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Hydrogenation Thermodynamics of Ti 16 V 60 Cr 24−x Fe x Alloys (x = 0, 4, 8, 12, 16, 20, 24).
- Source :
- Hydrogen; Mar2024, Vol. 5 Issue 1, p29-38, 10p
- Publication Year :
- 2024
-
Abstract
- The effect of the partial substitution of Cr with Fe on the thermodynamic parameters of vanadium-rich Ti<subscript>16</subscript>V<subscript>60</subscript>Cr<subscript>24-x</subscript>Fe<subscript>x</subscript> alloys (x = 0, 4, 8, 12, 16, 20, 24) was investigated. For each composition, a pressure–concentration isotherm (PCI) was registered at 298, 308, and 323 K. The PCI curves revealed a reduction in plateau pressure and a decrease in desorbed hydrogen capacity with an increasing amount of Fe. For all alloys, about 50% or less of the initial hydrogen capacity was desorbed for all chosen temperatures. Entropy (ΔS) and enthalpy (ΔH) values were deducted from corresponding Van't Hoff plots of the PCI curves: the entropy values ranged from −150 to −57 J/K·mol H<subscript>2</subscript>, while the enthalpy values ranged from −44 to −21 kJ/mol H<subscript>2</subscript>. They both decreased with an increasing amount of Fe. Plotting ΔS as function of ΔH showed a linear variation that seems to indicate an enthalpy–entropy compensation. Moreover, a quality factor analysis demonstrated that the present relationship between entropy and enthalpy is not of a statistical origin at the 99% confidence level. [ABSTRACT FROM AUTHOR]
- Subjects :
- THERMODYNAMICS
HYDROGENATION
QUALITY factor
ENTHALPY
FACTOR analysis
Subjects
Details
- Language :
- English
- ISSN :
- 26734141
- Volume :
- 5
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Hydrogen
- Publication Type :
- Academic Journal
- Accession number :
- 176328905
- Full Text :
- https://doi.org/10.3390/hydrogen5010003