Modification by SiO2 of Alumina Support for Light Alkane Dehydrogenation Catalysts

  • Bekmukhamedov G
  • Mukhamed’yarova A
  • Egorova S
  • et al.
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Abstract

© 2016 by the authors; licensee MDPI, Basel, Switzerland. Due to the continuously rising demand for C 3 –C 5 olefins it is important to improve the performance of catalysts for dehydrogenation of light alkanes. In this work the effect of modification by SiO 2 on the properties of the alumina support and the chromia-alumina catalyst was studied. SiO 2 was introduced by impregnation of the support with a silica sol. To characterize the supports and the catalysts the following techniques were used: low-temperature nitrogen adsorption; IR-spectroscopy; magic angle spinning 29 Si nuclear magnetic resonance; temperature programmed desorption and reduction; UV-Vis-, Raman-and electron paramagnetic resonance (EPR)-spectroscopy. It was shown that the modifier in amounts of 2.5–7.5 wt % distributed on the support surface in the form of SiO x -islands diminishes the interaction between the alumina support and the chromate ions (precursor of the active component). As a result, polychromates are the compounds predominantly stabilized on the surface of the modified support; under thermal activation of the catalyst and are reduced to the amorphous Cr 2 O 3 . This in turn leads to an increase in the activity of the catalyst in the dehydrogenation of isobutane.

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Bekmukhamedov, G., Mukhamed’yarova, A., Egorova, S., & Lamberov, A. (2016). Modification by SiO2 of Alumina Support for Light Alkane Dehydrogenation Catalysts. Catalysts, 6(10), 162. https://doi.org/10.3390/catal6100162

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