The influence of the support (Al2O3, CeO2, TiO2) in oxidation benzyl alcohol (BA) to benzaldehyde on Ir-based catalysts was investigated by ATR-IR spectroscopy tandem with modulation excitation (ATR-IR-MES) at working conditions catalysts. ATR-IR-MES unveiled dissociative adsorption BA and formation adsorbed transient alkoxy species (C6H5CH2O) be key for high catalytic performance. These were d...