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The catalytic reaction of H2+O2 over a Au/TiO2 catalyst was studied by transmission IR spectroscopy and DFT calculations. A reaction path of O2‐assisted H2 dissociation at the Au/TiO2 dual perimeter site was found to proceed through a TiOOH intermediate (see scheme). The calculated barrier range (0.13–0.25 eV) for the sequence of low‐energy steps agree with the experimental Ea of 0.22 eV.
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