Jump to main content
Jump to site search

Issue 11, 1998
Previous Article Next Article

The effect of iron on the crystalline phases formed upon thermal decomposition of Mg-Al-Fe hydrotalcites

Abstract

Layered double hydroxides (LDH) containing Mg II , Fe III , and Al III in the brucite-like layers and interlayer carbonate (with a constant M II /M III ratio but varying Al III /Fe III ratios) have been prepared and characterised by X-ray diffraction, thermal analysis, FT-IR and UV-VIS/diffuse reflectance spectroscopies, temperature-programmed reduction and specific surface area assessment through low temperature adsorption of N 2 . An Mg,Al-LDH, but with intercalated hexacyanoferrate(III), has been also prepared and characterised, in which simultaneous formation of the carbonate analogue did not occur. Thermal decomposition in air at 450 and 750°C leads to MgO and poorly crystallised MgFe 2 O 4 spinel (crystallinity increasing with the iron content), while for the hexacyano-containing sample, crystallization only is observed after calcination at 900°C. This different behaviour has been related to the initial location of the iron ions.

Back to tab navigation

Article type: Paper
DOI: 10.1039/A804867C
J. Mater. Chem., 1998,8, 2507-2514

  •   Request permissions

    The effect of iron on the crystalline phases formed upon thermal decomposition of Mg-Al-Fe hydrotalcites

    J. Maria Fernández, M. Angeles Ulibarri, F. M. Labajos and V. Rives, J. Mater. Chem., 1998, 8, 2507
    DOI: 10.1039/A804867C

Search articles by author

Spotlight

Advertisements