کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1417556 985973 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Using alkali metals to control reactivity and porosity during physical activation of demineralised kraft lignin
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
پیش نمایش صفحه اول مقاله
Using alkali metals to control reactivity and porosity during physical activation of demineralised kraft lignin
چکیده انگلیسی
Demineralised kraft lignin was impregnated with between 6.2% and 50% NaCl or KCl and physically activated in CO2 at 750 °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 ultramicroporous 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 cm3 g−1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 47, Issue 4, April 2009, Pages 1012-1017
نویسندگان
, , ,