Characterization of porous texture in composite adsorbents based on exfoliated graphite and polyfurfuryl alcohol

被引:13
作者
Suárez-García, F
Martínez-Alonso, A
Tascón, JMD
Ruffine, L
Furdin, G
Marêché, JF
Celzard, A
机构
[1] CSIC, Inst Nacl Carbon, E-33080 Oviedo, Spain
[2] Univ Henri Poincare, UMR CNRS 7555, Lab Chim Solide Mineral, F-54506 Vandoeuvre Les Nancy, France
关键词
activated carbon; expanded graphite; adsorption; porosity;
D O I
10.1016/S0378-3820(02)00088-7
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Composite activated carbon monoliths were prepared from polyfurfuryl alcohol-impregnated compressed expanded graphite (CEG) blocks by pyrolysis at 923 K followed by steam activation at 1073 K. The porous texture of these materials was analysed from physical adsorption measurements of N-2 at 77 K and CO2 at 273 K. Pyrolysis gives rise to a nitrogen surface area higher than for many conventional carbonised precursors of active carbons. Activation develops even more the porosity. At low burn-offs, there is principally creation of new pores (including ultramicropores). At higher burn-offs (of the order of 40%). opening of preexisting pores takes place. The materials obtained are essentially microporous and exhibit a rather narrow pore size distribution. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:401 / 407
页数:7
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