Mechanism of heterogeneous adsorption in the storage of hydrogen in carbon fibers activated with supercritical water and steam

被引:12
|
作者
Salvador, F. [1 ]
Montero, J. [1 ]
Sanchez-Montero, M. J. [1 ]
Izquierdo, C. [1 ]
机构
[1] Univ Salamanca, Dpto Quim Fis, Fac Ciencias Quim, Salamanca 37006, Spain
关键词
H-2; storage; Multisite Langmuir model; Activated carbon fibers; Supercritical water; PORE-SIZE DISTRIBUTION; POROUS CARBONS; CAPACITY; NANOTUBES; PHYSISORPTION; TEMPERATURE; NANOFIBERS; METHANE; NANOSTRUCTURES; BEHAVIORS;
D O I
10.1016/j.ijhydene.2011.03.079
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In the present work we study the capacity of storage hydrogen on carbon fibers activated with supercritical water and with steam on the basis of a multisite Langmuir model, with three energetically different adsorption sites that may be associated with pores of different sizes: i) very small micropores, accessible only to hydrogen; ii) micropores detected by the adsorption of CO2, and iii) micropores detected by the adsorption of N-2. The correlation of the experimental data with the model allowed the amount of hydrogen stored in each of the sites to be quantified and confirmed that hydrogen storage mechanism begins with the filling of the smallest pores. Additionally, from the model it was possible to interpret the dependence of the amount of hydrogen stored with textural parameters such as the micropore volumes. The model also allowed the storage capacity of the fibers to be predicted for pressures higher than those obtained experimentally. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:7567 / 7579
页数:13
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