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Thermal Decomposition and Kinetics Analysis of Microwave Pyrolysis of Dunaliella salina Using Composite Additives
BioEnergy Research ( IF 3.1 ) Pub Date : 2020-06-23 , DOI: 10.1007/s12155-020-10150-7
Chunxiang Chen , Xiaoyan Bu , Dengchang Huang , Yuting Huang , Haozhong Huang

The thermal characteristics and kinetics of the microalgae Dunaliella salina were evaluated through microwave catalytic pyrolysis under composite additives (blends of graphite (GP) and Na2CO3 (NC)). GP was blended with NC of 0%, 30%, 50%, 70%, and 100%, which were named as NC, 3GP7NC, 5GP5NC, 7GP3NC, and GP. Then different amounts (5%, 10%, and 15%) of NC and 5GP5NC were also studied. The pyrolysis characteristic parameters, characteristic index (D) and activation energy (E), and thermodynamic parameters, including enthalpy (∆H) and Gibbs free energy (∆G), were studied in this paper. In all the groups with the amount of 5%, the initial decomposition temperature (Ti) decreased with the NC proportion of the composite additive increased. The 5GP5NC group obtained the largest values of maximum weight loss rate (Rmax), average weight loss rate (Rmean), and D, which were 3.78%/min, 1.67%/min, and 12.35 × 10−7, respectively. However, the NC group achieved a small value of E (66.28 kJ/mol), ∆H (60.46 kJ/mol), and ∆G (175.97 kJ/mol). When changing the amounts of 5GP5NC, the suitable amount was 15%, based on its largest D (13.76 × 10−7), smallest E (52.49 kJ/mol), excellent weight loss, and thermodynamic characteristic. For NC, the maximum Rmax was obtained at 15%, while the greatest D and minimum E were achieved at 5%.



中文翻译:

复合添加剂对杜氏盐藻微波热解的热分解和动力学分析

在复合添加剂(石墨(GP)和Na 2 CO 3(NC)的混合物)下,通过微波催化热解法评估了微藻杜氏盐藻的热特性和动力学。GP与0%,30%,50%,70%和100%的NC混合,分别命名为NC,3GP7NC,5GP5NC,7GP3NC和GP。然后还研究了不同含量(5%,10%和15%)的NC和5GP5NC。热解特性参数,特性指标(D)和活化能(E)以及热力学参数,包括焓(∆ H)和吉布斯自由能(∆ G),本文进行了研究。在所有含量为5%的组中,初始分解温度(T i)随着复合添加剂的NC比例的增加而降低。5GP5NC组的最大失重率(R max),平均失重率(R mean)和D的最大值分别为3.78%/ min,1.67%/ min和12.35×10 -7。但是,NC组的E(66.28 kJ / mol),H(60.46 kJ / mol)和G(175.97 kJ / mol)较小。更改5GP5NC的量时,基于最大D值,合适的量为15%(13.76×10 -7),最小E(52.49 kJ / mol),极好的失重和热力学特性。为NC,最大- [R最大为15%,获得,而最大的d和最小Ë在5%来实现的。

更新日期:2020-06-23
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