To obtain a model that more accurately describes the reaction, following two types of reaction models were compared: a model that ignores the ammonia adsorption reaction and the reverse reaction in the RDS (Model I, see SI) and a model that considers the ammonia adsorption reaction and the reverse reaction in the RDS (Model II). The same results were fitted with different reaction models, and the model that more accurately described the reaction defined as the one that the R 2 value is closer to 1 in the RDS, and that model was used for the fitting with other experimental results.