Cobalt aluminate nanoparticles supported on MIL-101 structure: catalytic performance investigation
authors Granadeiro, CM; Karmaoui, M; Correia, E; Juliao, D; Amaral, VS; Silva, NJO; Cunha-Silva, L; Balula, SS
nationality International
journal RSC ADVANCES
keywords METAL-ORGANIC FRAMEWORKS; HETEROGENEOUS CATALYSTS; SELECTIVE OXIDATION; STYRENE; EPOXIDATION; COMPLEXES; OXIDE; GOLD; TEMPERATURE; FABRICATION
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.
publisher ROYAL SOC CHEMISTRY
issn 2046-2069
year published 2015
volume 5
issue 6
beginning page 4175
ending page 4183
digital object identifier (doi) 10.1039/c4ra10498f
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000346570300031

Events
Sponsors

1suponsers_list_ciceco.jpg