Palladium Nanocatalysts Encapsulated on Porous Silica @ Magnetic Carbon‐Coated Cobalt Nanoparticles for Sustainable Hydrogenation of Nitroarenes, Alkenes and Alkynes

• Published in: ChemCatChem Vol. 12; no. 2; pp. 569 - 575
• Main Authors: Purohit, Gunjan, Rawat, Diwan S., Reiser, Oliver
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 18.01.2020
• Subjects: Alkenes; Alkynes; Carbon; heterogeneous catalysis; Hydrogenation; immobilization; Leaching; Mapping; Nanoparticles; Nitrobenzene; Palladium; Pd nanoparticles; Silicon dioxide; X ray photoelectron spectroscopy
• ISSN: 1867-3880; 1867-3899
• DOI: 10.1002/cctc.201901371

Palladium nanoparticles were impregnated on porous silica shell carbon‐coated cobalt nanoparticles, resulting in a magnetically retrievable material that was evaluated in the catalytic hydrogenation of nitroarenes, alkenes and alkynes. The prepared material was characterized by HR‐XRD, HR‐TEM, elemental mapping EDX, ICP‐OES and XPS analyses, revealing highly dispersed palladium nanoparticles within the porous platform that could account for the high activity observed. Mild reaction conditions, easy retrievability of the catalyst with the aid of an external magnet, recycling in four runs with a total leaching of 19 ppm (1.2 % of the initially employed Pd amount), and high stability makes this material attractive for sustainable and environmentally benign applications. Sustainable hydrogenation: Pd NPs were successfully impregnated on amine functionalised silica shell coated Co/C thereby exhibiting high catalytic efficiency and chemoselectivity for molecular hydrogen mediated catalytic hydrogenation of nitroarenes, alkenes and alkynes.