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Thermal degradation of poly (vinyl chloride) (PVC) over magnetite (111) surface

Ahmed, O.H., Altarawneh, M.ORCID: 0000-0002-2832-3886, Jiang, Z-T and Dlugogorski, B.Z. (2017) Thermal degradation of poly (vinyl chloride) (PVC) over magnetite (111) surface. In: Inaugural Murdoch University Annual Research Symposium (MARS), 8 November 2017, Murdoch University, Perth.

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Crude steel manufacturing operations are accompanied by emission of a large amount of hazardous electric arc furnace dust (EAFD) (around 20 kg of dust per each ton of produced steel). Global production of polyvinyl chloride (PVC) plastics is projected to grow to about 180 million tons in 2021. Combined treatment of both EAFD and PVC is a promising technique for extracting valuable metals from EAFD as it is a solution to minimize their environmental harmfulness. However, despite of many detailed experimental studies over the last few years; the specific underlying mechanism of the reactions between EAFD and PVC remain largely poorly understood.

This contribution provides a systematic theoretical thermo-kinetic study of the initial reactions between (Fe3O4)(111) surface, as a representative model for metal oxides in EAFD with HCl and selected chlorinated hydrocarbons, as major products from thermal degradation of PVC. Breakage of the H-Cl bond over magnetite and the formation of iron chlorides is in line with experimental findings, pointing out to degradation of organic contaminants through their reaction with magnetite. Moreover, in analogy to the well-documented role of alumina and other metal oxides, the catalytic-assisted HCl removal demonstrated herein indicates that, iron oxides serve as active catalysts in producing clean olefins streams from chlorinated alkanes. Results from this study should be instrumental to understand, on a precise atomic scale, fixation of halogens on transitional metal oxides; a viable thermal recycling approach for polymeric materials laden with halogenated constituents.

Item Type: Conference Item
Murdoch Affiliation: School of Engineering and Information Technology
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