期刊
CARBON
卷 47, 期 4, 页码 1012-1017出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2008.12.001
关键词
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资金
- Fundacao para a Ciencia e a Tecnologia [SFRH/BPD/20535/2004]
- European Commission [ALFA-II-0412-FAFI]
Demineralised kraft lignin was impregnated with between 6.2% and 50% NaCl or KCl and physically activated in CO2 at 750 degrees C. The results presented show that a considerable reduction in activation time even at a comparatively low activation temperature could be achieved, particularly when using KCl. Considering a fixed level of burn-off, the impregnation did not affect the pore volume and only increased the pore width by about 0.1-0.2 nm, depending on the concentration of NaCl or KCl used. By controlling the conditions it was possible to obtain predominantly ultra microporous materials with mean pore widths over the range 0.53-0.77 nm. on the other hand, at high levels of burn-off, there was evidence for micropore widening into the small mesopore range and also for the formation of a secondary mesopore structure. Under these conditions it was possible to obtain materials with pore volumes as high as 0.82 cm(3) g(-1). (C) 2008 Elsevier Ltd. All rights reserved.
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