Indirect, Reversible High-Density Hydrogen Storage in Compact Metal Ammine Salts.
The indirect hydrogen storage capabilities of Mg(NH)Cl, Ca(NH)Cl, Mn(NH)Cl, and Ni(NH)Cl are investigated. All four metal ammine chlorides can be compacted to solid tablets with densities of at least 95% of the crystal density. This gives very high indirect hydrogen densities both gravimetrically an...
| Publicado en: | Journal of the American Chemical Society Vol. 130; no. 27; pp. 8660 - 8669 |
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| Autores principales: | , , , , , , |
| Formato: | Artículo |
| Publicado: |
American Chemical Society
7/9/2008
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| Materias: | |
| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=hlh&AN=33155714&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 33155714 longDbName: Humanities International Complete uiTag: AN controlInfo: bkinfo: jinfo: jid: 00027863 ACS jtl: Journal of the American Chemical Society issn: 00027863 maglogo: N pubinfo: dt: 7/9/2008 vid: 130 iid: 27 pid: 997 pub: American Chemical Society artinfo: ui: 33155714 10.1021/ja076762c ppf: 8660 ppct: 9 formats: tig: atl: Indirect, Reversible High-Density Hydrogen Storage in Compact Metal Ammine Salts. aug: au: Sørensen, Rasmus Z. Hummelshej, Jens S. Kierke, Asbjørn Birke Reves, Jacob Vegge, Tejs Nerskov, Jens K. Christensen, Claus H. affil: Center for Sustainable and Green Chemistry, Department of Chemistry, Building 206, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark Center for Atomic-scale Materials Design, Department of Physics, Building 310, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark Materials Research Department, Ris∅ National Laboratory for Sustainable Energy, NanoDTU, Building 228, Technical University of Denmark, DK-4000 Roskilde, Denmark su: Hydrogen Chlorine compounds Chlorides Density functionals Heat transfer Functional analysis sug: subj: Hydrogen Chlorine compounds Chlorides Density functionals Heat transfer Functional analysis ab: The indirect hydrogen storage capabilities of Mg(NH)Cl, Ca(NH)Cl, Mn(NH)Cl, and Ni(NH)Cl are investigated. All four metal ammine chlorides can be compacted to solid tablets with densities of at least 95% of the crystal density. This gives very high indirect hydrogen densities both gravimetrically and volumetrically. Upon heating, NH is released from the salts, and by employing an appropriate catalyst, H can be released corresponding to up to 9.78 wt % H and 0.116 kg H/L for the Ca(NH)Cl salt. The NH release from all four salts is investigated using temperature-programmed desorption employing different heating rates. The desorption is found mainly to be limited by heat transfer, indicating that the desorption kinetics are extremely fast for all steps. During desorption from solid tablets of Mg(NH)Cl, Mn(NH)Cl, and Ni(NH)Cl, nanoporous structures develop, which facilitates desorption from the interior of large, compact tablets. Density functional theory calculations reproduce trends in desorption enthalpies for the systems studied, and a mechanism in which individual chains of the ammines are released from the surface of the crystal is proposed to explain the fast absorption/desorption processes. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: Y dt: @attributes: year: 2008 holdings: @attributes: islocal: N |
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