# Bosch reaction

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

## Uses

• Preventing toxic carbon dioxide buildup in a spacecraft atmosphere[2].
• 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).