To make the CMPO model in RMG, the methane partial oxidation models developed by Quiceno et al. and Mhadeshwar and Vlachos 43 were chosen as the reaction libraries for modeling the surface reaction network, and the model developed by Burke and coworkers was used for gas-phase reactions. In order to provide the thermodynamics of the species, RMG relied on four libraries: SurfaceThermoPt111, primaryThermoLibrary, thermo DFT CCSDTF12 BAC, and DFT QCI thermo. These libraries contain thermodynamic data for gas and surface species obtained from ab initio calculations. Sur-faceThermoPt111 has the data for surface species on Pt, and the other three libraries have data for the gas-phase species. Species thermochemistry and reaction rates not found in these libraries are estimated by RMG. The model generation was started with 34 species, identified by Mazeau et al., in the core, as shown in the RMG input file in supplementary materials. Four surface batch reactors were added to verify the model for input ratios C/O= 0.6 and C/O= 2.6, both at 600 K and 2000 K. The absolute and relative tolerances for the ODE solver in RMG were 1 ⇥ 10 18 and 1 ⇥ 10 12 , respectively. The catalyst surface site density was set as 2.483 ⇥ 10 9 mol/cm 2 , 24 and the remaining parameters can be found in the RMG input file in the supplementary material. Nine carbon binding energies evenly distributed from 5.5 eV to 7.5 eV and 9 oxygen binding energies from 3.25 eV to 5.25 eV were combined to define 81 hypothetical metal surfaces. A separate RMG model was constructed for each hypothetical metal surface, and these individual models were then combined into a base model that includes all possible species and pathways that can occur significantly on any of the 81 hypothetical metals.