2026-05-29T23:41:28Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/303632026-02-03T11:17:41Zcom_10630_2254col_10630_37953

Combined Operando XANES and NMR and ESR Spectroscopies for the Determination of VPO Dynamic States. Guerrero-Pérez, María Olga Lapina, Olga B. Rasmussen, Soren B. Bañares, Miguel Ángel Catalizadores de vanadio Espectroscopía 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. 2024-02-12T10:13:37Z 2024-02-12T10:13:37Z 2024 2023-05-29 journal article Guerrero-Pérez, M.O., Lapina, O.B., Rasmussen, S.B. et al. Combined Operando XANES and NMR and ESR Spectroscopies for the Determination of VPO Dynamic States. Top Catal 66, 1161–1170 (2023). https://doi.org/10.1007/s11244-023-01827-2 https://hdl.handle.net/10630/30363 10.1007/s11244-023-01827-2 eng http://creativecommons.org/licenses/by/4.0/ open access Attribution 4.0 Internacional Springer