In [[4]], Adamski et al. addressed the thermal stability problem of K-promoted cobalt molybdenum nitride catalysts as a critical factor in the practical application of catalysts. The potassium-free catalyst remained unchanged after the thermostability test, whereas the K-promoted catalysts lost their activity due to a decrease in surface area. There is an optimal cobalt particle size (20-30 nm) that ensures the highest activity of the cobalt catalyst in the ammonia synthesis reaction.