N₂(g) + 3H₂(g) ⇌ 2 NH₃(g), ∆H^Ɵ=−92kJmol⁻¹

optimum temp

450-500^oC

low temp shifts POE →, favour → rxn >

NH₃(g) yield ↑, but rate too slow @ low temp >

moderate temp(450-500^oC) allow reach POE @ higher rate while relatively high yield

optimum pressure

200-250atm

high pressure shifts POE →, favour → rxn >

NH₃(g) yield ↑, reach POE ↑, but too ex >

moderate pressure(200-250atm) allow relatively high yield @ low cost

catalyst

finely divided Fe catalyst

reach POE @ faster rate; catalyst ↑ rate of both →/← rxn by same extent >

yield constant

Review: H2 Chemistry 8 - Chemical Equilibrium