Study on catalytic co-pyrolysis of physical mixture/staged pyrolysis characteristics of lignite and straw over an catalytic beds of char and its mechanism
Study on catalytic co-pyrolysis of physical mixture/staged pyrolysis characteristics of lignite and straw over an catalytic beds of char and its mechanism
复制标题
焦炭催化床上褐煤与秸秆物理混合物催化共热解/分级热解特性及机理研究
DOI：
10.1016/j.enconman.2018.01.083
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发表时间：
2018-04
影响因子：
10.4
通讯作者：
Shu Xinqian
中科院分区：
文献类型：
--
作者：
Zhao Hongyu;Song Qiang;Liu Shucheng;Li Yuhuan;Wang Xiaohua;Shu Xinqian
虽然煤与生物质共热解的研究已成为可再生能源利用领域的主要化工产品，但焦油的轻质化仍是一个挑战。本文设计了一套实验方案，包括单独热解、分段催化热解和物理混合物共热解，考察了原料排列方式对热解产物特性的影响。实验结果表明，褐煤和秸秆混合物的共热解过程并非单一热解过程的叠加，而是热解产物的协同作用，从而表征了热解产物的焦油组成和结构。基于现有的催化裂解机理，得出分段催化裂解对重质组分的催化裂解效果比物理混合物共裂解更显著，可生成轻质油、萘油、焦油等氧含量较低、苯含量较高的组分。催化床中半焦的拉曼光谱显示，随着热解温度的升高，半焦的总峰面积和聚合形成的大芳环数量增加。同时，从半焦的化学结构上证实了秸秆半焦的催化裂解作用明显强于褐煤半焦。
Although the study of co-pyrolysis of coal and biomass have dominated the primary chemicals production in the field of renewable energy utilization, it is still challenging for tar to become lighter. Here we design a set of experimental programs, including the individual pyrolysis, staged catalytic pyrolysis and the co-pyrolysis of physical mixture to investigate the effects of feedstock arrangement on pyrolysis product characteristics. We demonstrated that the experimental results of co-pyrolysis of physical mixture indicate some synergetic effects on pyrolysis products rather than the superposition of individual pyrolysis process of lignite and straw, thus the subsequent tar composition and char structure were characterized. Based on the existing catalytic cracking mechanism, we obtained the staged catalytic pyrolysis have a more pronounced catalytic cracking effect on heavy components compared with the co-pyrolysis of physical mixture, which enables the formation of light oil, naphthalene oil, tar with the lower oxygen content and higher benzene. The Raman spectra of char in catalytic bed exhibits the total peak area of char and the amount of large aromatic ring formed by polymerization increased with the increase of pyrolysis temperature. Simultaneously, the role of catalytic cracking of straw char was stronger than that of lignite char remarkably has been confirmed from the point of view of the chemical structure of char.
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