Gold nanoparticles supported onto amine-functionalized in-capillary monoliths meant for flow-through catalysis: A comparative study

Monoliths functionalized with ethylene diamine-derived ligands were synthetized within micro-sized channels as highly permeable catalytic supports for the immobilization of in-situ generated gold nanoparticles. The as-obtained hybrids, essentially differing on grafted amine-containing compared, notably regarding immobilized nanoparticles morphology and their dispersion at monolith pore surface. Further, such in-capillary hybrid monoliths successfully applied flow-through microreactors reduction nitroaromatic compounds. general synthetic route preparing these composite materials consisted in a three-step procedure involving (i) UV-induced polymerization N-acryloxysuccinimide glycol dimethacrylate toluene, (ii) surface grafting series diamine derivatives through nucleophilic substitution N-hydroxysuccinimide leaving groups, (iii) successive situ tetrachloroauric acid to generate monolith-adsorbed successful synthesis was ascertained by Raman spectroscopy, EDX analysis SEM observations. Microscopy demonstrated key role amine-bearing ligand morphology, size coverage Monolith-adsorbed exhibited good activities towards conversion compounds into corresponding amino process. This study clearly demonstrates nature, primary vs. secondary, chelating amine (shape, size, dispersion) supported