Vanadyl Porphyrin: Efficient Spin Probe to Study the Alumina Surface of Supported Catalysts Full article
| Journal |
Applied Magnetic Resonance
ISSN: 0937-9347 , E-ISSN: 1613-7507 |
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| Output data | Year: 2024, Volume: 55, Pages: 1293–1306 Pages count : 14 DOI: 10.1007/s00723-024-01681-9 | ||||
| Tags | Alumina; Electron spin resonance spectroscopy; Probes; Surface treatment; Vanadium compounds | ||||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Science Foundation | 24-13-00208 |
Abstract:
The EPR method and vanadyl tetraphenylporphyrin complex (VOTPP) as a spin probe were employed to study the transformation of the γ-Al2O3 surface during temperature treatment. It has been shown that VOTPP complex is stable at least up to a temperature of 450 °C and PO2 ≲ 3 Pa. Four distinct forms of vanadyl complex were identified on the γ-Al2O3 surface, depending on the annealing temperature. The intensity ratio between these forms, exhibiting significantly different spin-Hamiltonian parameters, depend on the degree of surface hydration, which in turn determines the ratio between sites with different acidity on the γ-Al2O3 surface. It has been shown that VOTPP complex demonstrate reversible transitions between different adsorption forms on the alumina surface during dehydration/hydration cycles. The observed phenomenon can be explained by the coordination vanadyl spin probe along the axial axis to the surface centers of different polarity/acidity.
Cite:
Chetkova A.G.
, Trukhan S.N.
, Martyanov O.N.
Vanadyl Porphyrin: Efficient Spin Probe to Study the Alumina Surface of Supported Catalysts
Applied Magnetic Resonance. 2024. V.55. P.1293–1306. DOI: 10.1007/s00723-024-01681-9 WOS Scopus РИНЦ AN OpenAlex
Vanadyl Porphyrin: Efficient Spin Probe to Study the Alumina Surface of Supported Catalysts
Applied Magnetic Resonance. 2024. V.55. P.1293–1306. DOI: 10.1007/s00723-024-01681-9 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | May 23, 2024 |
| Accepted: | Jul 9, 2024 |
| Published online: | Jul 16, 2024 |
| Published print: | Oct 1, 2024 |
Identifiers:
| Web of science: | WOS:001269229700001 |
| Scopus: | 2-s2.0-85198737219 |
| Elibrary: | 68998868 |
| Chemical Abstracts: | 2024:1593460 |
| OpenAlex: | W4400683662 |