Energy in kJ/mol 0 N 2 H 2 H 2 N 2* NH 2* NH 3* NH 3 0.5 N 2 + 1.5 H 2 0.5 N 2* + 1.5 H 2 N * + 3 H * NH * + 2 H * NH 2* + H * NH 3* NH 3 –100 – 200 – 300 N * H * H * H * NH * The catalytic reaction of ammonia synthesis on iron catalysts in individual steps: The adsorption and separation of N 2 and H 2 at the catalyst liberates a relatively high amount of energy which is largely consumed in the production of ammonia and on leaving the catalyst. (Source: Chemie in unserer Zeit, 2006) Energy profile of the catalytic ammonia synthesis molecules and atoms bonded to the catalyst catalyst * nitrogen (N 2 ) hydrogen (H 2 )
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Ene
rgy
in k
J/m
ol
0
N2
H2 H2
N2* NH2* NH3*
NH3
0.5 N2 + 1.5 H2
0.5 N2* + 1.5 H2
N* + 3 H*
NH* + 2 H*
NH2* + H*
NH3*
NH3
–100
– 200
– 300
N* H* H* H*NH*
The catalytic reaction of ammonia synthesis on iron catalysts in individual steps: The adsorption and
separation of N2 and H2 at the catalyst liberates a relatively high amount of energy which is largely consumed
in the production of ammonia and on leaving the catalyst. (Source: Chemie in unserer Zeit, 2006)
Energy profi le of the catalytic ammonia synthesis
molecules and atoms bonded to the catalyst
catalyst*nitrogen (N2 )
hydrogen (H2 )
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