Supported Cobalt Oxide Nanoparticles: The Influence of Mesoporous Materials and their Role in Methyl Phenyl Sulfide Oxidation Reactions

The effect of the support in the incorporation of cobalt oxide nanoparticles on mesoporous materials (SBA‐15) and mesoporous cellular foam (MCF) was investigated. The materials were characterized using various techniques. The XRD diffraction patterns showed that the porous structures remained after...

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Bibliographic Details
Published in:ChemCatChem 2024-10, Vol.16 (19), p.n/a
Main Authors: Ortenzi, Georgina P., Leal‐Marchena, Candelaria, Gómez Costa, Marcos B., Laura Martínez, M.
Format: Article
Language:English
Subjects:
Amorphous materials
Catalytic properties
Cellular structure
Cobalt
Cobalt oxide nanoparticles
Cobalt oxides
Diffraction patterns
Electrons
Metal oxides
Nanoparticles
Nanostructures
Oxidation
Porous materials
SMSI
Surface properties
X ray photoelectron spectroscopy
X-ray diffraction
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Summary:The effect of the support in the incorporation of cobalt oxide nanoparticles on mesoporous materials (SBA‐15) and mesoporous cellular foam (MCF) was investigated. The materials were characterized using various techniques. The XRD diffraction patterns showed that the porous structures remained after cobalt incorporation, while high‐angle XRD of the MCF showed CoO peaks, in contrast to Co‐SBA‐15 which exhibited Co3O4. This was confirmed by XPS technique. The SEM‐EDS and HRTEM‐STEM microscopy indicate a distribution of cobalt oxides uniform in the samples synthesized and the average size of the particles is 1.88 nm. H2‐TPR analysis highlighted the interaction between the support surfaces and the metal oxide (SMSI). It was observed that in the SBA‐15 structure, small clusters of cobalt oxide formed with a strong interaction with silica, leading to high reduction temperatures. The catalysts activity was characterized in oxidation reactions of Methyl Phenyl Sulfide and a correlation was observed between the characterization results and the enhanced selectivity and yield towards sulfone exhibited by Co‐MCF. Mesostructured MCF and SBA‐15 materials with cobalt oxide nanoclusters were designed. The pore topology of each mesostructure favors a certain oxidation state of cobalt, with the mesoporous cellular foam showing higher Co2+/Co3+ ratios. The influence of each support on the support metal interaction (SMSI) was determined by different techniques. A higher amount of Co2+ is required in methylphenylsulfone oxidation reactions.
ISSN:1867-3880
1867-3899
DOI:10.1002/cctc.202400836