Plenty of experimental kinetic data for KM1R is represented by the simple Temkin equation. However, the Temkin equation cannot describe the experimental kinetic data for Ru-based catalysts well because the reaction over Ru-based catalysts is inhibited by hydrogen poisoning while the reaction over Fe-based catalysts is inhibited by ammonia poisoning. Buzzi et al. considered 23 possible kinetic models by the Langmuir-Hinshelwood-Hougen-Watson (LHHW) approach, separating the reaction into elementary reaction steps and expressing the overall reaction as the slowest step rate. Rossetti et al. modified the Temkin equation to successfully represent the experimental kinetic data for Ru/C catalyst by the LHHW approach, which takes into account hydrogen poisoning. The modified-Temkin equation under the condition of the feeding ratio H2/N2 = 3 is the following: