Tham khảo tài liệu 'progress in biomass and bioenergy production part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Characterization of Activated Carbons Produced from Oleaster Stones 259 P P0 P P0 Fig. 5. Nitrogen adsorption isotherms Surface area Figure 6 illustrates variations in BET and micropore surface areas of activated carbons produced under three different activation conditions and at three different temperatures. The graph shows that BET and micropore surface areas exhibit variations depending on the activation method and temperature. 260 Progress in Biomass and Bioenergy Production Fig. 6. Variations in BET and micropore surface areas in relation to activation method and temperature The highest BET and micropore surface area were achieved at a carbonization temperature of 650 C through the production of activated carbons by chemical activation. Activated carbons PH650 CH650 and CHPH650 were found to have BET values of 53 m2 g 830 m2 g and 707 m2 g respectively. The micropore surface areas of activated carbons PH650 CH650 and CHPH650 were established to be 0 m2 g 765 m2 g and 650 m2 g respectively. The BET surface area for PH650 obtained was found to be low and no pores were observed in the microstructure. It can be stated that physical activation is not effective at this carbonization temperature but chemical activation is suitable. The micropore percentage of activated carbons produced through chemical and sequential activation is 92 . It was found that activated carbons obtained at 750 C have a comparatively higher surface area than those produced at 650 C. The BET values of activated carbons PH750 CH750 and CHPH750 were determined to be 447 m2 g 1084 m2 g and 1733 m2 g respectively. The same activated carbons were found to have micropore surface areas of 356 m2 g 1008 m2 g Characterization of Activated Carbons Produced from Oleaster Stones 261 and 1254 m2 g respectively. The percentage of the micropore surface area for PH750 CH750 and CHPH750 were established to be 79 93 and 72 respectively. It is clear that the chemical and sequential methods at the same .
