Nickel, iron-containing clay minerals from Niquelandia deposit, Brazil 2. Behaviour under reducing conditions

Coelho, ACV;Ladrière, Jean;Poncelet, Georges
(2000) Applied Clay Science — Vol. 17, n° 3-4, p. 183-204 (2000)

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Authors
  • Coelho, ACV
    Author
  • Ladrière, JeanUCLouvain
    Author
  • Poncelet, GeorgesUCLouvain
    Author
Abstract
The reduction behavior of two Ni, Fe-rich dioctahedral smectite clays has been investigated by temperature-programmed reduction (TPR). For both clays, the reduction process of the transition metal elements occurs in two steps. At about 400 degrees C, Fe3+ is first reduced to Fe2+. At higher temperatures, further reduction of iron and reduction of nickel are achieved. Samples reduced at 400 degrees C and 700 degrees C have been characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Mossbauer spectroscopy (MS), and transmission electron microscopy (TEM). After a treatment at 700 degrees C, metallic particles deposited on the silicates has been evidenced by TEM and confirmed with the other techniques. (C) 2000 Elsevier Science B.V. All rights reserved.
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Coelho, A., Ladrière, J., & Poncelet, G. (2000). Nickel, iron-containing clay minerals from Niquelandia deposit, Brazil 2. Behaviour under reducing conditions. Applied Clay Science, 17(3-4), 183-204. https://doi.org/10.1016/S0169-1317(00)00013-2 (Original work published 2000)