Reactions in the SrH2-Al-H2 system

Q. A. Zhang; E. Akiba

doi:10.1016/j.jallcom.2007.06.004

Reactions in the SrH₂-Al-H₂ system

Q. A. Zhang, E. Akiba

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

The reactions in SrH₂-Al-H₂ system were studied by hydrogenation/dehydrogenation of the 2SrH₂ + Al mixture prepared by ball milling of Sr₂Al alloy under hydrogen. It was found that SrH₂ and Al can react with hydrogen to form Sr₂AlH₇ at 553 K when the hydrogen pressure is above 2.93 MPa and this reaction is reversible. The enthalpy change for the formation of Sr₂AlH₇ from SrH₂ + Al + H₂ is about -51 kJ/mol H₂. When the hydrogen pressure is below 1.76 MPa and the temperature is 553 K, however, SrH₂ reacts with Al to form SrAl₄ and H₂ with an enthalpy change of 48 kJ/mol H₂. This reaction is irreversible under the present experimental condition. Similarly, Sr₂AlH₇ also decomposes into SrH₂, SrAl₄ and H₂ when the hydrogen pressure is below the equilibrium pressure of the irreversible reaction.

Original language	English
Pages (from-to)	272-275
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	460
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2007.06.004
Publication status	Published - Jul 28 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.jallcom.2007.06.004

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title = "Reactions in the SrH2-Al-H2 system",

abstract = "The reactions in SrH2-Al-H2 system were studied by hydrogenation/dehydrogenation of the 2SrH2 + Al mixture prepared by ball milling of Sr2Al alloy under hydrogen. It was found that SrH2 and Al can react with hydrogen to form Sr2AlH7 at 553 K when the hydrogen pressure is above 2.93 MPa and this reaction is reversible. The enthalpy change for the formation of Sr2AlH7 from SrH2 + Al + H2 is about -51 kJ/mol H2. When the hydrogen pressure is below 1.76 MPa and the temperature is 553 K, however, SrH2 reacts with Al to form SrAl4 and H2 with an enthalpy change of 48 kJ/mol H2. This reaction is irreversible under the present experimental condition. Similarly, Sr2AlH7 also decomposes into SrH2, SrAl4 and H2 when the hydrogen pressure is below the equilibrium pressure of the irreversible reaction.",

author = "Zhang, {Q. A.} and E. Akiba",

note = "Funding Information: This work has been supported by New Energy and Industrial Technology Development Organization (NEDO) under “Development for Safe Utilization and Infrastructure of Hydrogen”. We would like to thank Mr. Changchun Wang of Anhui University of Technology of China for his measurements of P – C isotherms.",

year = "2008",

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doi = "10.1016/j.jallcom.2007.06.004",

language = "English",

volume = "460",

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journal = "Journal of Alloys and Compounds",

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T1 - Reactions in the SrH2-Al-H2 system

AU - Zhang, Q. A.

AU - Akiba, E.

N1 - Funding Information: This work has been supported by New Energy and Industrial Technology Development Organization (NEDO) under “Development for Safe Utilization and Infrastructure of Hydrogen”. We would like to thank Mr. Changchun Wang of Anhui University of Technology of China for his measurements of P – C isotherms.

PY - 2008/7/28

Y1 - 2008/7/28

N2 - The reactions in SrH2-Al-H2 system were studied by hydrogenation/dehydrogenation of the 2SrH2 + Al mixture prepared by ball milling of Sr2Al alloy under hydrogen. It was found that SrH2 and Al can react with hydrogen to form Sr2AlH7 at 553 K when the hydrogen pressure is above 2.93 MPa and this reaction is reversible. The enthalpy change for the formation of Sr2AlH7 from SrH2 + Al + H2 is about -51 kJ/mol H2. When the hydrogen pressure is below 1.76 MPa and the temperature is 553 K, however, SrH2 reacts with Al to form SrAl4 and H2 with an enthalpy change of 48 kJ/mol H2. This reaction is irreversible under the present experimental condition. Similarly, Sr2AlH7 also decomposes into SrH2, SrAl4 and H2 when the hydrogen pressure is below the equilibrium pressure of the irreversible reaction.

AB - The reactions in SrH2-Al-H2 system were studied by hydrogenation/dehydrogenation of the 2SrH2 + Al mixture prepared by ball milling of Sr2Al alloy under hydrogen. It was found that SrH2 and Al can react with hydrogen to form Sr2AlH7 at 553 K when the hydrogen pressure is above 2.93 MPa and this reaction is reversible. The enthalpy change for the formation of Sr2AlH7 from SrH2 + Al + H2 is about -51 kJ/mol H2. When the hydrogen pressure is below 1.76 MPa and the temperature is 553 K, however, SrH2 reacts with Al to form SrAl4 and H2 with an enthalpy change of 48 kJ/mol H2. This reaction is irreversible under the present experimental condition. Similarly, Sr2AlH7 also decomposes into SrH2, SrAl4 and H2 when the hydrogen pressure is below the equilibrium pressure of the irreversible reaction.

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DO - 10.1016/j.jallcom.2007.06.004

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SN - 0925-8388

VL - 460

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EP - 275

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 1-2

ER -

Reactions in the SrH₂-Al-H₂ system

Abstract

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