Determination of pyrolysis characteristics and kinetics of palm kernel shell using TGA-FTIR and model-free integral methods
Determination of pyrolysis characteristics and kinetics of palm kernel shell using TGA-FTIR and model-free integral methods
复制标题
DOI：
10.1016/j.enconman.2014.09.074
复制
发表时间：
2015-01-01
影响因子：
10.4
通讯作者：
Zhang, Qisheng
中科院分区：
文献类型：
--
作者：
Ma, Zhongqing;Chen, Dengyu;Zhang, Qisheng
棕榈油生产过程中产生的棕榈仁壳是一种潜在的生物质能源。对PKS热解行为和动力学的基本理解对其有效的热化学转化至关重要。微分热重（DTG）分析的热降解曲线显示两个明显的质量损失峰，主要与半纤维素和纤维素的分解分别。这一特征与其他生物质（如小麦秸秆和玉米秸秆）不同，仅呈现一个峰或伴有额外的“肩”峰（如小麦秸秆）。通过傅里叶变换红外光谱（FIR）分析，PKS热解产生的主要挥发性组分为CO2（2400-2250 cm（-1）和586-726 cm（-1）），醛、酮、有机酸（1900-1650 cm（-1）），烷烃、酚类（1475-1000 cm（-1））。采用Flynn-Wall-Ozawa（FWO）和Kissinger-Akahira-Sunose（KAS）两种无模型积分方法，在不同的升温速率下，估算了反应活化能与转化率的关系。活化能的波动可以解释为与纤维素，半纤维素和木质素的降解，发生在热解过程中的相互作用的反应的结果。本文采用热重-红外联用技术和无模型积分动力学方法对PKS的热解机理进行了研究。(C)2014爱思唯尔有限公司版权所有。
Palm kernel shell (PKS) from palm oil production is a potential biomass source for bio-energy production. A fundamental understanding of PKS pyrolysis behavior and kinetics is essential to its efficient thermochemical conversion. The thermal degradation profile in derivative thermogravimetry (DTG) analysis shown two significant mass-loss peaks mainly related to the decomposition of hemicellulose and cellulose respectively. This characteristic differentiated with other biomass (e.g. wheat straw and corn stover) presented just one peak or accompanied with an extra "shoulder" peak (e.g. wheat straw). According to the Fourier transform infrared spectrometry (FIR) analysis, the prominent volatile components generated by the pyrolysis of PKS were CO2 (2400-2250 cm(-1) and 586-726 cm(-1)), aldehydes, ketones, organic acids (1900-1650 cm(-1)), and alkanes, phenols (1475-1000 cm(-1)). The activation energy dependent on the conversion rate was estimated by two model-free integral methods: Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) method a different heating rates. The fluctuation of activation energy can be interpreted as a result of interactive reactions related to cellulose, hemicellulose and lignin degradation, occurred in the pyrolysis process. Based on TGA-FTIR analysis and model free integral kinetics method, the pyrolysis mechanism of PKS was elaborated in this paper. (C) 2014 Elsevier Ltd. All rights reserved.