Novel nano-semiconductor film layer supported nano-Pd Complex Nanostructured Catalyst Pd/Ⓕ-MeOx/AC for High Efficient Selective Hydrogenation of Phenol to Cyclohexanone
Supported metal as a type of heterogeneous catalysts are the most widely used in industrial processes. High dispersion of the metal particles of supported catalyst is a key factor in determining the performance of such catalysts. Here we report a novel catalyst Pd/Ⓕ-MeOx/AC with complex nanostructured, Pd nanoparticles supported on the platelike nano-semiconductor film/activated carbon, prepared by the photocatalytic reduction method, which exhibited high efficient catalytic performance for selective hydrogenation of phenol to cyclohexanone. Conversion of phenol achieved up to more than 99% with a lower mole ratio (0.5%) of active components Pd and phenol within 2 h at 70 °C. The synergistic effect of metal nanoparticles and nano-semiconductors support layer and the greatly increasing of contact interface of nano-metal-semiconductors may be responsible for the high efficiency. This work provides a clear demonstration that complex nanostructured catalysts with nano-metal and nano-semiconductor film layer supported on high specific surface AC can yield enhanced catalytic activity and can afford promising approach for developing new supported catalyst.
Synergistic catalysis between nano-Ni and nano semiconductor CeO2 of Ni hybrid nanostructured catalysts for highly efficient selective hydrogenation
The existence of strong metal–support interaction between Ni and CeO2 supported on carrier can enhance the structural and electronic properties.
Hydrogenation behaviour over SiO2-supported lanthanide–palladium bimetallic catalysts with considerable hydrogen uptake
Novel lanthanide-containing catalysts prepared by the use of dissolution of lanthanide metals in liquid ammonia have been studied. The hydrogenation of propene was carried out at 193–263 K over SiO2-supported lanthanide–palladium bimetallic catalysts (Ln–Pd/SiO2; Ln = Eu and Yb) obtained when the dissolved lanthanide in liquid ammonia reacted with 5 wt. % Pd/SiO2. Ln–Pd/Sio2 showed remarkable synergetic effects between the lanthanide and palladium metal involving considerable hydrogen uptake during the hydrogenation of propene. The rapid hydrogen uptake by Ln–Pd/SiO2 occurred at the start of the reaction, followed by the hydrogenation of propene with a definite induction period. The catalyst contained reactive hydrogen species which were able to efficiently hydrogenate the adsorbed propene. The kinetic studies indicated that the hydrogenation predominantly proceeds through a reaction path using hydrogen taken up by the catalyst. The presence of adsorbed propene on the catalyst surface was important to induce a promoting effect towards hydrogen uptake with subsequent hydrogenation of propene.