Efficiency at Different Reaction Conditions

The dependence of the synthesis conversion upon temperature, pressure, space velocity, and ratio of hydrogen to nitrogen reported below 

The data can be considered relevant for the changes in performance to be expected from changes of synthesis conditions in many industrial installations. 

By conversion percentage will be understood the percentage of ammonia by volume in the exit gas. By catalyst efficiency is understood, according to Larson and Tour (68), the ratio of the actual percent ammonia in the gas to that theoretically possible under the conditions in question. Equilibrium percentages used for calculation of efficiencies have been obtained from a nomograph constructed by Toniolo and Giammarco (74). 

The effect of a change in temperature is a double one, as it affects both equilibrium percentage and reaction rate. While catalyst efficiency 

The equilibrium ammonia percentage increases with pressure and so does the rate of conversion. Hence, it is impossible to know beforehand 

---