کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
73535 49063 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrogen adsorption properties of platinum decorated hierarchically structured templated carbons
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Hydrogen adsorption properties of platinum decorated hierarchically structured templated carbons
چکیده انگلیسی


• Hierarchically structured TC and Pt/TC were synthesized by microemulsion method.
• Pt free and decorated templated carbon (TC) exhibit identical textural properties.
• The catalytic effect of Pt (spillover) is studied by TDS after H2/D2 gas exposure.
• H2 adsorption kinetics in the microporous Pt/TC is strongly affected by spillover.

In this report, the possibility of Pt catalytic activity for the dissociation of hydrogen molecules and subsequent hydrogen adsorption on sucrose templated carbon at ambient temperature has been studied. In order to investigate Pt catalytic effect for hydrogen storage solely, 6.8 wt.% Pt-doped (Pt/TC) and pure templated carbon (TC) possessing almost identical specific surface area (SSA) and pore volume (Vp) have been successfully synthesized. Since both Pt/TC and TC shares for their textural properties (e.g. SSA and Vp), any difference of hydrogen adsorption characteristic and storage capacity can be ascribed to the presence of Pt nanoparticles. Both samples are characterized by various techniques such as powder X-ray diffraction, ICP-OES, Ranman spectroscopy, transmission electron microscopy, cryogenic thermal desorption spectroscopy, low-pressure high-resolution hydrogen and nitrogen BET and high-pressure hydrogen adsorption isotherms in a Sieverts’ apparatus. By applying hydrogen and deuterium isotope mixture, cryogenic thermal desorption spectroscopy point to a Pt catalytic activity for the dissociation of hydrogen molecules. Furthermore, the hydrogen adsorption isotherms at RT indicate an enhancement of the initial hydrogen adsorption kinetics in Pt-doped system. However, the hydrogen storage capacity of Pt/TC exhibits a negligible enhancement with a strong hysteresis, suggesting no connection between the spillover effect and a feasible hydrogen storage enhancement.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microporous and Mesoporous Materials - Volume 177, 1 September 2013, Pages 66–74
نویسندگان
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