Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 104, Issue 1, Pages 133-140Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2007.02.098
Keywords
layered double hydroxides; intercalation; decomposition; thermal properties
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The nickel(II) citrate complex anion ([Ni(C6H407)](2-)) may be intercalated into the interlayer galleries of a layered double hydroxide (LDH) host by a process involving ion-exchange with an Mg2Al-NO3 LDH precursor. The powder X-ray diffraction (XRD) pattern confirms that the layered structure is maintained. The thermal decomposition process of the complex anion-intercalated material has been characterized by in situ high temperature powder XRD, thermogravimetry-differential thermal analysis (TG-DTA) and coupled with mass spectrometry (MS). The thermal stability of the nickel(II) citrate complex anion intercalated in LDHs in air is lower than that in the sodium salt. Calcination generates a high degree of nickel(II) oxide dispersion in a matrix of magnesium and alummium oxide phases which should be an advantage if the materials are used as catalyst precursors. Based on the observed data, a structural model for the [Ni(C6H4O7)](2-) anion intercalated in the galleries of the LDH is proposed. (c) 2007 Elsevier B.V. All rights reserved.
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