Thermodynamic characterization of hydrogen interaction with iridium polyhydride complexes
- Hawaii Natural Energy Institute, University of Hawaii at Manoa, Honolulu, Hawaii 96822 (United States)
Hydrogen interaction with solid iridium complexes IrXH{sub 2}(PPr3{sup i}){sub 2} (X=Cl, I) was investigated. Gaseous hydrogen was found to react reversibly with solid chloro-iridium complex IrClH{sub 2}(PPr3{sup i}){sub 2} forming IrClH{sub 2}(PPr3{sup i}){sub 2}H{sub 2}. The relative partial molal enthalpy and entropy were obtained from equilibrium isotherms at different hydrogen concentrations. The decrease in entropy with increasing hydrogen concentration and the absence of plateaus in the equilibrium isotherms were consistent with a single phase solid solution with two chemical components. Hydrogen release from solid iodo-iridium complex IrIH{sub 2}(PPr3{sup i}){sub 2}H{sub 2} was not observed at temperatures up to 350 K, indicating stronger hydrogen bonding. {copyright} {ital 1999 Materials Research Society.}
- OSTI ID:
- 324920
- Journal Information:
- Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 1 Vol. 14; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
40 CHEMISTRY
CHEMICAL PROPERTIES
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
DESORPTION
HYDROGEN
HYDROGEN COMPOUNDS
IODIDES
IODINE COMPOUNDS
IRIDIUM CHLORIDES
IRIDIUM COMPOUNDS
IRIDIUM HYDRIDES
ORGANOMETALLIC COMPOUNDS
SOLID SOLUTIONS
SORPTIVE PROPERTIES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES