For C2H6, the presence of a proton slightly increased the highest activation energy barrier by only 11 kJ/mol (Table and Fig. ). This slight increase indicates that protons have little impact 10 on C2H6 diffusion. In contrast, the stabilizing interaction between C2H4 and the proton significantly reduced the diffusion barrier of C2H4, enhancing C2H4 movement through the window (Fig. , top).