热解
石墨
化学工程
碳纤维
木屑
催化作用
材料科学
原材料
溶解
生物量(生态学)
碳化
无机化学
吸附
化学
冶金
有机化学
复合材料
海洋学
复合数
工程类
地质学
作者
Zhengshuai Sun,Dingding Yao,Chengyang Cao,Zihang Zhang,Liqi Zhang,Haodong Zhu,Qiaoxia Yuan,Baojun Yi
标识
DOI:10.1016/j.jenvman.2022.115555
摘要
Graphite is a widely used industrial material, which experienced a marked shortage caused by the growing demand for electrode anode material and the increased costs for raw material. Graphitic carbon from biomass is a promising approach that will result in low-cost and efficient preparation. Herein, Fe(NO3)3 was selected as the catalyst for pine sawdust, and the effects of temperature and iron content on the graphitization of biochar were investigated. Additionally, the formation mechanism of the graphitic crystallite structure was explored. Results showed that the formation of pyrolysis gas increased with the increase in the amount of catalyst added or pyrolysis temperature. The change in pyrolysis gas, such as H2 and CO, was a critical auxiliary factor reflecting the conversion process. As temperature was increased from 600 °C to 800 °C, the solid products showed high graphitization and low solid yield. Graphite structure mainly formed at 700 °C because of the formation of Fe nanoparticles. The increase in the amount of catalyst could provide more reaction sites and promote the contact between Fe and C, showing that amorphous carbon is dissolved on Fe nanoparticles and precipitated into ordered graphitic carbon. On this basis, a mechanism of "carbon dissolution-precipitation" was proposed to explain the formation of graphite structure, and the whole pyrolysis process included the transformation of the iron element were analyzed.
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