文献类型：期刊文献

英文题名：Effects of Pyrolysis on the Pore Structure of Four Chinese Coals

作者：Xu, Shenqi[1];Zhou, Zhijie[1];Yu, Guangsuo[1];Wang, Fuchen[1]

机构：[1]E China Univ Sci & Technol, Minist Educ, Key Lab Coal Gasificat, Shanghai 200237, Peoples R China

年份：2010

卷号：24

期号：2

起止页码：1114

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：20100912745197);WOS:【SCI-EXPANDED(收录号:WOS:000274514400048)】；

基金：This work has been partially supported by the Major State Basic Research Development Program of China (973 program, 2004CB217704) the National Natural Science Foundation of China (20876048). the application of new, coal-gasification technology (2008AA05Z310), the Program for Changiiang Scholars and Innovative Research Team in University (IRT0620), and the Program for New Century Excellent Talents in University (NCET-06-0416).

语种：英文

外文关键词：Pore size - Pyrolysis - Morphology - Surface morphology - Coal - Heating rate - Fractal dimension - Gas adsorption - Heating

摘要：To study the influences of coal ash fusion on pore structure and surface morphology, four typical Chinese coals with different AFT (ash fusion temperature) were pyrolyzed in the range of pore structure and surface morphology of chars prepared at different temperatures and heating rate were investigated by N-2 adsorption/desorption at 77 K. The results of N-2 gas adsorption/desorption isotherms indicate that different coals and chars showed different adsorption/desorption characteristics at relative pressures of 0-0.5 and 0.5-1. The pore shape inside coal and char particles was analyzed based oil the N-2 adsorption/desorption isotherms. Two fractal dimensions D-1 and D-2 (at relative pressures of 0-0.5 and 0.5-1, respectively) were calculated using the fractal FHH (Frenkel-Halsey-Hill) method. Specific surface area and average pore size of samples were also obtained through the BET model. Results show that the melting ash very probably caused the changes of pore structure inside the char particles or even inhibited the formation of pores when coal pyrolyzed in slow heating rate at the range of AFT. Fractal dimension of char, not only relates to pyrolysis temperature and heating rate, but also connects to the original coal. Fractal theory is suitable to describe the pore structure and surface morphology. Relationships between fractal dimension and carbon content, as well as fractal dimension and ash content, were also determined by second polynomial fitting.