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Gas-phase Oxidation of Alcohols with O2 and N2O Catalyzed by Au/TiO2: A Comparative Study

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Abstract

Gas-phase oxidation of alcohols (EtOH, PrOH, i-PrOH, BuOH) to their carbonyl derivatives was used as test reaction to elucidate the mechanism of a low-temperature catalytic activity of Au/TiO2. The reactions were carried out in the presence of molecular oxygen, nitrous oxide as well as in the absence of the gas-phase oxidants. The relative contribution of oxidative and non-oxidative dehydrogenation pathways was thus estimated. The presence of oxygen in the feed brought about to a double peak profile of catalytic activity as a function of temperature for all the alcohols. The low-temperature peak fells on 120–130 °C. In contrast, the use of N2O as an oxidant gave rise to usual profile of catalytic activity, which is similar to that of anaerobic dehydrogenation of alcohols. The results obtained allowed to suggest the mechanism of the alcohols oxidation. The low temperature peak is probably related to participation of active oxygen species, generated from O2 on the catalyst surface. Oxidation with N2O is interpreted by preliminary dehydrogenation of alcohols to corresponding carbonyl derivatives followed by H2 oxidation.

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Acknowledgments

The authors thank Dr. O.A. Simakova for supplying and characterizing sample of the examined catalyst.

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Authors and Affiliations

  1. Boreskov Institute of Catalysis, Russian Academy of Science, Pr. Akademika Lavrentieva, 5, Novosibirsk, 630090, Russia

    Vladimir I. Sobolev & Konstantin Yu. Koltunov

  2. Tomsk State University, 36 Lenina Ave., Tomsk, 634050, Russia

    Vladimir I. Sobolev

  3. Novosibirsk State University, Pirogova, 2, Novosibirsk, 630090, Russia

    Konstantin Yu. Koltunov

Authors
  1. Vladimir I. Sobolev
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  2. Konstantin Yu. Koltunov
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Correspondence to Vladimir I. Sobolev or Konstantin Yu. Koltunov.

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Sobolev, V.I., Koltunov, K.Y. Gas-phase Oxidation of Alcohols with O2 and N2O Catalyzed by Au/TiO2: A Comparative Study. Catal Lett 145, 583–588 (2015). https://doi.org/10.1007/s10562-014-1430-2

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  • DOI: https://doi.org/10.1007/s10562-014-1430-2

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