What are the conditions for ammonia synthesis catalyst selection

It is important to consider both the consistency of the effect of external conditions on the rate of chemical reaction and chemical equilibrium, and the contradictory nature of the effect on both. The first consideration is to increase the rate of ammonia production. Measures that can accelerate the rate of a chemical reaction include: increasing the concentration of reactants, increasing the temperature, increasing the pressure, and using a catalyst. Then consider the extent to which the reaction proceeds, i.e., the rate of conversion of the reactants. Measures that can shift the chemical equilibrium in the direction of ammonia production are: increasing the concentration of reactants, decreasing the temperature, increasing the pressure, and decreasing the concentration of ammonia produced.

Combining these two measures, the effects of both on increasing the concentration of reactants and increasing the pressure are the same, but too much pressure is more demanding on the power and equipment, so it is important to choose the appropriate pressure.

Both the ambivalence of the effect of temperature on the rate of chemical reaction and chemical equilibrium should be taken into account, and the requirement of the activity of the catalyst on the temperature should be noted. Although the catalyst has no effect on the movement of chemical equilibrium, but can shorten the time used to reach chemical equilibrium, so the industrial ammonia synthesis of magnetite as the main multi-component catalyst, only in the temperature, both to consider the appropriate increase in temperature in order to facilitate the increase in the rate of the chemical reaction, but also consider the appropriate control of the temperature in order to facilitate the increase in the concentration of ammonia at the time of the equilibrium, but also to take into account the consideration of the catalyst's catalytic activity of the temperature range.