以重质沥青为原料,采用空气热聚合法-物理活化法协同制备重质沥青基活性炭。通过正交设计法系统研究了预氧化升温速率、恒温温度、恒温时间、活化时间、活化温度、炭化时间、炭化温度等因素对重质沥青基活性炭的影响。利用扫描电镜、碘吸附值等对活性炭的表面形态及吸附特性进行表征。结果表明,空气热聚合法-物理活化法协同制备重质沥青基活性炭的优化条件为:预氧化升温速率为2℃/min、预氧化恒温温度为300℃、预氧化恒温时间为1 h、炭化温度为500℃、炭化时间为120 min、活化温度为850℃、活化时间为90 min,该工艺条件下制备的活性炭具有较为发达的微孔结构,碘吸附值为689.33 mg/g。

Heavy asphalt-based activated carbon is prepared by means of air thermal polymerization-physical activation method with heavy asphalt as feedstock.The influences of seven factors on heavy asphalt based activated carbon are studied via orthogonal design method,which including the heating rate,constant temperature,and constant temperature time in pre-oxidation stage,activation time,activation temperature,carbonization time and carbonization temperature.The surface morphology and adsorption characteristics of heavy asphalt-based activated carbon are characterized by means of SEM and iodine adsorption value.The optimal preparation conditions for heavy bitumen-based activated carbon by air thermal polymerization-physical activation method are obtained as follows:the temperature increasing rate,constant temperature and constant temperature time are 2℃·min^-1,300℃ and 1 h,respectively in the stage of pre-oxidation,carbonization temperature is 500℃,carbonization time is 120 min,activation temperature is 850℃,and activation time is 90 min.The activated carbon prepared under these conditions has a relatively developed micropore structure,with an iodine adsorption value of 689.33 mg·g^-1.

刘洋(1996-),女,硕士研究生,研究方向为煤炭清洁利用,S20190679@stu.tyust.edu.cn