Abstract
AbstractPalladium 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.
Highlights
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
Silica and carbon coated cobalt nanoparticles with amine functionalization in their outer shell (Co/C-SiO2-NH2) 3 were prepared from unfunctionalized Co/C nanobeads[24] 1: Briefly, silica coating with tetraethyl orthosilicate (TEOS)[25] led to 2, followed by amine functionalization using 3-aminopropyltriethoxysilane (APTES) yielding 3 with a high amine loading of
Time required for full conversion was determined by GC analysis using dodecane as an internal standard, [c] TOF values are calculated as mmol substrate per mmol palladium per time, [d] As in [a] without internal standard
Summary
Magnetic Carbon-Coated Cobalt Nanoparticles for Sustainable Hydrogenation of Nitroarenes, Alkenes and Alkynes. Nano crystallization of heterogeneous catalysts has been hailed as a bridge between heterogeneous and homogeneous catalysis, but the recovery of such nanocatalysts is troublesome because of their small particle size, augmenting their leaching of active component into the product To resolve this problem nanoparticles supported on a magnetic core have emerged with the promise of facile recovery with the aid of an external magnet.[12]. Nanoparticle (NP) based heterogeneous catalysis[1] offers supported metal as active sites which can be retrieved from the reaction mixture by filtration, improving on the above stated limitations They are attractive for catalysis because of their large surface area-to-volume ratio and the possibility to modulate their size and the catalytic potential of such materials can be tuned.[2] the high surface energy of NPs usually causes extensive aggregation,[3] which often prohibits a tailoring of the particle size.
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