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Reductive dehydration of ethanol to hydrocarbons on Ni- and Au-containing nanocomposites

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Abstract

Monometallic and bimetallic nanocomposites M/Al2O3 (M = NiO, Au, NiO + Au) with metal contents of 0.1–0.65 wt % were prepared by the deposition-precipitation and/or impregnation technique. The surface of the composites was investigated by transmission electron microscopy (TEM), EDX, adsorption spectroscopy (AAS), and XAFS. The features of the M/Al2O3 catalysis of the reductive dehydration of ethanol at 350°C were investigated. The activity of NiO/Al2O3 containing 3.5 nm particles of NiO was 130 h−1. A strong size effect in activity was revealed for Au/Al2O3 nanocomposites with activity increasing from 341 to 1384 h−1 as the size of gold particles decreased from 13–20 to 5 nm. The selectivity of 5-nm particles of Au/Al2O3 to the fraction of C3-C8 hydrocarbons was 11.69 mass %. The growth of M particles due to the segregation of individual metals and/or the formation of mixed (Au + NiO) particles resulted in an increase in the selectivity of C3-C8 up to 34.19 mass %. The causes of the observed catalytic phenomena are discussed considering the reaction mechanisms and the specific structure features of the obtained catalysts.

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Authors and Affiliations

  1. Faculty of Chemistry, Moscow State University, Moscow, 119991, Russia

    S. A. Nikolaev

  2. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninskii pr. 29, Moscow, 119991, Russia

    M. V. Chudakova, A. V. Chistyakov & M. V. Tsodikov

  3. Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrentieva 5, Novosibirsk, 630090, Russia

    V. V. Kriventsov

Authors
  1. S. A. Nikolaev
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  2. M. V. Chudakova
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  3. A. V. Chistyakov
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  4. V. V. Kriventsov
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  5. M. V. Tsodikov
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Correspondence to S. A. Nikolaev.

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Original Russian Text © S.A. Nikolaev, M.V. Chudakova, A.V. Chistyakov, V.V. Kriventsov, M.V. Tsodikov, 2012, published in Rossiiskie Nanotekhnologii, 2012, Vol. 7, Nos. 7–8.

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Nikolaev, S.A., Chudakova, M.V., Chistyakov, A.V. et al. Reductive dehydration of ethanol to hydrocarbons on Ni- and Au-containing nanocomposites. Nanotechnol Russia 7, 327–338 (2012). https://doi.org/10.1134/S199507801204009X

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  • DOI: https://doi.org/10.1134/S199507801204009X

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