Which bond-breaking mechanism occurs within vanadium catalytic converters when exposed to hydrogen sulfide (H2S) during tail gas treatment?

💡 Explanation

When H2S interacts with the catalyst, hydrogen abstraction occurs resulting in the transfer of hydrogen atoms to sulfur atoms bonded on the catalyst surface, thereby weakening adjacent vanadium-oxygen bonds through induced electronic stresses which subsequently can break. Therefore, hydrogen abstraction is the key mechanism, rather than direct poisoning, reduction or oxidation which would necessitate completely different chemical pathways and material properties.

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