Abstract
Exclusive hydrogenation of benzaldehyde to benzyl alcohol in gas phase continuous operation (393–413K, 1atm) was achieved over Au/Al2O3, Au/TiO2 and Au/ZrO2. Synthesis of Au/Al2O3 by deposition–precipitation generated a narrower distribution (2–8nm) of smaller (mean=4.3nm) Au particles relative to impregnation (1–21nm, mean=7.9nm) with increased H2 uptake under reaction conditions and higher benzaldehyde turnover. Switching reactant carrier from ethanol to water resulted in a significant enhancement of selective hydrogenation rate over Au/Al2O3 with 100% benzyl alcohol yield, attributed to increased available reactive hydrogen. This response extends to reaction over Au/TiO2 and Au/ZrO2.
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