Palladium-loaded oxidized diamond catalysis for the selective oxidation of alcohols

Oxidation of alcohols (benzyl alcohol, 1-phenylethanol and cinnamyl alcohol) using oxidized diamond (O-Dia) supported Pd catalyst was studied. The O-Dia supported catalyst exhibited a high catalytic activity among the support materials of Pd-loaded catalysts in the oxidation of benzyl alcohol at 85 °C, showing TOFs of 850 h−1. The addition of small amount of CeO2 to O-Dia supports further improved catalytic activity in the oxidation of 1-phenylethanol with molecular oxygen. The promotion effect of CeO2 was the suppression of acidic properties of the Pd/O-Dia, leading to dehydration and hydrogenolysis reactions of 1-phenylethanol. In addition, the Pd/CeO2/O-Dia catalyst showed a higher catalytic activity in the oxidation of various alcohols than that of Pd/O-Dia. Moreover, the basic metal oxide-promoted catalysts exhibited high catalytic activity in the dehydrogenation of 1-phenylethanol without molecular oxygen at 120 °C.

Oxidized diamond, sp3 carbon, supported Pd catalyzed oxidation of primary and secondary alcohols to respective carbonyl compounds in high yield and selectivity, in the presence or even in the absence of O2.Figure optionsDownload high-quality image (233 K)Download as PowerPoint slide