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F. A. Cotton

Bio: F. A. Cotton is an academic researcher. The author has contributed to research in topics: Oxygen & Molybdenum. The author has an hindex of 1, co-authored 1 publications receiving 221 citations.
Topics: Oxygen, Molybdenum

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Journal ArticleDOI
TL;DR: In this article, the infrared and Raman spectra of powder samples of WO3 (monoclinic and hexagonal) and XH 2 O (x = 1,2, 1 3 ) have been recorded and the most characteristic vibrations are discussed with reference to the available structural data.

856 citations

Journal ArticleDOI
TL;DR: In this article, the molecular structures of the surface metal oxide species are reflected in the terminal M=O and bridging M-O-M vibrations, which are typically obtained in Raman and IR characterization studies of supported metal oxide catalysts.

781 citations

Journal ArticleDOI
TL;DR: In this article, the infrared and Raman spectra of powder samples of MoO3 (orthorhombic and monoclinic) and MoO 3 · x H 2 O (x = 1 3, 1 2, 1 and 2) have been recorded.

437 citations

Journal ArticleDOI
TL;DR: In this article, the sulfidation of crystalline MoO3 and the thermal decomposition of (NH4)2MoO2S2 to MoS2 via an {MoOS2} oxysulfide intermediate have been studied by means of monochromatic X-ray photoelectron spectroscopy (XPS) and IRES.
Abstract: The sulfidation of crystalline MoO3 and the thermal decomposition of (NH4)2MoO2S2 to MoS2 via an {MoOS2} oxysulfide intermediate have been studied by means of monochromatic X-ray photoelectron spectroscopy (XPS) and infrared emission spectroscopy (IRES) Several basic steps of the sulfidation reaction could be resolved and explained in terms of the structure of crystalline MoO3 The sulfidation reaction starts at low temperatures with an exchange of terminal O2- ligands of the oxide for S2- by reaction with H2S from the sulfiding atmosphere In subsequent Mo−S redox reactions, bridging S22- ligands and Mo5+ centers are formed Lattice relaxation and further sulfur uptake are the main processes before, at temperatures above 200 °C, direct reactions with H2 occur, during which the Mo5+ centers are converted into the 4+ oxidation state The decomposition experiments with (NH4)2MoO2S2 show that terminal O2- ligands serve as the reactive sites The conversion of terminal MoOt to MoS entities and the subsequent

418 citations

Journal ArticleDOI
TL;DR: A comparative study of the series of tungsten and molybdenum, α-XM12O40n− (X = BIII, SiIV, GeIV, PV, AsV) was carried out by using i.r. and Raman spectroscopy.

359 citations