Fortunately, linear scaling relationships provide a simple and computationally efficient way to estimate adsorption energies. Descriptor-based analysis using tools such as CatMAP allows parameters in microkinetic models to be related to one or two descriptors of a surface, such as atomic binding energies. Abild-Pedersen et al. have shown the adsorption energies of hydrogen-containing molecules of carbon, oxygen, sulfur, and nitrogen on transition metal surfaces scale linearly with the adsorption energy of the surface-bonded atom. The adsorption energy of a species AH x with central atom A (e.g. C, O, S, or N) is shown as: