Combustion and pyrolysis of activated carbon fibre from oil palm empty fruit bunch fibre assisted through chemical activation with acid treatment
Combustion and pyrolysis of activated carbon fibre from oil palm empty fruit bunch fibre assisted through chemical activation with acid treatment
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DOI：
10.1016/j.jaap.2014.10.010
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发表时间：
2014-11-01
影响因子：
6
通讯作者：
Yeoh, Fei-Yee
中科院分区：
文献类型：
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作者：
Lee, Ting;Zubir, Zuhana Ahmad;Yeoh, Fei-Yee
热化学反应即燃烧和热解是生物质从农业废弃物转化为功能材料活性碳纤维(ACF)的重要过程。燃烧和热解过程中的酸处理会对ACF的质量和性能产生重大影响，如孔径控制和比表面积增大。在这项研究中，空果串(EFB)纤维的碳化和活化为ACF采用了酸处理辅助燃烧和热解然后CO2气体流动的方法。通过在燃烧和热解前后施加硫酸并改变酸处理的顺序，研究了酸处理对煤的物化性质和孔特征的影响。与未经酸处理的EFB纤维相比，酸处理的EFB纤维发生了硫酸插层和剥离反应，导致了较高的热降解率。经酸处理的ACF样品具有较高的比表面积和总孔容。较高的孔容是由于插层硫化物促进了挥发性物质的去除，并产生了更多的可供吸附的孔。然而，严重的酸氧化也可能导致孔道堵塞和过量的氧络合物，并产生有限的孔隙率。结果表明，ACF的性能受酸处理顺序的影响，具体取决于所采用的热化学工艺。(C)2014爱思唯尔B.V.保留所有权利。
Thermochemical reactions viz, combustion and pyrolysis are important processes in the conversion of biomass from agricultural wastes into functional materials activated carbon fibre (ACF). Acid treatment during combustion and pyrolysis leaves a major impact which affects quality and properties of the resulting ACF such as pore size control and surface area enlargement. In this study, carbonisation and activation of empty fruit bunch (EFB) fibre into ACF was carried out using acid treatment assisted combustion and pyrolysis followed by CO2 gas flow. The effects of acid treatment on the physicochemical properties and pore characteristics was studied by applying sulphuric acid and switching the sequence of acid treatment before and after combustion and pyrolysis. Intercalation of sulphuric acid and exfoliation reactions on the acid-treated EFB fibre resulted in a higher thermal degradation rate compared to raw EFB fibre without acid treatment. Higher BET surface area and total pore volume were obtained for ACF samples treated with acid. The higher pore volume is due to the intercalated sulphuric compound which facilitated the removal of volatile matter and generated more pores for adsorption. However, severe acid oxidation could also lead to pore blocking with excess oxygen complexes and creation of limited porosity. The results show that properties of the ACF can be affected by the sequence of the acid treatment depending on the thermochemical process applied. (C) 2014 Elsevier B.V. All rights reserved.