Division of Salt & Marine Chemicals, CSIR - Central Salt & Marine Chemicals Research Institute, G B Marg, Bhavnagar 364002, Gujarat, India; Academy of Scientific & Innovative Research (AcSIR), CSIR - Central Salt & Marine Chemicals Research Institute, G B Marg, Bhavnagar 364002, Gujarat, India.
Academy of Scientific & Innovative Research (AcSIR), CSIR - Central Salt & Marine Chemicals Research Institute, G B Marg, Bhavnagar 364002, Gujarat, India; Analytical Division and Centralized Instrument Facility, CSIR - Central Salt & Marine Chemicals Research Institute, G B Marg, Bhavnagar 364002, Gujarat, India.
Bioresour Technol. 2016 Dec;221:251-261. doi: 10.1016/j.biortech.2016.09.022. Epub 2016 Sep 8.
Non-isothermal (β=5, 10, 20, 35°C/min) pyrolysis of de-oiled microalgal biomass (DMB) of Chlorella variabilis was investigated by TGA-MS (30-900°C, Argon atmosphere) to understand thermal decomposition and evolved gas analysis (EGA). The results showed that three-stage thermal decomposition and three volatilization zone (100-400°C, 400-550°C and 600-750°C) of organic matters during pyrolysis. The highest rate of weight-loss is 8.91%/min at 302°C for 35°C/min heating-rate. Kinetics of pyrolysis were investigated by iso-conversional (KAS, FWO) and model-fitting (Coats-Redfern) method. For Zone-1and3, similar activation energy (E) is found in between KAS (α=0.4), FWO (α=0.4) and Avrami-Erofe'ev (n=4) model. Using the best-fitted kinetic model Avrami-Erofe'ev (n=4), E values (R=>0.96) are 171.12 (Zone-1), 404.65 (Zone-2) and 691.42kJ/mol (Zone-3). EGA indicate the abundance of most gases observed consequently between 200-300°C and 400-500°C. The pyrolysis of DMB involved multi-step reaction mechanisms for solid-state reactions having different E values.
非等温热解（β=5、10、20、35°C/min）条件下利用 TGA-MS（30-900°C，氩气气氛）研究了小球藻脱油生物质（DMB）的热解过程，以了解热分解和挥发分析（EGA）。结果表明，在热解过程中有三个阶段的热分解和三个挥发区（100-400°C、400-550°C 和 600-750°C）。在 35°C/min 的加热速率下，最大失重速率为 8.91%/min，温度为 302°C。通过等转化率（KAS、FWO）和模型拟合（Coats-Redfern）方法研究了热解动力学。对于区域 1 和 3，发现 KAS（α=0.4）、FWO（α=0.4）和 Avrami-Erofe'ev（n=4）模型之间的活化能（E）相似。使用最佳拟合的动力学模型 Avrami-Erofe'ev（n=4），E 值（R≥0.96）分别为 171.12（区域 1）、404.65（区域 2）和 691.42kJ/mol（区域 3）。EGA 表明，在 200-300°C 和 400-500°C 之间观察到的大多数气体的丰度随之而来。DMB 的热解涉及具有不同 E 值的多步反应机制的固态反应。
