The decomposition kinetics of molybdenite in an argon plasma

Abstract

APPENDIXThe molecular-dynamic results of Alder are given in a form where the Holmholtz energy is the sum of a hard-sphere part and a perturbation part; the latter follows from attractive intermolecular forces. These are represented by a square-well potential where the width of the well is a fixed multiple ( H ) of the hard-sphere diameter. For the hard-sphere part we use the Carnahan-Starling equation. For the perturbation part we use Alder's results: The dimensionless constantsA, are n = l , M = 6 n = 2 , M = 9 n = 3 , M = 5 n = 4 , M = 4 A43 = -0.41246808 X 10' When For methane the effect of temperature on vbsp is given by ---~' s p where subscript sp (specific) indicates that u' is per gram.in an Argon Plasma A reactor system was developed for the study of heterogeneous reaction kinetics in plasma tail flames. This system was used to investigate the thermal decomposition kinetics of stationary particles of molybdenum disulfide in both the molten and solid state when exposed to argon flames in the temperature range 3 OOOOK to 8 00O0K.In the solid state a shrinking-core reaction model was obeyed. The rate of reaction was largely controlled by the diffusion of sulfur vapor outwards through the product layer. An apparent activation energy of 134

Chlorination kinetics of zirconia in an RF chlorine plasma tail flame

“…The uniform reacting pellet model is treated as a special case ofdiffuse zone reaction models. The shrinking core model was found useful in analyzing many solid-gas, reactions including porous solids, owing to its mathematical simplicity (Costa and Smith, 1971; Wang and Wen, 1972;Munz and Gauvin, 1975;Morris and Jensen, 1976;Fahim and Ford, 1976).…”

Formation mechanism of Fe-Mo master alloy by aluminothermic reduction of MoS2-Fe2O3 in the presence of lime

“…However, significant studies have been done with regard to the kinetics of molybdenum compounds, especially molybdenite roasting and molybdenum oxide reduction processes. For example, Munz and Gauvin studied the kinetics of molybdenite decomposition in argon plasma [16]. Nita et al, have also covered the self-diffusion phenomenon in Fe-Mo systems [17].…”