Highly efficient epoxidation of α-pinene with O 2 photocatalyzed by dioxoMo (VI) complex anchored on TiO 2 nanotubes
| Autor: | Edgar A. Páez-Mozo, O Fernando Martínez, Henry Martínez, Álvaro A. Amaya |
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| Rok vydání: | 2018 |
| Předmět: |
Pinene
Geminal Silylation Epoxide 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Mechanics of Materials Covalent bond Polymer chemistry Photocatalysis General Materials Science 0210 nano-technology Photoacoustic spectroscopy |
| Zdroj: | Microporous and Mesoporous Materials. 265:202-210 |
| ISSN: | 1387-1811 |
| Popis: | The effect of different surface OH's groups on the amount of anchored Mo complex: Mo(VI)Cl2O2Bipy (Bipy = 4,4′-dicaboxylato-2,2′-bipyridine) grafted on TiO2 (Mo(VI)Cl2O2Bipy/TiO2) and its effect on the photocatalytic Oxygen Atom Transfer (OAT) activity to α-pinene with O2 was studied. The amount of supported complex on TiO2 nanotubes is 5 times the amount of the grafted complex on TiO2 P-25 and OAT activity increase of 25%, may be associated to the physicochemical properties of TiO2 nanotubes. High selectivity was preserved toward the epoxide formation (>90%). The amount of Mo complex covalently anchored on TiO2 depends on the concentration, distribution and accessibility of the Ti-OH surface groups, which depend on the TiO2 preparation method. The different OH's groups, namely: Bridged, geminal and isolated were identified by FT-IR Photoacoustic Spectroscopy. Surface OH's concentration was determined by TGA methods, silylation reactions and XPS analysis. |
| Databáze: | OpenAIRE |
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