Thermodynamic properties of metal amides determined by ammonia pressure-composition isotherms
Journal of Chemical Thermodynamics Volume 42 Issue 1
Page 140-143
published_at 2010-01
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| File | |
| Title ( eng ) |
Thermodynamic properties of metal amides determined by ammonia pressure-composition isotherms
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| Creator |
Hino Satoshi
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| Source Title |
Journal of Chemical Thermodynamics
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| Volume | 42 |
| Issue | 1 |
| Start Page | 140 |
| End Page | 143 |
| Abstract |
Thermodynamic properties of Mg(NH2)(2) and LiNH2 were investigated by measurements of NH3 pressure-composition isotherms (PCI). Van't Hoff plot of plateau pressures of PCI for decomposition of Mg(NH2)(2) indicated the standard enthalpy and entropy change of the reactions were Delta H degrees = (120 +/- 11) kJ . mol(-1) (per unit amount of NH3) and Delta S degrees= (182 +/- 19) J . mol(-1) . K-1 for the reaction: Mg(NH2)(2) -> MgNH +NH3, and Delta H degrees= 112 kJ . mol(-1) and Delta S degrees = 157 J . mol(-1) K-1 for the reaction: MgNH -> (1/3)Mg3N2 + (1/3)NH3. PCI measurements for formation of LiNH2 were carried out, and temperature dependence of plateau pressures indicated Delta H degrees = (-108 +/- 15) kJ . mol(-1) and Delta S degrees = (-143 +/- 25) J. mol(-1) . K-1 for the reaction: Li2NH + NH3 -> 2LiNH(2).
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| Keywords |
Hydrogen storage materials
Pressure-composition isotherms
Gas-solid reactions
Van't Hoff plot
Heat of formation
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| NDC |
Chemistry [ 430 ]
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
Academic Press LTD
Elsevier Science LTD
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| Date of Issued | 2010-01 |
| Rights |
Copyright (c) 2009 Elsevier Ltd.
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| Publish Type | Author’s Original |
| Access Rights | open access |
| Source Identifier |
[ISSN] 0021-9614
[DOI] 10.1016/j.jct.2009.07.024
[NCID] AA00695156
[DOI] http://dx.doi.org/10.1016/j.jct.2009.07.024
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