Polyvinyl Chloride (PVC) plastics constitutes a large fraction of buildings, packaging and electronic devices, whereas, the annual emission electric arc furnace dust (EAFD) from steel manufacturing operations has recently peaked at nearly 6 Mt. Co-pyrolysis of PVC with EAFD currently represents a focal abatement technology for both categories of pollutants. However, despite of several experimental investigations; the mechanisms underlying interaction between EAFD and PVC remain largely speculative. Herein, we examine theoretically reactions of major products from thermal degradation of PVC with nanoclusters of iron (III) oxide, α-Fe 2 O 3 (hematite) as a representative model for the various metal oxides in EAFD. The facile nature for the H-Cl bond fission over hematite is in line with experimental findings, pointing out to formation of iron chlorides from pyrolysis of Fe 2 O 3-PVC mixtures. Interaction of selected chlorinated C 1-C 3 cuts with the hematite structure preferentially proceeds via a dissociative adsorption pathway. Results from this study shall be instrumental to understand, on a precise molecular basis, fixation of halogens on transitional metal oxides; a viabjjle thermal recycling approach for polymeric materials laden with halogenated constituents. Highlights • Reactions of HCl and chlorinated VOCs with iron (III) oxide have been analysed. • Successive dissociation of HCl on F-O bonds converts Fe 2 O 3 into iron chloride. • Decomposition of chlorinated VOCs mainly occurs by dissociative addition. • Results herein demonstrate the chlorine fixation ability of iron oxides.