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Effect of high-temperature treatment on the properties of an alumina-chromium catalyst for the dehydrogenation of lower paraffins

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Abstract

The crystal and pore structures of a microspherical alumina-chromium catalyst calcined at 800–1100°C were studied using a set of currently available physicochemical techniques (X-ray diffraction, lowtemperature nitrogen adsorption, diffuse reflectance UV-vis spectroscopy, Raman spectroscopy, and EPR spectroscopy); the state of its active component and the catalytic properties in isobutane dehydrogenation were examined. As the calcination temperature was increased from 800 to 900–1000°C, the properties of the catalyst were improved as a result of the formation of Cr2O3 clusters in an optimum amount and a decrease in the surface acidity of the catalyst due to the dehydroxylation and phase transformations of the aluminum oxide support. Calcination at 1100°C was accompanied by a decrease in the yield of isobutylene as a result of the formation of inactive macrocrystalline chromium (III) oxide and a chromium species inaccessible to reacting molecules; this chromium species was encapsulated in closed pores as the constituent of a solid solution of α-Al2O3-Cr2O3.

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Authors and Affiliations

  1. Kazan (Volga Region) Federal University, Kazan, Tatarstan, Russia

    S. R. Egorova, G. E. Bekmukhamedov & A. A. Lamberov

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  1. S. R. Egorova
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  2. G. E. Bekmukhamedov
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  3. A. A. Lamberov
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Correspondence to S. R. Egorova.

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Original Russian Text © S.R. Egorova, G.E. Bekmukhamedov, A.A. Lamberov, 2013, published in Kinetika i Kataliz, 2013, Vol. 54, No. 1, pp. 51–60.

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Egorova, S.R., Bekmukhamedov, G.E. & Lamberov, A.A. Effect of high-temperature treatment on the properties of an alumina-chromium catalyst for the dehydrogenation of lower paraffins. Kinet Catal 54, 49–58 (2013). https://doi.org/10.1134/S0023158413010072

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