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Chemical Papers

, Volume 73, Issue 2, pp 415–424 | Cite as

Physicochemical properties of layered double hydroxides by-product obtained from Al–MgO mechanochemical process to produce hydrogen

  • B. E. López-Muñoz
  • J. L. Iturbe-García
  • M. T. OlguinEmail author
Original Paper
  • 14 Downloads

Abstract

The characteristics of a by-product, both untreated (BP) and thermally treated (CBP), obtained from an Al-MgO mechanochemical process to produce hydrogen, is presented in this work. Commercial hydrotalcite (HTc), as well as its calcined form (CHTc), is included for comparison purposes. X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), Fourier-transform infrared spectroscopy (FT-IR), pH of the point of zero charge (pHPZC), thermogravimetry analysis (TGA), BET analysis, and fractal dimension, to characterize the by-product were considered. The results showed that the by-product corresponded to Mg–Al-layered double hydroxide with structural characteristics similar to the hydrotalcite. The surface area and pore volume of the materials notably increased after the thermal treatment (CBP and CHTc), and this thermal process is accompanied by an increase in the surface fractal dimension Df. After contact with H2O or a (NH4)2CO3 aqueous solution, the original CBP and CHTc crystalline structure was regenerated by the memory effect, showing that BP has a similar structure to a hydrotalcite compound. The mechanism of the by-product formation is also proposed in this work.

Keywords

By-product Hydrotalcites Memory effect Mg–Al-layered double hydroxide Al–MgO Fractal dimension pHpzc 

Notes

Acknowledgements

The authors acknowledge ININ for their laboratory analysis facilities, and Elvia Morales Moreno, Iris Zoet López Malpica, and Marcelino Villa Tomasa for their technical support. M. T. Olguín and B.E. López-Muñoz thank the partial financial support from the Consejo Nacional de Ciencia y Tecnología (Project 254665).

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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2018

Authors and Affiliations

  • B. E. López-Muñoz
    • 1
  • J. L. Iturbe-García
    • 1
  • M. T. Olguin
    • 1
    Email author
  1. 1.Departamento de QuímicaInstituto Nacional de Investigaciones NuclearesMexicoMexico

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