GCSE Chemistry (AQA)

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The Haber Process

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Using resources The Haber process and the use of NPK fertilisers

The Haber Process

4:58 The Haber Process
Spec 4.10.4.1
Previous Making NPK Fertilisers Next The Haber Process: Equilibrium
  • Nitrogen-based fertilizers are produced using ammonia.
  • Fertilizers help plant growth and increase crop yield.
  • Ammonia production is crucial to meet fertilizer demand.
  • Ammonia is a covalent compound with the formula NH3.
  • Ammonia is manufactured using the Haber process, developed by Fritz Haber and Carl Bosch.
  • In the Haber process, nitrogen and hydrogen react to form ammonia.
  • Nitrogen is sourced from the air; hydrogen is primarily extracted from methane (CH4).
  • The reaction uses a double-ended arrow, indicating it is reversible.
  • Purified nitrogen and hydrogen are passed over an iron catalyst at high temperature and pressure.
  • The setup involves purified gases being pumped into a system where they react in a chamber with iron as a catalyst.
  • The catalyst lowers the activation energy, speeding up the reaction.
  • The chamber is kept at around 450��C and 200 atmospheres.
  • Some hydrogen and nitrogen react to form ammonia, but the reaction is reversible.
  • The reaction mixture is cooled to liquefy ammonia for removal.
  • Ammonia has a higher boiling point than hydrogen and nitrogen, allowing it to condense and be collected.
  • Unreacted hydrogen and nitrogen gases are recycled back into the reaction chamber.
  • Understanding the steps of the Haber process is important for exams.

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