水蒸气活化兰炭粉制备多层次孔活性炭工艺优化及活化动力学研究  

Preparation of hierarchical porous carbons from semi-coke powder by steam activation: process optimization and activation kinetics analysis

作　　者：张曼妮 徐国忠[1] 吴红运[1] 高丽娟[1] 赵雪飞[1] 方志刚[1] 朱亚明[1] 

机构地区：[1]辽宁科技大学化工学院辽宁省先进煤焦化及煤质资源高效利用工程研究中心,辽宁鞍山114051

出　　处：《炭素技术》2017年第6期50-55,共6页Carbon Techniques

基　　金：国家自然科学基金(U13612051);辽宁省自然科学基金(20170540470);辽宁省教育厅基金(2017FWDF07);辽宁科技大学专项基金(601009816-30);辽宁科技大学重大科研平台开放课题(USTLKFZD 201638);大学生创新训练基金(DC2016117)

摘　　要：为拓展兰炭粉高附加值利用途径,研究了水蒸气活化兰炭粉制备活性炭的工艺优化、动力学和孔隙演变行为。利用氮气吸附仪分析活性炭的比表面积和孔径分布。研究结果表明:最佳的活化工艺条件下制备的活性炭的碘和亚甲基蓝吸附值以及比表面积分别为1 134.25 mg/g、257.06 mg/g和847 m^2/g,活性炭具有以中孔为主的多层孔特征。二氧化碳气化焦炭的混合模型能够精确拟合水蒸气活化兰炭粉的动力学,发现活化温度对活化速率和活性炭收率的影响极其显著。随着活化时间的延长,气孔的演变行为是微孔生成、微孔扩充、微孔坍塌变为中孔或大孔。In order to search a utilization way with additional value for semi-coke, semi-coke powder was activated by steam to prepare activated carbons in this work. Activation process was optimized by orthogonal experiment, and then, activation kinetics was studied, finally, the behavior evolution of pore was also explored with the progress of activation reaction. The pore size distribution and specific surface area of the activated carbon were analyzed by nitrogen adsorption-desorption isotherms. The results show that the absorption value of iodine and methylene blue, and BET surface area of activated carbon achieved to 1 134.25 mg-g-l, 257.06 mg-g-1 and 847 m2. g-I under the optimization process. The kinetics of steam activating semi-coke powder can be well fitted by the hybrid model which comes from the gasification reaction of CO2 and coke. Meanwhile, temperature can signally impact on activation rate and the yield of activated carbon. The behavior evolution of pore exhibits micropores generating and growth, and micropores col lapsing and translating gradually to mesopores or big pores with the activation time prolonging.

关 键 词：兰炭粉 活性炭 水蒸气活化法 碘吸附值 比表面积 

分 类 号：TQ424.1[化学工程]