Study on the gas evolution and char structural change during pyrolysis of cotton stalk

被引：92
作者：
Fu, Peng [1 ,2 ]
Hu, Song [2 ]
Xiang, Jun [2 ]
Sun, Lushi [2 ]
Su, Sheng [2 ]
An, Senmeng [1 ]
机构：
[1] Shandong Univ Technol, Sch Agr & Food Engn, Zibo 255049, Peoples R China
[2] Huazhong Univ Sci & Technol, State Key Lab Coal Combust, Wuhan 430074, Peoples R China
来源：
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS | 2012年 / 97卷
基金：
中国国家自然科学基金;
关键词：
Cotton stalk; Pyrolysis; Gas release; Char structure; HEATING-RATE; BIOMASS; ADSORPTION; TEMPERATURE; REACTIVITY;
D O I：
10.1016/j.jaap.2012.05.012
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The gas release properties and char structural evolution during the pyrolysis of cotton stalk were investigated. The evolution characteristics of volatile products were examined by pyrolysis-Fourier transform infrared spectroscopy (FTIR)/thermal conductivity detection (TCD) analysis (Py-FTIR/TCD). The char chemical structure and physical characteristics were investigated by means of FTIR and N-2 physisorption techniques. Evolution characteristics of the main volatile products were given. The evolution of CO2 was approximately 26 degrees C earlier than that of CO. CH4 evolution covered over a wider temperature range of 300-600 degrees C, with a maximum at 394 degrees C. The amount of hydroxyl, aliphatic C-H and olefinic C = C bonds in the char decreased significantly above 250 degrees C. The aromatization process started at approximate to 350 degrees C and continued to higher temperatures, leaving the char enriched with condensed aromatic ring systems. The BET surface area increased continually with increasing temperature to reach a maximum value of 4.68 m(2)/g at 500 degrees C and decreased at higher temperatures. The micropore volume showed a similar behavior to the surface area, while the mesopore volume and total pore volume always increased. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码：130 / 136
页数：7
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