| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 690820 | Journal of the Taiwan Institute of Chemical Engineers | 2015 | 8 Pages |
•Euphorbia rigida was pyrolyzed in a fixed bed reactor.•Char was then subjected to chemical impregnation and further thermal treatment.•Structure and characteristics of porous carbons were determined.•Chemical treatment greatly influenced the surface properties.•Micro–meso porous carbons were obtained from K2CO3, KOH and HCl impregnation.
This study deals with the structural and morphological changes occurring during pyrolysis and activation steps for the production of porous carbons from an arid-land plant Euphorbia rigida. A fixed-bed retort was used for slow pyrolysis and for further activation processes. Effect of pyrolysis atmosphere was examined at 550 °C and char yields were calculated to be 22.6, 23.1 and 17.5% under static, nitrogen and steam atmospheres respectively. Solid product obtained under static atmosphere was then impregnated with different chemicals (HCl, KOH, K2CO3, H2SO4, H3PO4, NaOH, ZnCl2) and a second thermal treatment was applied under different activation atmospheres. It was observed that the impregnation material, impregnation ratio and activation technique showed a strong influence on the yield and porous texture of the resulting carbons. On the basis of BET surface areas, most effective chemical agent was selected as K2CO3 giving a specific surface area of 1079 m2/g and microspore volume of 0.443 cm3/g. The physical–chemical properties of the chars and activated carbons were investigated by proximate and ultimate analyses, FT-IR, SEM, EDX, XRD and iodine number. In addition, surface functional groups were classified by Boehm titration method. Results suggest that chemical activation of E. rigida char produces valuable activated carbons under proper conditions.
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