As shown in section 3.2, the experimental data reported in literature are unsuitable for practical use. Then, the extrapolated data of the reaction rate under 50 bar are utilized for the comparison. 0.0683 USD/kWh was utilized for the electricity cost. Figure shows the breakdown of the total cost for the ammonia synthesis loop at a 100 tonnes/day scale. The high pressure significantly improved the reaction rate of Ru/Ba-Ca(NH2)2. If the duration of Ru/Pr2O3 and Ru/Ba-Ca(NH2)2 are 10 years, the total cost is comparable with conventional catalysts. Yet, the advantages of new catalysts are not these conditions.