Thermodynamics of Molten Sulfate Mixtures
| Autor: | W. L. Worrell, A. K. Misra, D. P. Whittle |
|---|---|
| Rok vydání: | 1982 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Chemistry Enthalpy of fusion Non-blocking I/O Enthalpy Inorganic chemistry Analytical chemistry Atmospheric temperature range Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Gibbs free energy symbols.namesake Materials Chemistry Electrochemistry Melting point symbols Heat fusion Phase diagram |
| Zdroj: | Journal of The Electrochemical Society. 129:1840-1845 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1.2124305 |
| Popis: | Quantitative studies of the formation of low melting point sulfates were made by equilibrating NiO-Na/sub 2/SO/sub 4/ mixtures with argon-SO/sub 2/-SO/sub 3/-air mixtures of different compositions in the temperature range 1000-1173 K. Using these data and the Na/sub 2/SO/sub 4/-NiSO/sub 4/ phase diagram, the enthalpy of fusion and melting temperature of NiSO/sub 4/ were estimated. An equation is given for the free energy change for the reaction NiO(s)+SO/sub 3/(g).NiSO/sub 4/(l) (dissolved in Na/sub 2/SO/sub 4/). This has then been used to calculate the minimum P/sub SO(3)/ required for liquid sulfate formation. Similar calculations were carried out from existing data for the CoSO/sub 4/-Na/sub 2/SO/sub 4/ system, and verified by a limited number of experiments. The calculated minimum P/sub SO(3)/ required for liquid sulfate formation is approximately an order of magnitude lower for Co-base alloys compared with Ni-base alloys, and the implications of this with regard to hot corrosion are briefly discussed. 16 refs. |
| Databáze: | OpenAIRE |
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