Reaction of H2S and S2 with metal/oxide surfaces: band-gap size and chemical reactivity
Article Abstract:
Synchrotron-based high-resolution photoemission was used to analyze adsorption and dissociation of H2S and S2 on a series of oxide and metal/oxide surfaces. H2S and S2 generally interact with the metal centers of oxides. At 300 K, H2S undergoes total decomposition. The rate of decomposition on Al2O3 is much lower than those observed on Cr3O4, Cr2O3, ZnO and Cu2O. For these systems, the smaller the band gap in the oxide, the bigger its reactivity toward S-containing molecules. The use of ab initio self-consistent-field calculations and a model that unifies perturbation theory with Huckel and tight-binding approach are discussed.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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XANES characterization of extremely nanosized metal-carbonyl subspecies (Me=Cr, Mn, Fe, and Co) confined into the mesopores of MCM-41 materials
Article Abstract:
The local structure and structure characteristics of transition metal species confined in the mesopores of the MCM-41 material where X-ray absorption near-edge spectroscopy (XANES) emerges as an especially appropriate technique is determined. XANES experimental data indicate that metal atoms are highly dispersed since they are not forming metal oxide bulklike species.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2004
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Influence of N-doping on the structure and electronic properties of titania nanoparticle photocatalysts
Article Abstract:
N-containing Ti[O.sub.2]-based nanostructured materials with an anatase-type structure are investigated by using oxygen (O) K-edge and titanium (Ti) K- and L-edge X-ray absorption near-edge spectroscopy (XANES). The influence of N-doping on titania nanoparticles and their structure, electronics and photocatalytic activity is discussed.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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