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A kinetic and mechanistic study into the formation of the Cu-Cr layered double hydroxide

Williams, GR; Clout, A; Burley, JC; (2013) A kinetic and mechanistic study into the formation of the Cu-Cr layered double hydroxide. Physical Chemistry Chemical Physics , 15 (22) 8616 - 8628. 10.1039/c3cp44339f. Green open access

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Abstract

The formation of the layered double hydroxide [Cu2Cr(OH)6]Cl·yH2O from the reaction between CuO and aqueous CrCl3·6H2O was explored using synchrotron X-ray diffraction and ex situ analyses. The use of hard X-rays permitted time-resolved in situ studies to be performed as the reaction proceeded under a range of conditions. Additional information was obtained from ex situ experiments in which aliquots of the reaction mixture were removed, quenched, and subsequently analysed by laboratory X-ray diffraction, IR, UV-visible, and atomic emission spectroscopies. On the basis of these data, it is proposed that the reaction involves three steps. First, the solid CuO starting material is hydrolysed to give Cu(OH)2 chains, releasing Cu(2+) ions into solution. The Cu hydroxide chains subsequently condense with aqueous Cr(3+) species, Cl(-) ions and water molecules to give a hydrated form of the LDH. This material then extrudes some water to form a phase with a reduced interlayer spacing.

Type: Article
Title: A kinetic and mechanistic study into the formation of the Cu-Cr layered double hydroxide
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1039/c3cp44339f
Publisher version: http://dx.doi.org/10.1039/c3cp44339f
Language: English
Keywords: Chromium, Copper, Hydroxides, Kinetics, Synchrotrons, X-Ray Diffraction
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > UCL School of Pharmacy
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > UCL School of Pharmacy > Pharmaceutics
URI: https://discovery.ucl.ac.uk/id/eprint/1386538
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