Effects of textural and surface characteristics of microporous activated carbons on the methane adsorption capacity at high pressures

被引:82
作者
Bastos-Neto, M.
Canabrava, D. V.
Torres, A. E. B.
Rodriguez-Castellon, E.
Jimenez-Lopez, A.
Azevedo, D. C. S.
Cavalcante, C. L., Jr.
机构
[1] Univ Fed Ceara, Dept Engn Quim, GPSA, BR-60455760 Fortaleza, Ceara, Brazil
[2] Univ Malaga, Fac Ciencias, Unidad Asociada ICP,CSIC, Dept Quim Inorgan Cristalog & Mineral, E-29071 Malaga, Spain
关键词
surface chemistry; methane adsorption; adsorbent;
D O I
10.1016/j.apsusc.2006.12.056
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
The objective of this study is to relate textural and surface characteristics of selected microporous activated carbons to their methane storage capacity. In this work, a magnetic suspension balance (Rubotherm, Germany) was used to measure methane adsorption isotherms of several activated carbon samples. Textural characteristics were assessed by nitrogen adsorption on a regular surface area analyzer (Autosorb-MP, by Quantachrome, USA). N-2 adsorption was analysed by conventional models (BET, DR, HK) and by Monte Carlo molecular simulations. Elemental and surface analyses were performed by X-ray photoelectronic spectroscopy (XPS) for the selected samples. A comparative analysis was then carried out with the purpose of defining some correlation among the variables under study. For the system under study, pore size distribution and micropore volume seem to be a determining factor as long as the solid surface is perfectly hydrophobic. It was concluded that the textural parameters per se do not unequivocally determine natural gas storage capacities. Surface chemistry and methane adsorption equilibria must be taken into account in the decision-making process of choosing an adsorbent for gas storage. (c) 2007 Elsevier B.V. All rights resered.
引用
收藏
页码:5721 / 5725
页数:5
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