Laboratoire de Chimie Organique Appliquée, Département de Chimie, Faculté des Sciences Semlalia, Université Cadi Ayyad, BP 2390, 40001 Marrakech, Morocco.
Bioresour Technol. 2011 Dec;102(24):11234-8. doi: 10.1016/j.biortech.2011.09.010. Epub 2011 Sep 29.
Thermal degradation and kinetics for olive residue and sugar cane bagasse have been evaluated under dynamic conditions in the presence of nitrogen atmosphere, using a non-isothermal thermogravimetric method (TGA). The effect of heating rate was evaluated in the range of 2-50 K min(-1) providing significant parameters for the fingerprinting of the biomass. The DTG plot for the olive residue and sugar cane bagasse clearly shows that the bagasse begins to degrade at 473 K and exhibits two major peaks. The initial mass-loss was associated with hemicellulose pyrolysis and responsible for the first peak (538-543 K) whereas cellulose pyrolysis was initiated at higher temperatures and responsible for the second peak (600-607 K). The two biomass mainly devolatilized around 473-673 K, with total volatile yield of about 70-75%. The char in final residue was about 19-26%. Mass loss and mass loss rates were strongly affected by heating rate. It was found that an increase in heating rate resulted in a shift of thermograms to higher temperatures. Ozawa-Flynn-Wall and Vyazovkin methods were applied to determine apparent activation energy to the olive residue and sugar cane bagasse. Two different steps were detected with apparent activation energies in the 10-40% conversion range have a value of 153-162 kJ mol(-1) and 168-180 kJ mol(-1) for the hemicellulose degradation of olive residue and sugar cane bagasse, respectively. In the 50-80% conversion range, this value is 204-215 kJ mol(-1) and 231-240 kJ mol(-1) for the cellulose degradation of olive residue and sugar cane bagasse, respectively.
在氮气气氛下，使用非等温热重法（TGA），在 2-50 K min(-1) 的加热速率范围内评估了橄榄油残渣和甘蔗渣的热降解和动力学。评估了加热速率的影响，范围为 2-50 K min(-1)，为生物质的特征分析提供了重要参数。橄榄油残渣和甘蔗渣的 DTG 图谱清楚地表明，蔗渣在 473 K 开始降解，并显示出两个主要峰。初始质量损失与半纤维素热解有关，负责第一个峰（538-543 K），而纤维素热解在更高的温度下开始，负责第二个峰（600-607 K）。两种生物质主要在 473-673 K 左右挥发，总挥发物产率约为 70-75%。最终残渣中的焦碳约为 19-26%。质量损失和质量损失率受到加热速率的强烈影响。研究发现，加热速率的增加导致热谱向更高温度移动。Ozawa-Flynn-Wall 和 Vyazovkin 方法被应用于确定橄榄油残渣和甘蔗渣的表观活化能。在 10-40%转化率范围内，检测到两个不同的步骤，橄榄油残渣和甘蔗渣的半纤维素降解的表观活化能分别为 153-162 kJ mol(-1)和 168-180 kJ mol(-1)。在 50-80%转化率范围内，橄榄油残渣和甘蔗渣的纤维素降解的表观活化能分别为 204-215 kJ mol(-1)和 231-240 kJ mol(-1)。
