Abstract
Pd/Al2O3 and Pd/SiO2 catalysts containing Pd nanoparticles in the size range of 3–13nm were prepared and investigated in direct selective hydrogenation of phenol to cyclohexanone. Catalysts with 3nm Pd nanoparticles present highly active and promoted the selective formation of cyclohexanone under atmospheric pressure of hydrogen in aqueous media without additives. Conversion of 99% and a selectivity higher than 99% were achieved within 3h at 333K. The generality of Pd/Al2O3 catalyst with 3nm Pd nanoparticles for this reaction was demonstrated by selective hydrogenation of other hydroxylated aromatic compounds with similar performance.
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