氢氧化钾活化石油焦制备高比表面积活性炭

摘要

In this paper,a series of activated carbons with high specific surface area were prepared by using KOH as an activation agent and delayed petroleum coke as raw material.The effect of KOH/Coke ratio,activation temperature and activation time on the yield and iodine adsorption value was investigated by orthogonal test and further single factor experiments.The results indicated that the significant factor for iodine adsorption value was KOH/coke ratio.The iodine adsorption capacity can be improved by increasing KOH/coke ratio,extending the activation time and selecting the appropriate activation temperature.A activated carbon sample with specific surface area of 2775 m2/g and total pore volume of 2.888 cm3/g was prepared under the conditions of KOH/coke ratio 4∶1,activation temperature 750 ℃ and activation duration 120 min,respectively.%研究了以石油焦为原料,用氢氧化钾为活化剂制备高比表面积活性炭方法。通过正交实验与进一步的单因素实验考察了碱焦比、活化温度和活化时间对活性炭碘吸附值和活化收率的影响。实验结果表明碱焦比对活性炭碘吸附值影响最显著,增大碱焦比、延长活化时间和选择合适的活化温度能提高碘吸附能力。在碱焦比为4∶1,活化温度750℃和活化时间120 min条件下制备的活性炭BET比表面积可达2775 m2/g,总孔容为2.888 cm3/g。