FABRITCHNYI, Pavel B.; AFANASOV, Mikhail I.; ASTASHKIN, R. A.; WATTIAUX, Alain; LABRUGÈRE, Christine

doi:10.1016/j.apsusc.2014.09.005

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FABRITCHNYI, Pavel B.
Department of Chemistry

AFANASOV, Mikhail I.
Department of Chemistry

ASTASHKIN, R. A.
Department of Chemistry

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Applied Surface Science. 2014, vol. 320, p. 482-486

Elsevier

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Information provided by 119Sn2+ Mössbauer probe ions, located on surface sites of anatase-type TiO2 microcrystals exposed, at room temperature, to a H2S/H2 mixture, has permitted to conclude that the interaction of H2S molecules with the substrate surface leads to the dissociation of a fraction of the absorbate molecules. This gives rise to the formation of elemental sulfur which oxidizes the neighboring Sn2+ ions, the produced Sn4+ ions being found coordinated only by S2− anions. Subsequent exposure to ambient air is shown to result in the oxidation of S2− ions, yielding both S0 and SO42−-like species, with concomitant stabilization of Sn4+ ions in coordination polyhedra where they are surrounded by only oxygen anions.< Réduire

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Synthetic anatase

Tin dopant cations

119Sn Mössbauer probe

Dissociative adsorption of H2S

X-ray photoelectron spectroscopy

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Interactions of Sn2+ dopant ions located on surface sites of anatase-type TiO2 with adsorbed H2S molecules studied using 119Sn Mössbauer spectroscopic probe

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