WS₂ has no significant oxidizing property—it is not an oxidizing agent. Its chemical structure (W⁴⁺, S²⁻) is stable, with tungsten in a moderate +4 oxidation state, lacking the electron-accepting capacity of strong oxidants (e.g., HNO₃, KMnO₄). WS₂ does not oxidize other substances under standard conditions, instead acting as a reductant when attacked by oxidants like O₂ or HNO₃, forming WO₃ (W⁶⁺).
In air, WS₂ oxidizes above 510°C (WS₂ + 7/2 O₂ → WO₃ + 2 SO₂), but this is a passive reaction, not an active oxidizing role. In inert conditions, it’s stable to 1250°C, showing no redox activity. Compared to MoS₂, WS₂ is less prone to oxidation, but neither oxidizes other materials. Its inertness suits applications like catalysis (e.g., hydrodesulfurization), where sulfur edges are active, not the bulk.
This lack of oxidizing power enhances WS₂’s stability in reducing environments, unlike peroxides or halogens. Tests (e.g., mixing with reductants like Fe²⁺) show no reaction, confirming its neutral-to-reducing nature.
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