Selectivity in the gas-phase hydrogenation of 4-nitrobenzaldehyde over supported Au catalysts - Sorbonne Université Access content directly
Journal Articles Journal of Catalysis Year : 2014

Selectivity in the gas-phase hydrogenation of 4-nitrobenzaldehyde over supported Au catalysts

Abstract

The effects of Au particle size and support properties have been examined in the gas-phase hydrogenation of 4-nitrobenzaldehyde over Au/ZrO2, Au/TiO2 and Au/Al2O3. Gold particle size was varied using deposition-precipitation and impregnation syntheses. The catalysts have been characterised in terms of BET area/pore volume, temperature-programmed reduction (TPR), XRD, H2 chemisorption/TPD, TEM, XPS, and pyridine adsorption FTIR measurements. Reaction exclusivity to 4-aminobenzaldehyde was achieved over Au/ZrO2 and Au/TiO2 where a decrease in Au particle size (mean from 7.0 to 4.7 nm) generated a higher turnover frequency. Pyridine adsorption coupled with FTIR analysis has revealed stronger Lewis acidity associated with Au/Al2O3, which contributes to Cdouble bond; length as m-dashO reduction via the formation of a benzoate intermediate. Selectivity to the alcohol is sensitive to Au size and reaction temperature with 100% 4-nitrobenzyl alcohol selectivity over Au/Al2O3 (mean Au size = 7.8 nm) at 423-443 K. Our results demonstrate the viability of controlling selective single bondNO2 and Cdouble bond; length as m-dashO reduction using oxide-supported Au catalysts.
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Dates and versions

hal-00982883 , version 1 (24-04-2014)

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Noémie Perret, Xiaodong Wang, Thomas Onfroy, Christophe Calers, Mark A Keane. Selectivity in the gas-phase hydrogenation of 4-nitrobenzaldehyde over supported Au catalysts. Journal of Catalysis, 2014, 309, pp.333-342. ⟨10.1016/j.jcat.2013.10.011⟩. ⟨hal-00982883⟩
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