Combined Operando XANES and NMR and ESR Spectroscopies for the Determination of VPO Dynamic States
Nanoscaled-VPO (vanadium phosphate oxide) catalysts have been prepared on an alumina support with the objective of obtaining crystallites of the active phase with a high surface-to-volume ratio. Since the catalysed reaction occurs at the surface, these nanoscaled catalysts allows studying surface sp...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/359822 |
| Acceso en línea: | http://hdl.handle.net/10261/359822 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85160451604&doi=10.1007%2fs11244-023-01827-2&partnerID=40&md5=72db13a3bbfa96eac41c1583d0c2b69f |
| Access Level: | acceso abierto |
| Palabra clave: | Nanoscaled VPO catalysts Operando XANES 51V 27Al 31P NMR ESR |
| Sumario: | Nanoscaled-VPO (vanadium phosphate oxide) catalysts have been prepared on an alumina support with the objective of obtaining crystallites of the active phase with a high surface-to-volume ratio. Since the catalysed reaction occurs at the surface, these nanoscaled catalysts allows studying surface species transformations with a minimized signal from the bulk dominion. The chemical environment and oxidation state of these species has been determined by a combination of NMR, ESR and XANES spectroscopies. The results have allowed to optimize V + P coverage and V/P molar ratio to minimize the concentration of isolated vanadium oxide species and maximize V4+ concentration. The distribution of phosphorus islands ordered and significantly distorted of tetra- and penta-coordinated aluminium sites of the catalytic support, thus shaping the catalytic material to an optimal structure for the desired partial oxidation reaction. © 2023, The Author(s). |
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