In the case of Ru+K, 𝜃 N is smaller at lower temperatures like Ru. However, the temperature dependence of the other adsorbed species is significantly different from that of Ru. The ratio of adsorbed species (𝜃 V ∶ 𝜃 N 2 ∶ 𝜃 H ∶ 𝜃 NH 2 ∶ 𝜃 N ) also varies with temperature. Based on Table , the adsorbed species ratio at 460 and 440°C, where the RDS is step 6, are close, and those at 400 and 380°C, where the RDS is step 3, are also close (Figure , Table ). Thus, coverage changes as the RDS changes.