Abstract
Gold nanoparticles deposited on MgO, CaO, SrO, and BaO by homogeneous deposition–precipitation using urea are, for the first time, reported to be novel highly active/selective and reusable catalysts in the epoxidation of styrene to styrene oxide (SO) by anhydrous t-butyl hydroperoxide. Au/MgO prepared by deposition–precipitation using NaOH is also studied in styrene epoxidation. The slightly poorer performance of Au/MgO prepared by deposition–precipitation in epoxidation of styrene (conversion: 44.6%, SO selectivity: 36.1%), as compared with to the gold catalysts prepared on alkaline earth oxides by homogeneous deposition–precipitation (styrene conversion: ⩾53%, SO selectivity: 45–60%), is attributed to the lower loading (4.1 wt%), larger particle size ( D Au = 17.9 nm), and possible presence of trace impurities (Na + and Cl −) in the former. Higher gold loading (4.7–7.5 wt%) and smaller gold particles ( D Au ≅ 8.0 nm) were observed in the alkaline earth-supported Au catalysts prepared by homogeneous deposition–precipitation.
Published Version
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