期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 119, 期 1-3, 页码 53-59出版社
ELSEVIER
DOI: 10.1016/j.micromeso.2008.09.040
关键词
Activated carbon; Surface properties; Supercritical water; Gasification
类别
资金
- European Commission [MTKD-CT-2005-030040]
- ALFA program [LIGNOCARB-ALFA II 0412 FA FI]
- Catalan Regional Government [2005SGR-00580]
A charcoal prepared by pyrolyzing stones of awara, a nut from a common Guyanese palm tree, was physically activated with water according to two different procedures. Either superheated steam (SHS) at 600, 700 or 800 degrees C and atmospheric pressure, or supercritical water (SCW) at 600 degrees C and 250 or 350 bar, was used. The main characteristics of the resultant activated carbons were measured and compared: for that purpose, gasification rates, activation energy, pore texture parameters (surface area, micro- and mesopore volumes, average micropore width), and surface chemistry were investigated. It was found that, despite the corresponding lower temperature activation, SCW leads to a faster development of the microporosity at lower burn-off than in the case of conventional SHS. Nevertheless, the micropores produced by SCW activation are not narrower. Higher reaction times are required with SCW for obtaining a given burn-off, so a better control of porosity development may be achieved through the use of supercritical activation. Finally, not only the gasification kinetics is influenced by the state of the water: at similar Surface areas, more oxygenated functional groups are always created by SCW activation. (C) 2008 Elsevier Inc. All rights reserved.
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