Results in production of either water or oxygen:
• If the hydrogen for the process must come from water (most likely by electrolysis), the Bosch reaction results in a nett release of oxygen for breathing, for water filter production, as a metallurgical additive or as a chemical reagent.
• Alternatively, in an Earth-supported colony that shipped molecular hydrogen from Earth, it allows water production from the Martian atmosphere (within the limits of available hydrogen).

## Disadvantages

• The catalyst requires regular cleaning or replacement due to the inhibiting effect of the layer of carbon that forms on it.[1]
• The reaction only takes place at a fairly high temperature and so places a drain on energy and thermal control resources in a spacecraft/colony.[1]

## References

1. W.J. Crump - Issues and solutions for short-duration flights: A historical perspective on physiochemical systems in S.E. Churchill ed. Fundamentals of space life sciences vol. 2. 1997. ISBN 0-89464-051-8 pp. 273-276.