H Storage Materials (22KJ/mol) Using Organometallic Ti Fragments as σ-H2 Binding Sites.
Low-coordinate Ti (III) fragments with controlled geometries designed specifically for σ-H binding were grafted onto mesoporous silica using tri- and tetrabenzyl Ti precursors. The hydrogen storage capacity was tested as a function of precursor and precursor loading level. At an optimal loading leve...
| Publicado en: | Journal of the American Chemical Society Vol. 130; no. 22; pp. 6992 - 7000 |
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| Autores principales: | , , |
| Formato: | Artículo |
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American Chemical Society
6/4/2008
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| 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=32553670&site=ehost-live header: @attributes: shortDbName: hlh uiTerm: 32553670 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: 6/4/2008 vid: 130 iid: 22 pid: 997 pub: American Chemical Society artinfo: ui: 32553670 10.1021/ja710288g ppf: 6992 ppct: 8 formats: tig: atl: H Storage Materials (22KJ/mol) Using Organometallic Ti Fragments as σ-H2 Binding Sites. aug: au: Hamaed, Ahmad Trudeau, Michet Antonelli, David M. affil: Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario N9B 3P4, Canada Chemistry and Materials, Hydro-Québec Research Institute, Varennes, Quebec, J3X 151, Canada su: Organometallic compounds Titanium compounds Hydrogen Adsorption (Chemistry) Chemistry sug: subj: Organometallic compounds Titanium compounds Hydrogen Adsorption (Chemistry) Chemistry ab: Low-coordinate Ti (III) fragments with controlled geometries designed specifically for σ-H binding were grafted onto mesoporous silica using tri- and tetrabenzyl Ti precursors. The hydrogen storage capacity was tested as a function of precursor and precursor loading level. At an optimal loading level of 0.2 mol equiv tetrabenzyl Ti the total storage capacity at -196 °C was 21.45 wt % and 34.10 kg/m³ at 100 atm, and 3.15 wt % and 54.49 kg/m³ for a compressed pellet under the same conditions. The adsorption value of this material was 1.66 wt %, which equates to an average of 2.7 H per Ti center. The adsorption isotherms did not reach saturation at 60 atm, suggesting that the theoretical maximum of 5 H per Ti in this system may be reached at higher pressures. The binding enthalpies rose with surface coverage to a maximum of 22.15 kJ/rnol, which is more than double that of the highest recorded previously and within the range predicted for room temperature performance. The adsorption values of 0.99 at -78 °C and 0.69 at 25 °C demonstrate retention of 2.4 H and 1.1 H per Ti at these temperatures, respectively. These findings suggest that Kubas binding of H may be exploited at ambient temperature to enhance the storage capacities of high-pressure cylinders currently used in hydrogen test vehicles. 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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