Bader charge analysis was performed to obtain the partial atomic charges. C-H activation barriers for low-lying and important binding modes were calculated using the climbing-image nudged elastic band (CI-NEB) method and optimized until the force on all of the images was less than 0.02 eV/Å. For ethylene and acetylene, multiple non-equivalent C-H bond breaking events were attempted, focusing on the hydrogens closest to Pt atoms. For ethane, only the elongated activated C-H bonds were broken.