Vanadyl Porphyrin: Efficient Spin Probe to Study the Alumina Surface of Supported Catalysts | Sciact - CRIS-system of Boreskov Institute of Catalysis

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

Output data

Year: 2024, Volume: 55, Pages: 1293–1306 Pages count : 14 DOI: 10.1007/s00723-024-01681-9

Funding (1)

Russian Science Foundation

24-13-00208

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.

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

Submitted:	May 23, 2024
Accepted:	Jul 9, 2024
Published online:	Jul 16, 2024
Published print:	Oct 1, 2024

Web of science:	WOS:001269229700001
Scopus:	2-s2.0-85198737219
Elibrary:	68998868
Chemical Abstracts:	2024:1593460
OpenAlex:	W4400683662

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