Thermal analysis and kinetics of oxidation of molybdenum sulfides

  title={Thermal analysis and kinetics of oxidation of molybdenum sulfides},
  author={Y. Shigegaki and S. K. Basu and M. Wakihara and M. Taniguchi},
  journal={Journal of thermal analysis},
AbstractThe thermal oxidation process of stoichiometric MoS2 and nonstoichiometric “Mo2S3”, together with the kinetics of oxidation of MoS2, were studied by using TG and DTA techniques in the Po2 range 1-0.0890 atm. MoS2 was oxidized completely to MoO3 in one step: $$MoS_2 + 7/2O_2 \to MoO_3 + 2SO_2 $$ Irrespective of Po2 and the heating rate, “Mo2S3” was oxidized finally to MoO3, via the following four steps: $$\begin{gathered} ''Mo_2 S_3 ''\xrightarrow{I}\gamma - Mo_4 O_{11(sur)} + ''Mo_2… Expand
Performance and stability of composite nickel and molybdenum sulfide-based anodes for SOFC utilizing H2S
Abstract Performances of four anode compositions with different weight ratios of Ni 3± x S 2 to MoS 2 (2:1, 1:1, 1:2 and 1:4) were compared for H 2 S oxidation in SOFC at 700–850 °C. Their thermalExpand
In situ thermal oxidation kinetics in few layer MoS2
It is important to understand the thermal and chemical stability of mono- and few-layer MoS2 for their use in applications. Oxidative environments are of particular interest due to the potential forExpand
Oxidation of core–shell MoO2–MoS2 nanoflakes in different O2 ambience
Oxidation of MoO2/MoS2 core–shell nanoflakes (NFs) has been investigated in different oxidation ambients i.e. oxygen (O2) gas and its plasma. Core–shell nanoflakes are oxidized at temperaturesExpand
Measurements of the formation enthalpy of Mo6S8 − y clusters
Abstract The combustion enthalpies of Mo 6 S 8 − y clusters (7.8 ≤ 8 − y ≤ 8.0) were measured at 773 K in flowing oxygen using a Calvet-type twin calorimeter. There was a maximum value at the sulfurExpand
Separation of Rhenium from Lead-Rich Molybdenite Concentrate via Hydrochloric Acid Leaching Followed by Oxidative Roasting
Lead-rich molybdenite is a typical rhenium-bearing molybdenum resource in China, which has not been efficiently utilized due to its high contents of lead and gangue minerals. In this study,Expand
Oxidation roasting of molybdenite concentrate
In order to investigate the oxidation roasting of molybdenite concentrate in pure oxygen atmosphere, experiments at 673, 723, 773, 873 and 973 K were carried out. The phase transitions and morphologyExpand
Thermal effects of minority chalcogenide minerals: dta-tg, Ir spectroscopy and sem electron microscopy studies
Aspects related to the thermal behaviour of minority chalcogenides containing Bi, Sb, Pb, Cu and Ag, associated with massive binary sulfides of economical importance, have been analyzed and compared.Expand
How stable are inorganic fullerene-like particles? Thermal analysis (STA) of inorganic fullerene-like NbS2, MoS2, and WS2 in oxidizing and inert atmospheres in comparison with the bulk material
Two-dimensional compounds (like graphite or MoS2) are capable of bending their layers and forming a closed cage structure, which is denoted the inorganic-fullerene-like (IF) phase in the case ofExpand
Sonochemical edge functionalisation of molybdenum disulfide.
MoS2 nanosheets exfoliated in acetone have an oxygen edge functionalisation, in the form of molybdenum oxides, changing its interaction with solvents and explaining the observed high-quality and stability of the resulting dispersion in a low boiling point solvent. Expand
Processing of spent molybdenum-bearing catalysts from petrochemical synthesis
Technologies for processing spent molybdenum-bearing catalysts from petrochemical production are reviewed. The degree of molybdenum-trioxide extraction from the spent catalysts is presented forExpand


Thermal analysis and kinetics of oxidation of “Cr3S4” and “Cr2S3”
Abstract The thermal analysis and kinetics of oxidation of monoclinic “Cr 3 S 4 ”, trigonal “Cr 2 S 3 ” and rhombohedral “Cr 2 S 3 ” phases were studied by using both thermogravimetry and highExpand
The kinetics of molybdenum dioxide oxidation
AbstractPowdered molybdenum dioxide was oxidized to MoO3 in the temperature range 390 to 465°C under oxygen partial pressures of 0.016 and 0.18 atmospheres* and under 0.009 atmospheres in theExpand
Phase relationship on Mo-S system at high temperatures
Abstract Changing the partial pressure of sulfur Ps 2 at temperatures of 750° and 950°C, phase equilibria on the Mo-S system by solid-gas reaction were investigated. Hexagonal 2H-MoS 2 and monoclinicExpand
The oxidation kinetics of molybdenite at 525° to 635°C
An investigation on the oxidation of molybdenite is reported. Samples of molybdenite concentrate (ca. 90 pct MoS2) were oxidized using a thin layer technique in which the temperature and gasExpand
Kinetics of oxidation of “V5S8” and V3S4
The kinetics of oxidation of “V5S8” and V3S4 to V2O3 were studied by using both isothermal and nonisothermal thermogravimetry in the oxygen partial pressure range from 1.0×10−1 to 1.0×10−3 atm. TheExpand
Fluidized bed roasting of molybdenite-effect of operating variables
The results of an investigation on the fluidized bed roasting of molybdenite are reported. Molybdenite mixed with quartz was subjected to an oxidizing roast in a 22 mm diam stainless steel batchExpand
The determination of oxygen in gas mixtures by electromotive force measurements using solid oxide electrolytes
The behavior of impervious ZrO2+ 10 mole pct CaO electrolyte tubes was studied at 500∮ to 1100° in oxygen concentration cells of the type (−) Ar-O2or CO-CO2/ZrO2-CaO/O2(+) The equilibrium oxygenExpand
Friction Characteristics of Transition-Metal Disulfides and Diselenides
The disulfides and diselenides of the second and third row transition metals from Groups 4 through 7 have been studied for their ability to function as solid lubricants. These materials have similarExpand
Estimation of the homogeneity range of MoS2
Abstract The sulphur pressure as a function of composition and temperature has been investigated in MoS2 with both large and small concentrations of stacking faults. This was done by stepwiseExpand
Kinetic Parameters from Thermogravimetric Data
THE use of thermogravimetric data to evaluate kinetic parameters of solid-state reactions involving weight loss (or gain) has been investigated by a number of workers1–4. Freeman and Carroll2 haveExpand