不同煤体结构煤基活性炭微观结构与甲烷吸附性能  

Microstructure and methane adsorption of coal-based activated carbons with different coal body structures

作　　者：张小兵 郇璇 张航[1,3] 张玉贵[1,3] 

机构地区：[1]河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地,河南焦作454003 [2]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [3]河南理工大学安全科学与工程学院,河南焦作454003

出　　处：《中国矿业大学学报》2017年第1期155-161,共7页Journal of China University of Mining & Technology

基　　金：国家科技重大专项(2011ZX05040-005);国家自然科学基金项目(41102094);河南省高校科技创新团队支持计划项目(14IRTSTHN002)

摘　　要：为探索新型煤基甲烷存储材料前驱体,采用碱活化法制备并酸化改性获得构造煤基/非构造煤基系列活性炭,借助低温氮吸附、红外光谱、Boehm滴定等技术表征了不同煤体结构原煤和煤基活性炭结构参数,并考察了孔隙结构和表面酸性基团对其甲烷吸附行为的影响。结果表明:构造煤基系列活性炭的比表面积和孔体积均大于相应非构造煤基,其甲烷吸附能力也相对较强;酸化改性作用使得活性炭表面主要酸性基团量增加,在改变其比表面积和孔体积的同时却明显抑制了甲烷吸附能力。鉴于酸性基团对煤基活性炭-甲烷吸附的抑制作用强于孔隙结构的促进作用,基于甲烷存储材料开发的构造煤基活性炭制备中应慎重引入酸性基团。To explore a novel precursor for coal-based methane storage material, a series of coal-based activated carbons （ACs） were obtained from alkalinized activation and acid modifica- tion of tectonic coal and its symbiotic un-tectonic coal. Using microstructure-testing methods such as low-temperature nitrogen adsorption, fourier transform infrared spectra and Boehm ti- tration, the structure parameters of coals and coal-based ACs were characterized, then the in- fluence of pore structure and surface acidic groups on adsorption behavior of methane were i- dentified. The results show that the specific surface area and pore volume of each tectonic coal- based AC are greater than those of un-tectonic coal-based AC, and the methane-adsorption ca- pacity of tectonic coal-based ACs is relatively stronger. Acid modification increases the amount of main acidic groups on the surface of coal-based ACs, and simultaneously changes their spe- cific surface area and pore volume, yet the adsorption capacity is inhibited significantly. Theinhibitory effect of acid surface functional groups to coal-methane adsorption is stronger than the promoting effect of pore structure, suggesting that we should be careful when introducing acid surface functional groups into the preparation of tectonic coal-based ACs via methane stor- age materials development.

关 键 词：煤基活性炭 煤体结构 构造煤 酸化改性 微观结构 吸附行为 

分 类 号：TD849[矿业工程—煤矿开采]