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Activated Carbon Fibre Monoliths for Hydrogen Storage

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Abstract:

Porous adsorbents are currently investigated for hydrogen storage application. From a practical point of view, in addition to high porosity developments, high material densities are required, in order to confine as much material as possible in a tank device. In this study, we use different measured sample densities (tap, packing, compacted and monolith) for analyzing the hydrogen adsorption behavior of activated carbon fibres (ACFs) and activated carbon nanofibres (ACNFs) which were prepared by KOH and CO2 activations, respectively. Hydrogen adsorption isotherms are measured for all of the adsorbents at room temperature and under high pressures (up to 20 MPa). The obtained results confirm that (i) gravimetric H2 adsorption is directly related to the porosity of the adsorbent, (ii) volumetric H2 adsorption depends on the adsorbent porosity and importantly also on the material density, (iii) the density of the adsorbent can be improved by packing the original adsorbents under mechanical pressure or synthesizing monoliths from them, (iv) both ways (packing under pressure or preparing monoliths) considerably improve the storage capacity of the starting adsorbents, and (v) the preparation of monoliths, in addition to avoid engineering constrains of packing under mechanical pressure, has the advantage of providing high mechanical resistance and easy handling of the adsorbent.

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Periodical:

Advances in Science and Technology (Volume 93)

Pages:

102-111

DOI:

https://doi.org/10.4028/www.scientific.net/AST.93.102

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Online since:

October 2014

Authors:

Mirko Kunowsky, Juan Pablo Marco-Lozar, Ángel Linares-Solano*

Keywords:

Activated Carbon, Adsorption, Density, Hydrogen Storage, Porous Adsorbents

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© 2014 Trans Tech Publications Ltd. All Rights Reserved

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