水蒸气和KOH二次活化对活性炭孔隙结构的影响研究  

Impact of reactivation with steam and KOH on pore structure of activated carbon

作　　者：王泽兵 郭泽宇 张会涛 雷彭 安丽花 郭军军 Wang Zebing;Guo Zeyu;Zhang Huitao;Lei Peng;An Lihua;Guo Junjun(Shanxi Xinhua Chemical Defense Equipment Research Institute Co.,Ltd.,Taiyuan Shanxi 030008,China)

机构地区：[1]山西新华防化装备研究院有限公司,山西太原030008

出　　处：《煤化工》2023年第1期69-72,88,共5页Coal Chemical Industry

摘　　要：以商业活性炭为原料,采用水蒸气和KOH为活化剂,在不同活化条件下制备二次活化样品。用DFT方程考察活性炭孔径的变化;用FT-IR技术对活性炭表面官能团进行分析表征;采用XRD技术测试活性炭中的乱层结构。结果表明:无论何种活化方式,延长活化时间和提高活化温度,均有利于制备高比表面积且孔径发达的活性炭;化学二次活化较物理活化更易制得高比表面积且孔径发达的活性炭,且两种活化方式制备的活性炭的孔结构存在明显的差异;在适宜的条件下,KOH二次活化制备的活性炭在孔径<4.00 nm的范围内孔结构发达,孔径在4.00 nm~8.00 nm出现明显的分布峰,且石墨化结构破坏严重。A series of activated carbon samples in different activation conditions were prepared from commercial activated carbon by reactivation with steam and KOH.The pore size changes of activated carbon were analyzed by DFT pore size distribution model.The functional groups on the surface of activated carbon were analyzed and characterized by FT-IR spectroscopy.The disordered structure in activated carbon was studied with XRD technique.The results showed that whatever activation method was used,it was beneficial to prepare activated carbon with high specific surface area and well-developed pore size by means of prolonging activation time and raising activation temperature.Compared with reactivation with steam,activated carbon with high specific surface area and developed pore structure was more easily prepared by reactivation with KOH.The pore structures of activated carbons prepared by the two activation methods were obviously different.Under suitable conditions,the activated carbon reactivated with KOH had a well-developed pore structure when pore size was<4.00 nm,also it had an obvious distribution peak when pore size was in the range of 4.00 nm-8.00 nm.Moreover,the graphitized structure was seriously destroyed.

关 键 词：活性炭 二次活化 水蒸气 KOH 孔结构 

分 类 号：TQ424.1[化学工程]