The structures and thermodynamic stability of copper(ii) chloride surfaces

Mohammednoor Altarawneh, Zhong Tao Jiang, Bogdan Z. Dlugogorski

Research output: Contribution to journalArticle

Abstract

Using density functional theory calculations of periodic slabs, within the generalised gradient approximation, this study provides optimised structures for all plausible terminations of copper(ii) chloride surfaces along the three low-index orientations. The ab initio atomistic thermodynamic approach serves to construct a thermodynamic stability diagram for CuCl 2 configurations as a function of the chemical potential of chlorine (Δµ Cl (T, P)). We observe a shift in thermodynamic stability ordering at around Δµ Cl (T, P) = -1.0 eV between a copper-chlorine terminated (001) surface (i.e., (001)CuCl) and a (001) chlorine-covered surface (i.e., (001)Cl). This conclusion accords with experimental observations that report CuCl-bulk like structures, acting as a prerequisite for the formation of CuCl 2 -bulk like arrangements in the course of copper chlorination. Profound stabilities and optimised structures of (001)CuCl and (001)Cl configurations are discussed within the context of the functionality of CuCl 2 as the chief chlorination and condensation catalyst of aromatic pollutants under conditions relevant to their formation in thermal systems, i.e. 400-1000 K, a total operating pressure of 1.0 atm and P Cl 2 = 10 -6 -10 -4 atm (1.0-100.0 ppm).

Original languageEnglish
Pages (from-to)24209-24215
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number44
Early online date24 Sep 2014
DOIs
Publication statusPublished - 21 Oct 2014
Externally publishedYes

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