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Activity of calcined Ag,Cu,Au/TiO2 catalysts in the dehydrogenation/dehydration of ethanol

  • Chemical Kinetics and Catalysis
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Abstract

The catalytic activity of the anatase TiO2 and Mz+/TiO2 with supported ions Mz+ = Ag+, Cu2+, Au3+ in vapor phase conversions of ethanol is investigated at temperatures of 100–400°C. It is shown that the yields of acetaldehyde and ethylene decline for the most active catalyst Cu2+/TiO2 but increase for TiO2 and Ag/TiO2. The drop in the activation energy of the dehydrogenation reaction over calcined samples is linearly correlated with the one in the reduction potential of Mz+ to Cu+, Au+, Ag0 and the ionic radius of Mz+ in the crystal. The energies of activation for ethylene formation change in the series TiO2 > Au3+ > Cu2+ >Ag+ and TiO2 ≈ Cu2+ ≈ Ag+ > Au3+ for the calcined samples. The rate of pyridine adsorption, considered as an indicator of the activity of acid sites, is a linear function of ion charge +z = 1, 2, 3, and slows by two-thirds after calcination.

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Authors and Affiliations

  1. Peoples’ Friendship University of Russia, Moscow, 117198, Russia

    Do Tkhyui Mai, A. I. Pylinina & I. I. Mikhailenko

Authors
  1. Do Tkhyui Mai
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  2. A. I. Pylinina
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  3. I. I. Mikhailenko
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Correspondence to I. I. Mikhailenko.

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Original Russian Text © Do Tkhyui Mai, A.I. Pylinina, I.I. Mikhailenko, 2015, published in Zhurnal Fizicheskoi Khimii, 2015, Vol. 89, No. 7, pp. 1101–1105.

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Mai, D.T., Pylinina, A.I. & Mikhailenko, I.I. Activity of calcined Ag,Cu,Au/TiO2 catalysts in the dehydrogenation/dehydration of ethanol. Russ. J. Phys. Chem. 89, 1184–1188 (2015). https://doi.org/10.1134/S0036024415070092

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  • DOI: https://doi.org/10.1134/S0036024415070092

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