摘要
利用 XPS等分析手段对在电加热转炉上不同活化时间下制得的活性焦性质进行了研究 .结果表明 ,制得的活性焦比表面积、微孔孔容随活化时间增加而增加 .在活化初期 ,活性焦孔隙的发展以微孔为主 ,随着活化时间的延长 ,孔隙结构的发展表现为微孔生成与已有孔隙扩孔并存 .随着活化时间的延长 ,活性焦表面碱性位数量增加 ,但其表面 O/ C比降低 ,离域 π电子 ( Cπ)趋于活跃 ,碳平面层上的离域 π电子 ( Cπ)的电子给体 -受体相互作用是活性焦表面碱性的主要来源 .
Activating time effects significantly the characteristics of active cokes prepared from coal derived char by steam activation. The active cokes for different activating time were investigated using XPS and other methods. The experimental results show that the surface area and micropore area of the active coke increases with activating time. And the ratio of micropore area to surface area increases too. At the earlier stages of activation, the micro porous structure is mainly developed. With the activation time goes on, the micro porous structure is developed in the form of forming the micro pores and widening the already formed pores; and the surface basicity of active coke also increases. The quantity of oxygen on the surface of active coke decreases and the activity of delocalized π electron in the graphene layers of active coke become stronger. So the surface basicity of the active coke is mainly ascribed to the delocalized π electron in the graphene layers.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2003年第3期289-292,303,共5页
Journal of China University of Mining & Technology
基金
国家重大基础研究规划项目 ( G19990 2 2 2 0 4)
国家十五科技攻关项目 ( 2 0 0 1BA40 1A0 3 )
