北京科技大学学报Issue(11)：1545-1551,7.DOI:10.13374/j.issn1001-053x.2014.11.018
纤维素在炭化和活化过程中的结构变化
Structural evolution of cellulose during carbonization and activation
摘要
Abstract
Carbon samples were prepared from cellulose by carbonization under the nitrogen atmosphere and water steam activa-tion. Their structure and specific surface area during carbonation and activation processes were studied by thermal analysis, Fourier transform infrared spectroscopy, X-ray diffraction, and nitrogen adsorption at low temperature. The results show that groups in the cellulose molecular structure like C—OH, C—O—C and C—H are mostly pyrolyzed completely between 280 - 380 ℃ . A few frag-ments or surface groups produced during pyrolysis decompose continuously above 380 ℃ . Meanwhile, carbon atoms rearrange within the solid sample and form graphite crystallites. Carbonization temperature exerts a crucial influence on the microcrystalline carbon structure and pore structure. With the rise of carbonation temperature, the size of graphite crystallites increases and the pore structure develops, but the specific surface area of the carbon prepared first increases and then decreases, reaching maximum at 600 ℃ . Carbon-ization time has less significant influence on the structures. With increasing activation time, non-crystalline carbon is oxidized, the spe-cific surface area and total pore volume of the carbon sample increase simultaneously. However, a longer activation time causes that the original crystalline carbon structure is destroyed, the specific surface area and total pore volume of the carbon sample decrease. The po-rosity is mostly abundant when non-crystalline carbon is fully oxidized and the original crystalline carbon structure is not destroyed.关键词
纤维素/炭化/活化/微晶/比表面积Key words
cellulose/carbonization/activation/microcrystals/specific surface area分类
化学化工引用本文复制引用
朱琼琼,周花蕾,李文军,常志东,孙长艳..纤维素在炭化和活化过程中的结构变化[J].北京科技大学学报,2014,(11):1545-1551,7.基金项目
中国石油科技创新基金资助项目(2012D-5006-0208) （2012D-5006-0208）
中央高校基本科研业务费资助项目(FRF- BR-13-008,FPR- SD-13-002B) （FRF- BR-13-008,FPR- SD-13-002B）
北京科技大学冶金研究基金资助项目( YJ2012-008) （ YJ2012-008）
国家自然科学基金资助项目(21271022) （21271022）
中国石油天然气股份有限公司资助项目(2011B-1303) （2011B-1303）
