# 5.4  In Haber's process, hydrogen is obtained by reacting methane with steam in the presence of a catalyst. The process is known as steam reforming. Why is it necessary to remove  $\ce {CO}$  when ammonia is obtained in Haber's process?

It is necessary to remove  $\dpi{80} \ce {CO}$  when ammonia is obtained in Haber's process because the $\dpi{80} \ce {CO}$ acts as a poison for iron catalyst so it can affect the activity of iron catalyst used in this process.