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Strong metal support interaction state in the Fe/TiO2 system- an XPS study
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In this article, strong metal support interaction with supported group VIII metals is associated with the phase transformation of the support employed, which is identified to have arisen from the formation of a ternary oxide phase and its subsequent reorganization under high temperature reduction conditions.Abstract:
Strong metal support interaction with supported group VIII metals is associated with the phase transformation of the support employed. The reduced uptake of hydrogen and the enhanced reactivity in CO hydrogenation in these systems are associated with the geometrical dispersion of the metal species, which is identified to have arisen from the formation of a ternary oxide phase and its subsequent reorganization under high temperature reduction conditions. XPS experimental evidence is provided for this postulate.read more
Citations
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Magnetically separable composite photocatalyst with enhanced photocatalytic activity.
TL;DR: The composite photocatalyst can be easily separated from solution by a magnet, its photocatalytic activity in degradation of phenol in aqueous solution also has dramatic enhancement compared to that of the neat titania.
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Influence of iron leaching and oxidizing agent employed on solar photodegradation of phenol over nanostructured iron-doped titania catalysts
TL;DR: In this article, an analysis of the photoactivity as a function of the oxidizing agent employed, either H 2 O 2 or oxygen from air, is also performed, based on the presence of additional catalytic contributions from new photoactive species, resulting from surface modifications produced under reaction conditions related to the existence of phenomena of iron leaching from the catalysts.
Journal ArticleDOI
Preparation of Magnetic Photocatalyst TiO2Supported on NiFe2O4and Effect of Magnetic Carrier on Photocatalytic Activity
TL;DR: In this article, a magnetic photocatalyst with typical ferromagnetic hysteresis was prepared by a sol-gel method, which is easy to be separated from a slurry-type photoreactor under the application of an external magnetic field, being one of promising photocatalysts for wastewater treatment.
Journal ArticleDOI
Development of the IR laser pyrolysis for the synthesis of iron-doped TiO2 nanoparticles: Structural properties and photoactivity
Rodica Alexandrescu,Ion Morjan,M. Scarisoreanu,R. Birjega,Claudiu Fleaca,I. Soare,L. Gavrila,Victor Ciupina,William Kylberg,Egbert Figgemeier +9 more
TL;DR: In this paper, pure and Fe-doped TiO 2 nanoparticles with rather low Fe concentration were prepared by applying the sensitized IR laser pyrolysis to a gas mixtures containing titanium tetrachloride, air and iron pentacarbonyl (vapors).
Journal ArticleDOI
Fe-Ti-O based catalyst for large-chiral-angle single-walled carbon nanotube growth
Maoshuai He,Maoshuai He,Lili Zhang,Hua Jiang,He Yang,Frederic Fossard,Hongzhi Cui,Zhipei Sun,Jakob Birkedal Wagner,Esko I. Kauppinen,Annick Loiseau +10 more
TL;DR: In this article, a Fe Ti O solid solution was designed for carbon nanotubes (SWNTs) with a high preference to large chiral angles. But, it was not shown that the phase segregation through reducing Fe Ti Ti O catalyst leads to the formation of small Fe nanoparticles for SWNT growth.
References
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Journal ArticleDOI
Core and valence level photoemission studies of iron oxide surfaces and the oxidation of iron
TL;DR: The core and valence level XPS spectra of FexO (x ~ 0.90-0.95), Fe2O3 (α and γ), Fe3O4; and FeOOH have been studied under a variety of sample surface conditions as discussed by the authors.
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Metal-support interactions between iron and titania for catalysts prepared by thermal decomposition of iron pentacarbonyl and by impregnation
TL;DR: The metal-support interaction between iron and titania, which is initiated by reduction at 800 K and is responsible for the changes in ammonia synthesis kinetics, is due to titanium species at the surface of the metallic iron particles as mentioned in this paper.
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Titanium oxide based catalysts - a review
S. Matsuda,A. Kato +1 more
TL;DR: In this article, the application and physico-chemical properties of TiO2-based catalysts are discussed and the preparation procedure of a high surface area TiO 2 support is briefly summarized.
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X-ray photoelectron spectroscopy of TiO2 and other titanate electrodes and various standard Titanium oxide materials: Surface compositional changes of the TiO2 electrode during photoelectrolysis
Curt N. Sayers,Neal R. Armstrong +1 more
TL;DR: In this paper, surface compositional changes were observed for TiO2 single crystal electrodes used for photo-electrolysis of water, and they were compared with a variety of titanium, titanium oxide and titanium hydride standard materials.
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Mechanism of crystal structure transformations. Part 3. Factors affecting the anatase-rutile transformation
TL;DR: In this paper, the authors studied the kinetics of the transformation of anatase from titanium sulphate to rutile and found that the transformation becomes immeasurably slow below ~695±10°C compared to ~610°C for pure anatase.