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Gold Bulletin

, Volume 51, Issue 1–2, pp 35–44 | Cite as

Synthesis and characterization of gold-containing oxides of K2NiF4 or Nd2CuO4 structure type

  • Jerffersson Rodríguez Delgado
  • Verónica García Rojas
  • Gilles H. Gauthier
Original Paper

Abstract

In this work, different materials of Nd2CuO4 and K2NiF4 Ruddlesden-Popper structure have been prepared by solid-state reaction in air and high temperatures. The powders of mixed oxides, of general formula La2Li0.5M0.5 − xAu x O4 (M = Cu, Ni), were prepared from [Au(NH3)4](NO3)3 as gold source. The stoichiometric proportions of the all reagents (including La2O3, NiCO3, CuO) were grounded with a LiOH excess as mineralizer, pressed to form into pellets and heated in static air at temperatures between 750 and 850 °C for several hours. Structural characterization of the synthesized oxides using X-ray diffraction (XRD) are presented. La2Li0.5Au0.5O4, La2Li0.5Cu0.5O4, and La2Li0.5Ni0.5O4, three previously known oxides, were obtained. As expected, La2Li0.5Ni0.5O4 and La2Li0.5Cu0.5O4 consist of an ordered K2NiF4 Ruddlesden-Popper structure, while the La2Li0.5Au0.5O4 compound exhibits a Nd2CuO4 type structure. On the other hand, the preparation of the new proposed group La2Li0.5M0.5 − xAuxO4 (x = 0.0125–0.5) containing gold and nickel/copper simultaneously, under the studied conditions, was not possible. The experimental results revealed that the host structures are intolerant with respect to M (Cu or Ni) and Au cation double substitution. The difficulty to obtain the new phases is discussed regarding the exceptional instability displayed by the trivalent state of gold ion (Au3+) and the soft interactions of this specie with the lithium cation. Finally, the monophasic oxides, more interesting in terms of catalytic activity, were analyzed by temperature-programmed reduction (TPR-H2).

Keywords

Mixed oxide Gold Synthesis 

Notes

Acknowledgements

The authors are grateful to UIS’ Microscopy and Xray Laboratory (Parque Tecnológico Guatiguará) for the technical support. The Universidad Industrial de Santander is also acknowledged for supporting and funding this work (internal project VIE 5195 and movilidad program 2018).

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Grupo de Investigación en Química Estructural—GIQUEUniversidad Industrial de SantanderBucaramangaColombia
  2. 2.Grupo INTERFASEUniversidad Industrial de SantanderBucaramangaColombia

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