the haber process
- Created by: Hannahisnotonfire
- Created on: 10-06-17 18:10
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- the Haber Process
- needs nitrogen and hydrogen
- nitrogen from air
- hydrogen from natural gas/ other sources e.g. crude oil
- some nitrogen + oxygen reacts to form ammonia
- reaction is reversible
- reaches an equlibrium
- gasses purified first
- industrial conditions
- pressure- 200 atmospheres
- temperature- 450 degrees c
- iron catalyst
- temp is a compromise between max yield and speed of reaction
- iron catalyst
- speeds up reaction- gets it to the equilibrium proportions more quickly
- does not affect position of equilibrium
- w/o catalyst temp must be raised even further
- 1) high pressure favours forward reaction
- pressure set high as possible to give best yield without making plant to expensive to build
- forward reaction is exothermic- increasing temp will push equilibrium wrong way
- yield will be greater at lower temp
- but lower temp is lower rate of reaction so compromise is made
- yield will be greater at lower temp
- forward reaction is exothermic- increasing temp will push equilibrium wrong way
- N 2(g) + 3H 2(g) 2NH 3(g) + heat
- needs nitrogen and hydrogen
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