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- W2024441443 abstract "The interaction of oxygen with rhenium crystallites supported on γ-alumina over a wide temperature range, 20–800°C has been studied. Hydrogen chemisorption, oxygen uptake, and HRTEM, SAED, and XRD methods were applied to monitor morphology changes created upon heat treatment in H2 and O2. The structure of the surface rhenium oxide species was determined by HRTEM, Raman spectroscopy, and leaching with the cold water. The results obtained allowed us to propose a detailed mechanism of the oxidation and redispersion of Re crystallites on alumina. At 20–150°C dissociative chemisorption of oxygen occurs with the possible formation of a superficial Re oxide. At 200–300°C the process of oxidation of Re accelerates, with instantaneous sublimation of Re2O7 and its simultaneous adsorption as the ReO4 species on γ-alumina. Metallic Re is still observed in this temperature range. At 400–600°C, the ReO4 species on the support form two kinds of a surface compound exhibiting Al–O–ReO3 and Al–(O–ReO3)3 structures. At 800°C the surface aluminium perrhenate decomposes and a part of the Re oxide sublimes as Re2O7. The redispersion of rhenium was observed after H2 treatment of the oxidized rhenium catalyst." @default.
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- W2024441443 date "1999-11-01" @default.
- W2024441443 modified "2023-10-18" @default.
- W2024441443 title "Oxidation and Redispersion of a Re/γ-Al2O3 Catalyst" @default.
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- W2024441443 doi "https://doi.org/10.1006/jcat.1999.2634" @default.
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