Characterization of lignocellulosic biomass thermal degradation and physiochemical structure: Effects of demineralization by diverse acid solutions
Characterization of lignocellulosic biomass thermal degradation and physiochemical structure: Effects of demineralization by diverse acid solutions
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DOI：
10.1016/j.enconman.2014.03.007
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发表时间：
2014-06-01
影响因子：
10.4
通讯作者：
Daud, Wan Mohd Ashri Wan
中科院分区：
文献类型：
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作者：
Asadieraghi, Masoud;Daud, Wan Mohd Ashri Wan
为了消除生物质热化学过程中无机组分的负面影响，选择了不同稀酸溶液浸出的方法。采用不同的稀酸溶液（H2SO 4、HClO 4、HF、HNO 3、HCl）对棕榈油生物质样品（棕榈仁壳（PKS）、空果串（EFB）和棕榈中果皮纤维（PMF））进行预处理。选择具有最高脱矿质程度的酸来研究脱物质化对生物质热特性和理化结构的影响。采用热重-质谱联用（TGA-MS）和傅里叶变换红外光谱（TGA-FTIR）研究了生物质的热降解过程。TGA和DTG（导数热重分析）表明，由于矿物的催化作用，酸预处理后的最大降解温度提高。在分析过程中，在线检测了主要的永久性逸出气体，包括H-2，CO2，CO。在250-750 ℃温度范围内产生的永久气体主要是由于可冷凝蒸汽裂解和可能的一些二次反应。采用BET法、SEM和FTIR等方法研究了酸处理后生物质样品的理化结构变化。采用一级反应动力学模型研究了不同棕榈油生物质的热解动力学。(C)2014爱思唯尔有限公司版权所有。
To eliminate the negative impacts of inorganic constituents during biomass thermochemical processes, leaching method by different diluted acid solutions was chosen. The different palm oil biomass samples (palm kernel shell (PKS), empty fruit bunches (EFB) and palm mesocarp fiber (PMF)) were pretreated by various diluted acid solutions (H2SO4, HClO4, HF, HNO3, HCl). Acids with the highest degrees of demineralization were selected to investigate the dematerialization impacts on the biomass thermal characteristics and physiochemical structure. Thermogravimetric analysis coupled with mass spectroscopy (TGA-MS) and Fourier transform infrared spectroscopy (TGA-FTIR) were employed to examine the biomass thermal degradation. TGA and DTG (Derivative thermogravimetry) indicated that the maximum degradation temperatures increased after acid pretreatment due to the minerals catalytic effects. The main permanent evolved gases comprising H-2, CO2, CO were detected online during analysis. The major permanent gases produced at the temperature range of 250-750 degrees C were attributed to the condensable vapors cracking and probably some secondary reactions. The physiochemical structure change of the acid-treated biomass samples was examined by using Brunauer Emmett Teller (BET) method, Scanning Electron Microscope (SEM) and FTIR. The pyrolysis kinetics of the different palm oil biomasses were investigated using first order reaction model. (C) 2014 Elsevier Ltd. All rights reserved.