中孔分布活性炭的制备与表征  

PREPARATION AND ACTIVATION MECHANISM OF MESOPORE SIZE DISTRIBUTION OF ACTIVATED CARBON

作　　者：杨鑫[1] 童仕唐[1] 陈东东[1] 万柳[1] 沈仕德[1] 

机构地区：[1]武汉科技大学化学工程与技术学院,武汉430081

出　　处：《炭素》2012年第3期29-34,共6页Carbon

基　　金：国家自然科学基金（51174150）

摘　　要：以酚醛树脂为前驱体，纳米SiO2为模板剂，采用模板炭化和钾碱活化工艺研制中孔率较高、比表面积较大的中孔炭（Mesoporous carbon，MC），考察了活化温度、活化时间、树脂模板比等工艺参数对活性炭孔结构的影响。测试了活性炭N2的吸附等温线、孔径分布、比表面积，并通过扫描电子显微镜观察其微观结构。结果表明，较优工艺条件为：树脂模板比为2：1、活化温度850℃、活化时间3h，该条件下所得中孔炭中孔率达91．4％，比表面积为1501m^2·g^-1，总孔孔容1．38m^2·g^-1，为理想的窄孔径分布活性炭。Activated carbon with a high mesoporosity and a high surface area was prepared by formation of the template imprinted carbonization and potash developed activation process by using phenolic resin as a carbon precursor and nano-silica as a template. The influences of activation temperature, activation time and resin template proportion on the adsorption capacity were investigated. Nitrogen adsorption isotherms at -196℃, pore size distribution, surface area of mesoporous activated carbon were measured. Scanning electron microscopy was chosen to characterize the obtained activated carbon＇s microstructure. The results show that the optimal preparation conditions for mesoporous activated carbon is resin to template ratio of 2：1, activation temperature of 850℃, the activation time for 3h. The prepared mesoporous activated carbon using above conditions contains a high mesoporosity of 91.4%, total volume of 1.38 cm3/g, and specific surface area of 1 501 m2/g. It＇s a perfect activated carbon for the ideal narrow pore.

关 键 词：模板法 纳米SIO2 中孔炭 KOH活化 

分 类 号：TQ424.1[化学工程]