Investigating the effects of guest-host interactions on the properties of anion-exchanged Mg-Al hydrotalcites - Swinburne Research Bank : Open Access Repository

My Folder (0)

Add to My Folder

Permanent link: http://hdl.handle.net/1959.3/214260

Check Swinburne's subscriptions for full text availability

Title: Investigating the effects of guest-host interactions on the properties of anion-exchanged Mg-Al hydrotalcites
Author(s): Malherbe, Francois; Besse, Jean-Pierre
Abstract: A starting [Mg-Al-Cl] LDH, prepared by coprecipitation, was further anion-exchanged to incorporate a variety of anions in the interlayer domain: (Fe(CN)6)3-, (P2O7)4-, (V2O7)4-, (CrO4)2-, and (Cr2O7)2-. The resulting materials were fully characterized using classical techniques like XRPD, FTIR, TGA/DTA, and BET, and their structural modifications studied as a function of calcination temperatures. Under mild calcination, only the oxo-anions were shown to interact strongly with the host matrix. This resulted in a systematic shrinkage of the interlamellar domain, with a negative impact on the surface properties. However, intercalation of oxo-anions proved to be beneficial to thermal stability, the lamellar structure being maintained up to 400°C in the case of the dichromate intercalated [Mg-Al]. A thorough analysis of the FTIR spectra, revealing an evolution in the symmetry of some oxo-anions, confirmed the occurrence of a grafting process. Furthermore, the permanent character of the pillars was evidenced through unsuccessful rehydration and back-exchange reactions.
Publication Type: Journal article
Source: Journal of Solid State Chemistry, Vol. 155, no. 2 (Dec 2000), p. 332-341
Publication Year: 2000
FOR Code(s): 0302 Inorganic Chemistry; 0303 Macromolecular and Materials Chemistry; 0306 Physical Chemistry (Incl. Structural)
Keyword(s): Exchange; Hydrotalcite; Layered double hydroxides; Oxo-anions; Thermal behavior
Publisher: Academic Press
Publisher URL: http://dx.doi.org/10.1006/jssc.2000.8922
ISSN: 0022-4596
Peer Reviewed