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...

Full description

Saved in:
Bibliographic Details
Published in:Topics in catalysis 2023-09, Vol.66 (15-16), p.1161-1170
Main Authors: Guerrero-Pérez, M. Olga, Lapina, Olga B., Rasmussen, Søren B., Bañares, Miguel A.
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Crystallites
Industrial Chemistry/Chemical Engineering
NMR
Nuclear magnetic resonance
Optimization
Original Article
Oxidation
Pharmacy
Physical Chemistry
Valence
Vanadium oxides
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 V 4+ 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.
ISSN:1022-5528
1572-9028
DOI:10.1007/s11244-023-01827-2