The Haber Process - Making Ammonia

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  • Created by: Katy **
  • Created on: 19-04-14 15:08
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  • Making Ammonia
    • Materials
      • Nitrogen gas (N2)
        • air
      • Hydrogen gas (H2)
        • natural gas
    • Nitrogen + Hydrogen ? Ammonia
      • N2(aq) + H2(aq) ? 2NH3(g)
      • reversible reaction
    • Reversible reaction
      • go forwards & backwards
      • when forwards & backwards are equal called equilibrium
      • amount of reactants & products not change
    • Temperature
      • Increase
        • reaction will decrease temperature
          • reaction goes backwards
        • rate of reaction increase
        • NH3 yield decrease
        • causes problem with yield & rate
      • Decrease
        • rate of reaction decrease
        • reaction will increase temperaure
          • reaction goes forwards
        • yield of NH3 increase
        • causes problems with yield & rate
      • yield & rate require different temperatures
        • moderate temperature used
          • 400-500'c
        • increase rate
          • iron catalyst
    • Pressure
      • Increase
        • reaction will decrease pressure
          • reaction goes forwards
        • yield of NH3 increase
        • rate of reaction increase
      • Decrease
        • reaction will increase pressure
          • reaction goes backwards
        • yield of NH3 decrease
        • rate of reaction decrease
      • at high pressure
        • 200-300 atmospheres
        • too expensive to achieve & dangerous
        • cost not balanced by increase in NH3 yield or rate
    • unreacted Nitrogen & hydrogen recycles in system
      • allows yield of NH3 to be relatively low
        • 15-40%
    • Iron catalyst
      • can become poisoned by impurites
      • stop working

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