Реферат: 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.

Библиографическая ссылка: 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 CAPlus OpenAlex

Даты:

Поступила в редакцию:	23 мая 2024 г.
Принята к публикации:	9 июл. 2024 г.
Опубликована online:	16 июл. 2024 г.
Опубликована в печати:	1 окт. 2024 г.

Идентификаторы БД:

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

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