Z. Kowalczyk et al., STUDIES ON KINETICS OF AMMONIA-SYNTHESIS OVER RUTHENIUM CATALYST SUPPORTED ON ACTIVE-CARBON, Applied catalysis. A, General, 138(1), 1996, pp. 83-91
The rate of ammonia synthesis was measured for ruthenium and iron cata
lysts under high (100 bar) and under atmospheric pressures. The effect
of ammonia concentration in the gas phase on reaction rate was measur
ed at 400, 430, and 470 degrees C for p = 100 bar at 370 and 400 degre
es C for p = 1 bar. It was found that ruthenium is less sensitive than
iron to the increase of ammonia pressure in the gas phase. It is also
much less sensitive to changes in the total pressure (for p(H2):p(N2)
= const.). At relatively high conversion degrees the ruthenium cataly
st used was several times more active than the fused iron catalyst at
100 bar and 25-40 times more active under atmospheric pressure.