Thermochemical conversion of lignocellulosic bio-waste via fast pyrolysis in molten salts
Thermochemical conversion of lignocellulosic bio-waste via fast pyrolysis in molten salts
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通过熔盐中的快速热解对木质纤维素生物废物进行热化学转化
DOI：
10.1016/j.fuel.2020.118228
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发表时间：
2020-10
期刊：
影响因子：
7.4
通讯作者：
Hong Yao
中科院分区：
文献类型：
--
作者：
Yuhan Yang;Hongyun Hu;Fu Yang;Hua Tang;Huan Liu;Baojun Yi;Xian Li;Hong Yao
本研究首次研究了生物废弃物在300℃熔盐（NaNO3-KNO3-NaNO2）中热解过程中挥发物的排放及热化学转化机理。熔盐中的阳离子作为催化剂，阴离子参与热解反应。与无盐热解相比，更多的生物废弃物在熔盐中分解，产生的气态产物质量是无盐热解的14倍以上，液态产物质量是无盐热解的2倍。此外，还区分了典型生物质成分纤维素、半纤维素和木质素的热化学转化行为。结果表明，木质素最易热解生成大量的液体酸、一些硝化芳香族化合物和更多的CO、H2。相比之下，纤维素的分解肯定受到限制，而阴离子对半纤维素裂解的影响更为显著，产生含氮杂环和胺。此外，还证实了不同生物质组分之间的相互作用会影响生物废弃物热解产物的生成。
This study, for the first time, investigated the volatiles emission and thermochemical conversion mechanism of bio-waste during pyrolysis in molten salts (NaNO3-KNO3-NaNO2) at 300 °C. Cations of molten salts acted as catalysts while anions participated in the pyrolysis reaction. Compared with salt-free pyrolysis, more bio-waste was decomposed in molten salts, to produce more than 14 times the mass of gaseous products and twice the mass of liquid products. Furthermore, the thermochemical conversion behavior of typical biomass constituents, i.e. cellulose, hemicellulose and lignin, was also distinguished. The results suggested that lignin was most easily pyrolyzed to form numerous liquid acids, some nitrated aromatic compounds and more CO, H2. In contrast, the decomposition of cellulose was certainly restricted while more significant effects of anions were found in hemicellulose cracking by generating nitrogen-containing heterocyclic rings and amines. Besides, interactions among different biomass constituents were confirmed to affect the generation of bio-waste pyrolysis products.
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