CO2 utilization in chemical looping gasification and co-gasification of lignocellulosic biomass components over iron-based oxygen carriers: Thermogravimetric behavior, synergistic effect, and reduction characteristics
CO2 utilization in chemical looping gasification and co-gasification of lignocellulosic biomass components over iron-based oxygen carriers: Thermogravimetric behavior, synergistic effect, and reduction characteristics
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DOI：
10.1016/j.jece.2023.109971
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发表时间：
2023-04
影响因子：
7.7
通讯作者：
P. Kuo;Zhuang Sun;Faruk Özdemir;M. Aziz;Wei Wu
中科院分区：
文献类型：
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作者：
P. Kuo;Zhuang Sun;Faruk Özdemir;M. Aziz;Wei Wu
生物质热化学转化过程中的CO2高效利用在创造未来低碳经济中发挥着重要作用。采用热重法和差热分析法研究了木质纤维素生物质组分（半纤维素、纤维素和木质素）与氧化铁载氧体的CO2辅助化学链气化和共气化过程。考虑了三种不同的氧化铁载氧体与生物质（O/B）比，以深入了解单个组分（O/B比：0）及其与氧化铁载氧体（O/B比：0.5和1）的共混物的热降解特性。同时，从X射线衍射（XRD）、协同作用和还原度等方面研究了生物质三种主要组分的还原特性。实验结果表明，氧化铁载氧体的存在可以加速反应动力学，这是由于高温（600-950 °C）下生物质中焦炭的直接还原反应与Boudouard反应之间的竞争关系。有趣的是，在高温下观察到还原氧化铁的再氧化行为，特别是木质素。在所测试的所有生物质材料中，它们在CO2气氛下还原氧化铁氧载体的能力遵循生物质混合物（1：1：1 wt%）>木质素>木聚糖>纤维素。此外，研究结果表明，显着的协同作用存在于CO2辅助化学链共气化过程中。
Efficient CO2utilization in the thermochemical conversion of biomass plays an important role in creating a future low-carbon economy. This study attempts to explore the CO2-assisted chemical looping gasification and co-gasification process of lignocellulosic biomass components (hemicellulose, cellulose, and lignin) with iron oxide oxygen carriers using thermogravimetry and differential thermal analysis. Three different iron oxide oxygen carrier-to-biomass (O/B) ratios were taken into account to deeply understand the thermal degradation characteristics of individual components (O/B ratio: 0) and their blending with iron oxide oxygen carriers (O/B ratio: 0.5 and 1). Meanwhile, the reduction characteristics of three major biomass components were also investigated in terms of X-ray diffraction (XRD), synergistic interaction, and reduction degree. Experimental results suggest that the existence of iron oxide oxygen carriers could accelerate the reaction kinetics under the reactive CO2environment, arising from the competitive relationship between the direct reduction reaction by char in biomass and the Boudouard reaction at high temperatures (600–950 °C). Interestingly, the reoxidation behavior of the reduced iron oxide is observed at high temperatures, especially for lignin. Among all the tested biomass materials, their ability to reduce iron oxide oxygen carriers under the CO2atmosphere follows the order of biomass mixture (1:1:1 wt%)>lignin>xylan>cellulose. Moreover, the findings indicate that significant synergistic interaction exists during the CO2-assisted chemical looping co-gasification process.