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2013•Chinese Journal of Applied ChemistryRequires access

Cr_2O_3/ γ-Al_2O_3 Catalyzed Oxidation of Tetralin Toward α-Tetralone

XU Li-xi

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Abstract

Cr2O3/ γ-Al2O3catalysts were prepared through the wetness impregnation method and characterized by XRD,UV-Vis DRS and TG-DTA.The effects of Cr loadings,catalyst calcination temperature,oxidation reaction temperature and the catalyst quantity on the catalytic oxidation of tetralin to α-tetralone were investigated.The results demonstrate that the dominant active specie of the catalysts is Cr2O3with a small amount of CrO3highly dispersed on the surface of γ-Al2O3.A conversion of 50.1% of tetralin and a selectivity of 79.7% of α-tetralone are obtained over the 7.5% Cr2O3/ γ-Al2O3catalyst at 120 ℃ after 8 h oxidation.The as-obtained catalysts exhibit a good stability.

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What this paper is about

Cr2O3/ γ-Al2O3catalysts were prepared through the wetness impregnation method and characterized by XRD,UV-Vis DRS and TG-DTA.The effects of Cr loadings,catalyst calcination temperature,oxidation reaction temperature and the catalyst quantity on the catalytic oxidation of tetralin to α-tetralone were investigated.The results demonstrate that the dominant active specie of the catalysts is Cr2O3with a small amount of CrO3highly dispersed on the surface of γ-Al2O3.A conversion of 50.1% of tetralin and a selectivity of 79.7% of α-tetralone are obtained over the 7.5% Cr2O3/ γ-Al2O3catalyst at 120 ℃ after 8 h oxidation.The as-obtained catalysts exhibit a good stability.

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Available abstract

Cr2O3/ γ-Al2O3catalysts were prepared through the wetness impregnation method and characterized by XRD,UV-Vis DRS and TG-DTA.The effects of Cr loadings,catalyst calcination temperature,oxidation reaction temperature and the catalyst quantity on the catalytic oxidation of tetralin to α-tetralone were investigated.The results demonstrate that the dominant active specie of the catalysts is Cr2O3with a small amount of CrO3highly dispersed on the surface of γ-Al2O3.A conversion of 50.1% of tetralin and a selectivity of 79.7% of α-tetralone are obtained over the 7.5% Cr2O3/ γ-Al2O3catalyst at 120 ℃ after 8 h oxidation.The as-obtained catalysts exhibit a good stability.

Key concepts: Tetralin, Chemistry, Catalysis, Tetralone, Calcination, Selectivity, Nuclear chemistry, Incipient wetness impregnation

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