Elementary Surface Reactions Adsorption and Sticking Determination of Sticking Coefficients Desorption Quantitative Interpretation of TPD Data Compensation Effect in Temperature Programmed Desorption Lateral Interactions in Surface Reactions Dissociation Reactions on Surfaces Intermediates in Surface Reactions Association Reactions Kinetic Parameters from Fitting Langmuir–Hinshelwood Models Micro-kinetic Modeling Reaction Scheme and Rate Expressions Activation Energy and Reaction Orders Ammonia Synthesis Catalyst under Working Conditions