固定碳对煤的孔结构和甲烷吸附量的影响  

Influence of fixed carbon on coal textural character and methane adsorption capacity

作　　者：郝世雄[1,2] 王承洋[1] 江成发[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]四川理工学院材料与化学工程学院,四川自贡643000

出　　处：《煤炭学报》2012年第9期1477-1482,共6页Journal of China Coal Society

基　　金：国家重点基础研究发展计划(973)资助项目(2011CB201202)

摘　　要：以4种不同固定碳质量分数的煤样作为研究对象,采用SEM表征其形貌,采用77 K时的N2吸脱附实验测定其比表面积、孔容和孔径分布,容量法测定其吸附甲烷的性能,并讨论煤的固定碳质量分数对其比表面积、孔容和吸附甲烷能力的影响。结果表明:当固定碳质量分数从70.17%增大到88.34%时,固定碳质量分数对煤的表面形貌、比表面积、孔容以及孔径分布的影响不显著;当固定碳质量分数从88.34%增大到94.45%时,煤的比表面积、微孔孔容分别增大1.84倍和5.06倍,孔径分布向微孔方向移动;Langmuir体积VL与固定碳质量分数(70.17%～94.45%)呈U型的二次多项式关系。Four kinds of coal with different fixed carbon content were selected as experimental samples. The sur- face morphology and textural character of the samples were characterized by scanning electron microscope （ SEM）, N2 adsorption-desorption at 77 K, respectively, and their specific surface, pore volume and pore-size distribution were cal- culated based on N2 adsorption-desorption isotherms. And the volumetric method was used to determine its performance of methane adsorption. The influences of fixed carbon content on coal surface morphology, specific surface area, pore volume, pore size distribution and methane sorption capacity were discussed. The results show that fixed carbon con- tent has little influence on specific surface area, pore volume, and pore size distribution when fixed carbon content is in the range of 70.17% -88.34%. When fixed carbon content changes from 88.34% to 94.45% , coal specific surface area and mieropore volume increases 1.84 and 5.06 times respectively, and the pore size distribution moves to micro- pore. Methane adsorption capacity follows a U shape second-order polynomial trend with fixed carbon content.

关 键 词：固定碳 表面形貌 孔结构 甲烷 Langmuir体积 

分 类 号：TD712.6[矿业工程—矿井通风与安全] TD712.1