Journal ArticleDOI
Determination of Diffusion Coefficients
B. Serin,R. T. Ellickson +1 more
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TLDR
In this article, the diffusion equations derived from Fick's law were applied to experimental data in the literature on the diffusion of oxygen in copper and on reaction rates for chemical reactions in the solid phase.Abstract:
Diffusion equations derived from Fick's law are discussed and applied to experimental data in the literature on the diffusion of oxygen in copper and on reaction rates for chemical reactions in the solid phase. Previous limitations on the applicability of the formulae are removed by the use of a simple graphical method so that the theory can be applied to data to which it was previously inapplicable. It is pointed out that the exact solution to Fick's law obtained is equivalent to the parabolic law in the early stages of the diffusion process. The activation energy for the diffusion of oxygen in copper is found to be 50.5 kcal. per g‐atom.read more
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Kinetic model of the oxidation of ZrSi2 powders
TL;DR: In this article, the oxidation kinetics of Zr-disilicide powders up to temperatures of 1550°C were studied in flowing air using non-isothermal and isothermal thermogravimetric (TG) analysis.
Journal ArticleDOI
Pt/ZSM-22 with Partially Filled Micropore Channels as Excellent Shape-Selective Hydroisomerization Catalyst
Guang Lv,Guang Lv,Congxin Wang,Ping Wang,Ping Wang,Lei Sun,Liu Hao,Wei Qu,Donge Wang,Huaijun Ma,Zhijian Tian +10 more
TL;DR: Pt/ZSM-22 with partially filled micropore channels was prepared through a facile in-situ coke deposition approach as discussed by the authors, and the results showed that the turnover frequency of n−dodecane and the maximum multibranched isomer yield on Pt/Z22•PF are about twice that on Pt•Z22−E (314 vs. 144'h−1, 49'% vs. 29'%).
Journal ArticleDOI
Index of Reaction-A Unifying Concept for the Reaction Kinetics of Powders
TL;DR: The index-of-reaction equation, dF/d(tz) = k'(1-βF)m, generalizes the linear, competing-nuclei, Austin-Rickett, limited-extent, and other kinetic equations for the reaction of solids.
Journal ArticleDOI
Mechanism and kinetics for the formation of uranium mononitride by the reaction of uranium dioxide with carbon and nitrogen
Tadasumi Muromura,Hiroaki Tagawa +1 more
TL;DR: In this article, the mechanism and kinetics of UN formation by reaction of a pellet of mixed UO/sub 2/ and C with N/Sub 2/ were studied for temperatures of 1420 to 1750/sup 0/C.
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Kinetic analysis of silicothermic process under flowing argon atmosphere
TL;DR: The Pidgeon process, a silicothermic reduction of calcined dolomite under vacuum, is the dominant process to make magnesium metal as mentioned in this paper, and the results suggest that the reaction is controlled by the solid-state diffusion of reactants with the Jander and Ginstling-Brounshtein model providing the best representation of the process kinetics.