【摘要】 以木屑为原料,不添加任何黏结剂,使用H3PO4作为活化剂,制备高孔隙的成型活性炭。利用N2吸附-脱附、XRD及万能试验机,考察了不同活化时间(1~3 h)、活化温度(500~700℃)对成型活性炭性能的影响。结果表明:制备的成型活性炭具有较高的比表面积、孔隙率、得率、表观密度、耐压强度和总孔容积。在活化温度为600℃,活化时间为1 h的条件下,其比表面积达1 022.6 m2/g,得率为32.2%,表观密度为0.62 g/cm3,耐压强度为5.23 MPa,总孔容积为0.49 cm3/g,微孔比例达到91.8%。通过Doehlert设计法对反应条件进行优化,结果表明优化的制备条件为活化温度590℃,活化时间2.1 h,此时成型活性炭得率、耐压强度和表观密度分别为31.8%、5.54 MPa、0.87 g/cm3。理论值和实验值存在很好的一致性,表明该理论模型是可靠的。更多还原

【Abstract】 Sawdust was used as precursor to prepare binderless high porosities active carbon monoliths( ACMs) with H3 PO4 as activator and without binder. The influences of temperature( 500-700 ℃) and activation time( 1-3 h) on the properties of ACMs were analyzed by N2 adsorption-desorption,X-ray diffraction( XRD) and compression test. The results showed that the ACMs had high specific surface area,porosity,yield,apparent density,compressive strength and total pore volume and they could reach 1022. 6 m2/g,32. 2 %,0. 62 g/cm3,5. 23 MPa,0. 49 cm3/g and 91. 8 % when the activation temperature was 600 ℃ and the activation time was 1 h. The Doehlert matrix method was used to optimize the reaction conditions and the optimal temperature and time were 590 ℃ and 2. 1 h. Under these conditions the yield,compressive strength and density of ACMs were 31. 8%,5. 54 MPa and 0. 87 g/cm3. It was found that the theoretical value was consistent with experimental value and the theoretical model was reliable.更多还原