Exclusive hydrogenation of benzaldehyde to benzyl alcohol in gas phase continuous operation (393-413 K, 1 atm) was achieved over Au/Al 2O3, Au/TiO2 and Au/ZrO2. Synthesis of Au/Al2O3 by deposition-precipitation generated a narrower distribution (2-8 nm) of smaller (mean = 4.3 nm) Au particles relative to impregnation (1-21 nm, mean = 7.9 nm) 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.
- Benzyl alcohol
- Selective hydrogenation
- Water as carrier
ASJC Scopus subject areas
- Process Chemistry and Technology