کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
58712 47165 2007 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The role of vacancies in the hydrogen storage properties of Prussian blue analogues
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
The role of vacancies in the hydrogen storage properties of Prussian blue analogues
چکیده انگلیسی

The porosity and hydrogen storage properties of the dehydrated Prussian blue type solids Ga[Co(CN)6], Fe4[Fe(CN)6]3, M2[Fe(CN)6] (M = Mn, Co, Ni, Cu), and Co3[Co(CN)5]2 are reported and compared to those of M3[Co(CN)6]2 (M = Mn, Fe, Co, Ni, Cu, Zn). Nitrogen sorption measurements suggest partial framework collapse for M2[Fe(CN)6] (M = Co, Ni) and Co3[Co(CN)5]2, and complete collapse for Mn2[Fe(CN)6]. Hydrogen sorption isotherms measured at 77 K reveal a correlation between uptake capacity and the concentration of framework vacancies, with Langmuir–Freundlich fits predicting saturation values of 1.4 wt.% for Ga[Co(CN)6], 1.6 wt.% for Fe4[Fe(CN)6]3, 2.1 wt.% for Cu3[Co(CN)6]2, and 2.3 wt.% for Cu2[Fe(CN)6]. Enthalpies of H2 adsorption were calculated from isotherms measured at 77 and 87 K. Importantly, the values obtained for compounds with framework vacancies are not significantly greater than for the fully-occupied framework of Ga[Co(CN)6] (6.3–6.9 kJ/mol). This suggests that the exposed metal coordination sites in these materials do not dominate the hydrogen binding interaction.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volume 120, Issues 3–4, 28 February 2007, Pages 311–316
نویسندگان
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