کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
208146 | 461240 | 2009 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: HEMP-derived activated carbon fibers by chemical activation with phosphoric acid HEMP-derived activated carbon fibers by chemical activation with phosphoric acid](/preview/png/208146.png)
Activated carbon fibers were prepared by chemical activation of hemp fibers with phosphoric acid at different carbonization temperatures and impregnation ratios. Surface properties of the activated carbons fibers were significantly influenced by the activation temperature and the impregnation ratio. An increase of either of these parameters produced a high development of the porous structure of the fibers. Activated carbon fibers with apparent surface area of 1350 m2/g and mesopore volume of 1.25 cm3/g were obtained at 550 °C with an impregnation ratio of 3. The activated carbon fibers presented a high oxidation resistance, due to the presence of phosphorus compounds on the carbon surface. The oxidation resistance results suggest that C–O–PO3 and mainly C–PO3 and C–P groups act as a physical barrier, blocking the active carbon sites for the oxidation reaction.
Journal: Fuel - Volume 88, Issue 1, January 2009, Pages 19–26