Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/19634
Title: | Cobalt aluminate nanoparticles supported on MIL-101 structure: catalytic performance investigation |
Author: | Granadeiro, Carlos M. Karmaoui, Mohamed Correia, Eva Juliao, Diana Amaral, Vitor S. Silva, Nuno J. O. Cunha-Silva, Luis Balula, Salete S. |
Keywords: | METAL-ORGANIC FRAMEWORKS HETEROGENEOUS CATALYSTS SELECTIVE OXIDATION STYRENE EPOXIDATION COMPLEXES OXIDE GOLD TEMPERATURE FABRICATION |
Issue Date: | 2015 |
Publisher: | ROYAL SOC CHEMISTRY |
Abstract: | The first catalytic active composites based on CoAl2O4 nanoparticles with different size (5.5 and 2.5 nm) were successfully prepared using a simple methodology of incorporation into MIL-101(Cr) framework, CoAl-x@MIL(Cr). Characterization of CoAl-x@MIL(Cr) composites by elemental analysis, vibrational spectroscopy (FT-IR and FT-Raman), powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDX) confirmed the successful preparation and stability of the support structure after nanoparticle immobilization. A remarkable catalytic performance was found for thioanisole oxidation under sustainable conditions (95% of conversion after 30 min of reaction) and the catalytic application of the most active composite was extended to styrene oxidation. Higher catalytic performance was achieved for the composite prepared with larger CoAl2O4 nanoparticles. The recyclability and the stability of composites after catalytic use were investigated. For the CoAl-x@MIL(Cr) catalytic systems, the loading parameter instead of the nanoparticle size seemed to have a pronounced influence in the heterogeneous catalytic performance. The confinement effect promoted by MIL-101(Cr) cavities associated to the higher number of catalytic active centers (CoAl2O4) is clearly more important than the size of the catalytic nanoparticles used. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19634 |
DOI: | 10.1039/c4ra10498f |
ISSN: | 2046-2069 |
Publisher Version: | 10.1039/c4ra10498f |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Cobalt aluminate nanoparticles supported on MIL-101 structure catalytic performance investigation_10.1039c4ra10498f.pdf | 1.54 MB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.