A Water-Promoted Mars-van Krevelen Reaction Dominates Low-Temperature CO Oxidation over Au-FeO but Not over Au-TiO.

We provide experimental evidence that is inconsistent with often proposed Langmuir-Hinshelwood (LH) mechanistic hypotheses for water-promoted CO oxidation over Au-FeO. Passing CO and HO, but no O, over Au-γ-FeO at 25 °C, we observe significant CO production, inconsistent with LH mechanistic hypotheses. Experiments with HO further show that previous LH mechanistic proposals cannot account for water-promoted CO oxidation over Au-γ-FeO.

Multi-spectroscopic study of electrochemically-formed oxide-derived gold electrodes.

Oxide-derived metals are produced by reducing an oxide precursor. These materials, including gold, have shown improved catalytic performance over many native metals. The origin of this improvement for gold is not yet understood.