Bosch reaction

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.
$CO_{2}+2H_{2}\rightarrow C+2H_{2}O+heat$

Uses

• Preventing toxic carbon dioxide buildup in a spacecraft atmosphere.
• 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 net 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 would allow 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.
• 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.

See also

• Sabatier process
• Reverse Water-Gas Shift Reaction
• Charcoal