2008

OxidationO 0212 Size-Dependent Catalytic Activity of Supported Palladium Nanoparticles for

Aerobic Oxidation of Alcohols. — Several silica-alumina-supported palladium nano-particles are prepared by adsorption of tetrachloropalladate ions onto the support fol-lowed by calcination and reduction with either hexanol or hydrogen.The mean size of the Pd particles ranges from 2.2 to 10 nm and depends on the Si/Al ratio. The supported Pd nanoparticles catalyze the aerobic oxidation of various alcohols to the correspond-ing aldehydes or ketones. They are particularly efficient for the solvent-free conversion of benzyl alcohol. The intrinsic turnover frequency per surface Pd atom for the oxida-tion of BnOH shows a maximum at a medium size of 3.6-4.3 nm, revealing that the reaction is structure-sensitive. — (CHEN, J.; ZHANG*, Q.; WANG, Y.; WAN, H.; Adv. Synth. Catal. 350 (2008) 3, 453-464; State Key Lab. Phys. Chem. Solid Surf., Dep. Chem., Xiamen Univ., Xiamen 361005, Fujian, Peop. Rep. China; Eng.) — Klein

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