Selective partial hydrogenation of hydroxy aromatic derivatives with palladium nanoparticles supported on hydrophilic carbon

Abstract

Selective hydrogenation of phenol to cyclohexanol in the aqueous phase was achieved using a new catalytic system based on palladium particles supported on hydrophilic carbon prepared by one-pot hydrothermal carbonisation.

Hydrogenation of phenol with supported Rh catalysts in the presence of compressed CO2: Its effects on reaction rate, product selectivity and catalyst life

“…On the basis of these results, it can be concluded that the phenol hydrogenation proceeds through the pathways illustrated in Scheme 1: phenol is sequentially hydrogenated through cyclohexanone to cyclohexanol (paths i and iii) and directly to cyclohexanol (path ii). In contrast to the present results, almost 100% selectivity to cyclohexanone was obtained with supported Pd catalysts in both the gas-phase [1][2][3][4][5][6][7][8][9][10][11][12] and liquid-phase [13][14][15][16]25] hydrogenation reactions. The direct formation of cyclohexanol from phenol (path ii) is unlikely to occur with these Pd catalysts.…”

“…In the cases of vapor phase hydrogenation, high temperatures are needed, which usually cause catalyst deactivation by coking during the reaction. In a few studies, liquid phase hydrogenation of phenol was carried out with Pd catalysts [13][14][15][16]. However, high reaction temperatures or long reaction time were still required to obtain high phenol conversions.…”

A Review of Hydrothermal Carbonization of Carbohydrates for Carbon Spheres Preparation

“…Carbon spheres embedded with palladium nanoparticles were synthesized by HTC of furfural and palladium acetylacetonate. During the HTC process, the palladium acetylacetonate was reduced to elemental metallic palladium nanoparticles [70].…”

Hydrogenation of Phenol over Pt/CNTs: The Effects of Pt Loading and Reaction Solvents

“…Matos et al [14] reported that the phenol hydrogenation produces cyclohexanone over a polar TiO 2 -C-supported Pd catalyst, while it produces cyclohexanol over a hydrophobic TiO 2 -C-supported catalyst. Makowski et al [15] reported that the hydrophilic carbon-supported Pd catalyst showed very high cyclohexanone selectivity in phenol hydrogenation. These results suggest that the hydrophilicity/hydrophobicity of CNTs could affect the catalytic properties of CNTs-supported metal catalysts for phenol hydrogenation.…”