Heat Capacities and Entropies of Molybdenum and Tungsten Trioxides

Seltz, Harry; Dunkerley, F. J.; DeWitt, B. J.

doi:10.1021/ja01244a030

Cited by 14 publications

(1 citation statement)

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“…in the temperature interval 500~176 are given in Table II and The equilibrium values in Table II were treated by means of Sigma functions and the method of least squares, using the value for ACp, to yield the following equations for this reaction: There is no literature value available for comparison, but it is reasonable since S~ of WO~ = 19.9 e.u. (26). The heat of formation of WO~ was also obtained by direct combustion technique.…”

Section: Resultsmentioning

confidence: 99%

Equilibrium Reduction of Tungsten Dioxide by Hydrogen

Griffis¹

1958

J. Electrochem. Soc.

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A study has been made of the heterogeneous equilibrium involving H2‐W‐WO2‐H2O in the temperature range 500°–1000°C, using a static equilibrium‐type of apparatus. The standard heat of formation and entropy of WO2 , as calculated from the equilibrium data, was found to be △H°=−135.0±0.3 normalkcal and 17.1±1.0 normale.normalu. The heats of formation of WO2 and the two higher suboxides were determined by direct combustion. △H°normalof W18O49 false(WO2.72false)=−183±1 normalkcal/normalmoleW,△H°normalof W20O58 false(WO2.90false)=−193±1 normalkcal/normalmoleW , and △H°normalof WO2=−137±1 normalkcal/normalmoleW .

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Section: Resultsmentioning

confidence: 99%