energy proﬁ le of the catalytic ammonia synthesis · the catalytic reaction of ammonia synthesis...

1

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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Page 1: Energy proﬁ le of the catalytic ammonia synthesis · The catalytic reaction of ammonia synthesis on iron catalysts in individual steps: The adsorption and separation of N 2 and

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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