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Structural reversibility of a ternary CuO–ZnO–Al2O3 ex hydrotalcite-containing material during wet Pd impregnation

López Granados, M., Melián-Cabrera, I. & Fierro, J. L. G., 2002, In : Catalysis Letters. 84, 3-4, 9 p.

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  • Structural Reversibility of a Ternary CuO-ZnO-Al2O3ex Hydrotalcite-Containing Material During Wet Pd Impregnation

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DOI

  • M. López Granados
  • I. Melián-Cabrera
  • J.L.G. Fierro
A Cu–Zn–Al precursor was synthesized by coprecipitation of the corresponding cations with sodium carbonate at constant pH and temperature. CuO–ZnO–Al2O3 composite oxide support was obtained by calcination (673 K) of the Cu–Zn–Al precursor. Two palladium-modified CuO–ZnO–Al2O3 samples were prepared by impregnation of the mixed-oxide support and further calcination (673 K). The presence of remaining CO32– anions in the CuO–ZnO–Al2O3 mixed oxide, as a result of incomplete Cu–Zn hydrotalcite phase decomposition, and the hydrothermal-like treatment during the Pd impregnation step, allow the partial reconstruction of the Cu–Zn hydrotalcite-type structure (memory effect). In addition, an enhancement in the CuO crystallinity was obtained for the Pd-modified oxides. A detailed characterization revealed that the hydrotalcite restoration enhances the crystallinity of the copper oxide as a consequence of a crystalline rearrangement of this oxidic phase.
Original languageEnglish
Number of pages9
JournalCatalysis Letters
Volume84
Issue number3-4
Publication statusPublished - 2002

    Keywords

  • rehydration, methanol synthesis catalysts, hydrotalcite reconstruction, Pd-modified materials

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