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Selective and Efficient Olefin Epoxidation by Robust Magnetic Mo Nanocatalysts
Selective and Efficient Olefin Epoxidation by Robust Magnetic Mo Nanocatalysts
- Source :
- Catalysts, Vol 11, Iss 380, p 380 (2021), Catalysts, Volume 11, Issue 3
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- Iron oxide magnetic nanoparticles were synthesized with different sizes (11 and 30 nm). Subsequently they were shelled with a silica layer allowing grafting of an organic phosphine ligand that coordinated to the [MoI2(CO)3] organometallic core. The silica layer was prepared by the Stöber method using either mechanical (both 11 and 30 nm nanoparticles) or ultrasound (30 nm only) stirring. The latter nanoparticles once coated with silica were obtained with less aggregation, which was beneficial for the final material holding the organometallic moiety. The Mo loadings were found to be 0.20, 0.18, and 0.34 mmolMo·g−1 for MNP30-Si-phos-Mo,MNP11-Si-phos-Mo, and MNP30-Sius-phos-Mo, respectively, with the ligand-to-metal ratio reaching 4.6, 4.8, and 3.2, by the same order, confirming coordination of the Mo moieties to two phos ligands. Structural characterization obtained from powder X-ray diffraction (XRD), scanning electron microscopy (SEM)/ transmission electron microscopy (TEM) analysis, and Fourier-transform infrared (FTIR) spectroscopy data confirmed the successful synthesis of all nanomaterials. Olefin epoxidation of several substrates catalyzed by these organometallic nano-hybrid materials using tert-butyl hydroperoxide (tbhp) as oxidant, achieved very good results. Extensive testing of the catalysts showed that they are highly active, selective, recyclable, and efficient concerning oxidant consumption.
- Subjects :
- magnetic nanoparticles
Materials science
Scanning electron microscope
Nanoparticle
02 engineering and technology
lcsh:Chemical technology
010402 general chemistry
01 natural sciences
Catalysis
Nanomaterials
lcsh:Chemistry
molybdenum
recyclability
epoxidation
lcsh:TP1-1185
Physical and Theoretical Chemistry
Fourier transform infrared spectroscopy
Olefin fiber
021001 nanoscience & nanotechnology
Nanomaterial-based catalyst
0104 chemical sciences
core-shell
lcsh:QD1-999
Magnetic nanoparticles
0210 nano-technology
Nuclear chemistry
Subjects
Details
- ISSN :
- 20734344
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- Catalysts
- Accession number :
- edsair.doi.dedup.....b4334a0baf25b4fdb75d183742e5b5f4
- Full Text :
- https://doi.org/10.3390/catal11030380