首页|Thermal treatment of anhydrous chromium (III) chloride: Thermodynamic study
Thermal treatment of anhydrous chromium (III) chloride: Thermodynamic study
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NSTL
Elsevier
Anhydrous CrCl3 center dot epsilon H2O exhibited, under helium stream (6 L h-1, 5 K min(-1)), several transformations between room temperature and (1175 +/- 2) K. The compound loses the physisorbed water molecules between (300 +/- 2) K and (400 +/- 2) K and the hydration degree (e) was determined by thermogravimetry to be 0.14. However, using mass spectrometry, we were able to detect the transformation of CrCl3(cr) into CrCl3(g) at T = (776.00 +/- 0.01) K. In this context, Delta H-sub (776 K) value was estimated using some literature data and the Clausius-Clapeyron relation to be (245.20 +/- 0.01) kJ mol(-1). This value was corrected at (298.15 +/- 0.01) K and (0.105 +/- 0.01) MPa, resulting in (254.93 +/- 0.01) kJ mol(-1). Our thermodynamic calculations revealed that CrCl3(g) is decomposed into CrCl2(cr) and Cl-2(g) within two distinct temperature ranges: (776 +/- 2) to (860 +/- 2) K and (950 +/- 2) K to (1050 +/- 2) K. Between (860 +/- 2) and (950 +/- 2) K, the evaporation of CrCl2(cr) in the form of CrCl4(g) takes place due to the presence of Cl-2(g). However, at higher temperatures (T > 1050 K), residual CrCl2(cr) is evaporated and a final mass loss of 94 % is obtained.
NSTL
Elsevier
