Palladium-nanoparticles on end-functionalized poly(lactic acid)-based stereocomplexes for the chemoselective cinnamaldehyde hydrogenation: Effect of the end-group
Title | Palladium-nanoparticles on end-functionalized poly(lactic acid)-based stereocomplexes for the chemoselective cinnamaldehyde hydrogenation: Effect of the end-group |
Publication Type | Journal Article |
Year of Publication | 2015 |
Authors | Oberhauser, W, Evangelisti, C, Jumde, RP, Petrucci, G, Bartoli, M, Frediani, M, Mannini, M, Capozzoli, L, Passaglia, E, Rosi, L |
Journal | Journal of Catalysis |
Volume | 330 |
Pagination | 187 - 196 |
Date Published | 2015 |
ISBN Number | 00219517 (ISSN) |
Keywords | Carboxylic Acids, Cinnamaldehyde, Cinnamaldehyde hydrogenation, Complexation, Dispersions, Heterogenous catalysts, Hydrogenation, Lactic acid, Metal Nanoparticles, Metal vapor synthesis, Nanoparticles, Palladium, Palladium nanoparticles, PD nano particle, Pd-nanoparticles, Poly lactic acid, Poly(lactic acid), Polymers, Stereocomplex, Stereocomplexes, Synthesis (chemical) |
Abstract | Differently carboxylic acid end-functionalized poly(lactic acid) (PLA)-based stereocomplexes were used as polymer support to stabilize Pd-nanoparticles (NPs) generated by the metal vapor synthesis technique. The dispersion of Pd was strongly dependent on the end-group present in the polymer structure, as shown by HRTEM measurements. 2,2′-Bipyridine- and pyridine-based stereocomplexes showed high metal dispersion (i.e. well-separated Pd-NP size of 2.0 ± 0.6 nm), whereas stereocomplexes bearing benzyl and carboxylic acid end groups exhibited strong Pd-NPs aggregation. The heterogenous catalysts were employed to chemoselectively hydrogenate the CC double bond in cinnamaldehyde, showing for Pd-NPs, stabilized by the 2,2′-bipyridine-modified polymer support, the best performance in terms of chemoselectivity (99%) and recyclability in THF solution. Even under bulk cinnamaldehyde hydrogenation conditions, chemoselectivity for 3-phenylpropanal of 90% at 88% conversion was obtained. © 2015 Elsevier Inc. All rights reserved. |
Short Title | J. Catal. |