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                <term xml:lang="en">S/O exchange sulfur vacancy MoS 2 edges reaction mechanism structure-activity relationships deactivation</term>
                <term xml:lang="en">S/O exchange</term>
                <term xml:lang="en">sulfur vacancy</term>
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              <p>In previous reports, it was proposed that the oxygen-substituted Mo(S x O y) zc site formed in situ by water is active center for water-gas shift reaction catalyzed by MoS 2. However, water is also hypothesized to be the driving force for sulfide catalyst deactivation. This irreconcilable dispute stems from the limited understanding about the reaction mechanism and the lack of relevant in situ or/and operando characterization. In this work, the different reactivity of the two preferentially exposed MoS 2 edge sites, M-edge and S-edge sites, with CO and H 2 O is revealed by means of in situ CO adsorption followed by IR spectroscopy. Isotopic reactants (13 CO/ 12 CO ; H 2 18 O) were used to account for the origin of the formed products and catalyst surface modification. In particular, upon H 2 O feed, S/O exchange occurs</p>
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