Use of Water as a Solvent in Directing Hydrogenation Reactions of Aromatic Acids over Pd/carbon Nanofibre Catalysts

Abstract

By conducting the catalytic hydrogenation over water miscible Pd/carbon nanofibre catalysts, selective ring hydrogenation of aromatic acids can be performed in aqueous solution without the need to provide protection for the external acid function.

The Influence of Surface Structure of RhPt Bimetallic Nanoparticles on the Hydrogenation of Aromatic Compounds

“…Catalytic hydrogenation is one of the most extensively investigated topics in academia and industry due to its wide application in the production of various valuable chemicals. − Among various hydrogenation reactions, selective hydrogenation of arenes/heteroarenes represents a significant challenge due to the high resonance stability of the aromatic rings. − Supported group VIII metal (e.g., Ni, Ru, Pt) − catalysts have been widely used for the hydrogenation of aromatic compounds. However, when the aromatic rings are substituted by highly polar and coordinative functionalities, more harsh reaction conditions are generally required because the catalysts may deactivate due to the poisoning effect arising from the strong adsorption of either the subtracts or products. − For example, Ru-based catalysts are known as the state-of-the-art catalysts for the hydrogenation of simple alkylarenes, while they normally show undesirable activity for the chemoselective hydrogenation of N-heterocyclic or carboxylic acid substituted compounds (e.g., quinoline, benzoic acid) and the reactions have to be operated at severe conditions. ,, In this respect, it is highly desirable to develop more efficient catalysts to catalyze the hydrogenation of the aromatic compounds with strong adsorption ability under mild conditions.…”

Acquiring Clean and Highly Dispersed Nickel Particles (ca. 2.8 nm) by Growing Nickel-Based Nanosheets on Al2O3 as Efficient and Stable Catalysts for Harvesting Cyclohexane Carboxylic Acid from the Hydrogenation of Benzoic Acid

“…7−9 However, the application of this promising synthesis was suspended by the absence of proper hydrogenation catalysts for the reaction. 10,11 Some precious metal catalysts, such as Pd/C, 12 Pd/CN, 13,14 Pd/MCN, 15 Ir/γ-Al 2 O 3 , 16 Ru/MC, 17 Rh/CN, 18 Rh/TiO 2 , 19 Pt nanowire, 20 and RuPd/CN 21 have been widely studied for the chemical transformation. However, the high cost of these catalysts excludes their industrial potentials.…”

Catalytic Hydrogenation of Arenes in Water Over In Situ Generated Ruthenium Nanoparticles Immobilized on Carbon

“…Therefore, severale fficient catalysts based on monometallic Pd, Pt, Rh, and Ru and several alloys have been explored for the aromatic ring hydrogenationo fb enzoic acid and its derivatives. [19][20][21][22][23][24][25][26][27][28][29][30][31] However, most of the catalytic reactions were performed under ah igh pressure of H 2 ,w hich leads to safety concerns. Ru catalysts are attractive because of their low cost and comparable activity to highly active Pd catalysts.…”

“…However, an environmentally friendly and efficient (recyclable catalyst) catalytic hydrogenation process has advantages over a stoichiometric hydrogenation reaction. Therefore, several efficient catalysts based on monometallic Pd, Pt, Rh, and Ru and several alloys have been explored for the aromatic ring hydrogenation of benzoic acid and its derivatives . However, most of the catalytic reactions were performed under a high pressure of H 2 , which leads to safety concerns.…”

“…Ru catalysts are attractive because of their low cost and comparable activity to highly active Pd catalysts . Interestingly, most of the active catalysts are supported on carbonaceous materials . Notably, recent findings implied that stabilisers, such as surfactants or ligands, control the catalytic properties of metal nanoparticles significantly .…”