Probing Molybdenum Active Sites during In Situ Photoreduction of the Mo6+/SiO2 Catalyst
| Autor: | Giuseppe Spoto, Rosangela Santalucia, Lorenzo Mino |
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| Rok vydání: | 2021 |
| Předmět: |
Reducing agent
Pharmaceutical Science chemistry.chemical_element Photochemistry Article Analytical Chemistry Catalysis lcsh:QD241-441 chemistry.chemical_compound Ultraviolet visible spectroscopy lcsh:Organic chemistry Oxidation state Drug Discovery Physical and Theoretical Chemistry Carbon monoxide Probe molecules In situ spectroscopy Molybdena-silica catalysts Organic Chemistry UV-Vis spectroscopy FT-IR spectroscopy chemistry Polymerization Chemistry (miscellaneous) Molybdenum Molecular Medicine Hydrodesulfurization |
| Zdroj: | Molecules Volume 26 Issue 6 Molecules, Vol 26, Iss 1700, p 1700 (2021) |
| ISSN: | 1420-3049 |
| DOI: | 10.3390/molecules26061700 |
| Popis: | The photoreduction of the Mo6+/SiO2 system with CO was investigated in situ, employing a recently developed experimental setup allowing for the acquisition of transmission FT-IR spectra under simultaneous UV irradiation. Carbon monoxide, besides acting as a reducing agent in such processes, is also a useful probe molecule able to detect coordinatively unsaturated sites exposed on the surface. The unprecedented quality of the spectroscopic data, obtained as a function of the reduction time, allowed us to better rationalize the different mechanisms previously proposed for the photoreduction process. These results, coupled with UV-Vis spectroscopic data, shed light on the oxidation state and surface structure of supported molybdenum species, which are key active sites for several important reactions, such as selective oxidation, polymerization, hydrodesulfurization, epoxidation and olefin metathesis. |
| Databáze: | OpenAIRE |
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