摘要
以神华煤液化沥青(CLA)为碳源,针对其软化点高、芳香度高、碳含量高、容易聚合或交联的特点,采用700℃的高温喷雾法和KOH活化法,制备出比表面积超过2000m^(2)/g的球形活性炭。利用扫描电镜(SEM)、低温氮吸附仪(BET)、红外光谱仪(IR)、X射线衍射(XRD)和Raman光谱等多种手段对煤液化沥青、炭微球(SC)和球形活性炭(SAC)进行了表征测试。发现高温喷雾法可将雾化、成球、氧化不熔化和炭化过程一步完成,避免了常规制备工艺存在的成球温度低、微球在升温时易黏连、变形、破碎等难题,得到了具有球形形貌且相对均一结构与尺寸的活化前驱体。在KOH质量比1∶2、700℃活化90min的条件下,SC可生成比表面积2340m^(2)/g的球形活性炭SAC。在二电极电化学性能测试中,当电流密度从0.5A/g增大到20A/g时,比电容仅从243.36F/g降低到226.08F/g;在5A/g电流密度下循环10000圈后的容量基本保持不变。
In view of the characteristics of Shenhua coal liquefied asphalt(CLA),such as high softening point,high aromaticity,high carbon content and easy polymerization or cross-linking,spherical activated carbon with specific surface area over 2000 m^(2)/g was prepared by 700℃high temperature spray method and KOH activation method using CLA as carbon source.CLA,spherical carbon(SC)and spherical activated carbon(SAC)were characterized by scanning electron microscopy(SEM),low temperature nitrogen adsorption(BET),infrared spectroscopy(IR),X-ray diffraction(XRD)and Raman spectroscopy.It was found that the process of atomization,spheronization,non-melting oxidation and carbonization can be completed in one step by high temperature spray,avoiding the problems of low spheronization temperature,easy adhesion,deformation and crushing of microspheres when the temperature rises that occur in a conventional preparation process,thereby obtaining an activated precursor with spherical morphology and relatively uniform structure and size.Under condition that KOH is in a mass ratio of 1∶2 and activated for 90 mins at 700℃,SC can produce spherical activated carbon(SAC)with specific surface area of 2340 m^(2)/g.When the current density increased from 0.5 A/g to 20 A/g,the specific capacitance decreased from 243.36 F/g to 226.08 F/g in a two-electrode electrochemical performance test.The capacity remained unchanged after 10000 cycles at a current density of 5 A/g.
作者
辛凡文
高山松
郑伦
XIN Fan-wen;GAO Shan-song;ZHENG Lun(China Shenhua Coal to Liquid and Chemical Shanghai Research Institute,Shanghai 201108,China)
出处
《煤炭工程》
北大核心
2022年第11期177-181,共5页
Coal Engineering
关键词
碳基材料
球形活性炭
高温喷雾法
KOH活化法
煤液化沥青
carbon-based material
spherical activated carbon
high temperature spray
KOH activation
coal liquefied asphalt
作者简介
辛凡文(1986—),男,江苏徐州人,博士,高级工程师,研究方向:煤炭加工转化、煤液化残渣综合利用、洁净煤技术等,E-mail:xinfanwen@csclc.com。
