کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1558585 | 999313 | 2007 | 7 صفحه PDF | دانلود رایگان |
A series of activated carbons was prepared using a two-step activation process. The starting glass-like carbon spheres were heated at 500°C for 3 h (first step activation), and then at a low temperature, below 415°C, for different times (second step activation), in a flow of dry air. Their pore structures were evaluated from N2 gas adsorption/desorption isotherms at 77K by BET, αs-plot and BJH methods. The first step of activation generated a few large pores (mesopores and even macropores), on the surface of the spheres, which formed the entrance for the activating reagent gas (air), to increase micropores at a low temperature in the second step of activation. This two-step activation process was found to be an efficient approach to get a comparatively high surface area and a volume of micropores with a high activation yield.
Journal: New Carbon Materials - Volume 22, Issue 2, June 2007, Pages 102-108