Catalytic de-halogenation of alkyl halides by copper surfaces

O.H. Ahmed; M. Altarawneh; M. Al-Harahsheh; Z-T Jiang; B.Z. Dlugogorski

doi:10.1016/j.jece.2018.11.014

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Catalytic de-halogenation of alkyl halides by copper surfaces

Journal article

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Peer reviewed

Catalytic de-halogenation of alkyl halides by copper surfaces

O.H. Ahmed, M. Altarawneh, M. Al-Harahsheh, Z-T Jiang and B.Z. Dlugogorski

Journal of Environmental Chemical Engineering, Vol.6(6), pp.7214-7224

2018

DOI: https://doi.org/10.1016/j.jece.2018.11.014

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Abstract

The interplay of halogenated compounds with metal surfaces has been the focus of many experimental and theoretical studies. These investigations have mainly aimed to illustrate the potential dual role of transition metals and their oxides in mediating formation of toxic halogenated aromatics as well as their catalytic-assisted decomposition over these surfaces. An initial and prominent step in conversion of these precursors into heavier halogenated aromatics signifies their dissociative adsorption on metallic species readily present in the combustion media. This contribution represents a systematic computational study to examine thermo-kinetic parameters underlying rupture of Cl/Br-C bonds in halogenated model compounds (namely; 2-chloropropane, chloromethane, chloroethyne, chloropropene, chlorobenzene, 2-bromopropane, bromomethane, bromoethyne, bromopropene, and bromobenzene) over the Cu(100) surface. These compounds adapt very weak physisorbed molecular states evidenced by marginal adsorption energies and minimal structural changes, in reference to their gas phase molecules. The calculated reaction barriers for Cl/Br-C bond fissions are scattered in the range of 8.3 - 37.2 kcal mol-1. Stronger Cl – C bonds in reference to Br – C bonds (in the gas phase) translate into higher corresponding reaction barriers for the former. The calculated reaction rate constant and activation energies reveal faster rate for the decomposition of the brominated species. Our calculations of the activation energies correlate very well with analogues experiment values.

Details

Title: Catalytic de-halogenation of alkyl halides by copper surfaces
Authors/Creators: O.H. Ahmed (Author/Creator) - Murdoch University
M. Altarawneh (Author/Creator) - Al-Hussein Bin Talal University
M. Al-Harahsheh (Author/Creator) - Jordan University of Science and Technology
Z-T Jiang (Author/Creator) - Murdoch University
B.Z. Dlugogorski (Author/Creator) - Murdoch University
Publication Details: Journal of Environmental Chemical Engineering, Vol.6(6), pp.7214-7224
Publisher: Elsevier Ltd
Identifiers: 991005541204607891
Murdoch Affiliation: School of Engineering and Information Technology
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.41 Catalysts; 2.41.25 Catalytic Oxidation
Web Of Science research areas: Engineering, Chemical; Engineering, Environmental
ESI research areas: Engineering