Fig. 7: Calculated rate constants (k_r,1) and k_r,2) for the surface reaction between adsorbed oxygen and CO from the three-pathway kinetic model with the error bars representing the 95% confidence intervals for the fitted variables.

a, b Isothermal titration experiments where CO was adsorbed at 100 and 200 °C. Increasing total CO₂ produced is correlated with decreasing CO coverage. c, d TPO experiments where CO was adsorbed at temperature ranging from 25–200 °C. When the production of CO₂ is sufficiently low in the TPO experiment ( > 200 °C) the signal/noise ratio of the CO₂ exit flux curves significantly decreases, and the oxidation state of Pt is uncertain (see Supplementary VI), which in turn decreases the confidence in the model fitting, particularly for pathway 2, as shown in Supplementary Fig. 12.