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Solvent-free oxidation of benzyl alcohol using titania-supported gold–palladium catalysts: Effect of Au–Pd ratio on catalytic performance
Authors:Dan I Enache  Dean Barker  Jennifer K Edwards  Stuart H Taylor  David W Knight  Albert F Carley  Graham J Hutchings  
Affiliation:

aSchool of Chemistry, Cardiff University, Main College, Park Place, Cardiff CF10 3AT, UK

Abstract:The oxidation of benzyl alcohol with molecular oxygen under solvent-free conditions has been investigated using a range of titania-supported Au–Pd alloy catalysts to examine the effect of the Au–Pd ratio on the conversion and selectivity. The catalysts have been compared at high reaction temperature (160 °C) as well as at 100 °C, to determine the effect on selectivity since at lower reaction temperature the range of by-products that are formed are limited. Under these conditions the 2.5 wt.% Au–2.5 wt.% Pd/TiO2 was found to be the most active catalyst, whereas the Au/TiO2 catalyst demonstrated the highest selectivity to benzaldehyde. Toluene, formed via either a hydrogen transfer process or an oxygen transfer process, was observed as a major by-product under these forcing conditions.
Keywords:Benzyl alcohol oxidation  Gold  Palladium  Titania
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