微晶纤维素
热液循环
材料科学
水热碳化
球磨机
微晶
碳化
纤维素
球(数学)
化学工程
复合材料
环境压力
化学
热力学
结晶学
数学
物理
数学分析
工程类
扫描电子显微镜
作者
Kaile Li,Jiahui Hu,Zhiqiang Xu,Shijie Yu,Qinghai Li,Yanguo Zhang,Hui Zhou
标识
DOI:10.1016/j.gee.2025.07.016
摘要
Hydrothermal treatment of cellulose is a promising green route for bioenergy and biochemical production, yet requiring investigations of the mechanisms. In this study, the effects of cellulose crystallinity and decoupled temperature and pressure conditions on cellulose conversion and product distribution were investigated. Microcrystalline cellulose was ball-milled for varying durations, leading to a reduction in crystallinity, with 4 h of milling sufficient to achieve near-complete amorphization. Unlike concurrent recrystallization and hydrolysis observed under autogenous pressure, decoupled conditions significantly accelerated hydrolysis of cellulose. Notably, lower crystallinity cellulose exhibited significant improvements in glucose and 5-HMF yields, with 4-hour ball milling showing optimal performance among all samples. Furthermore, carbon sub-micron spheres were largely produced, which were confirmed via PTFE encapsulation experiments to primarily consist of secondary char deriving from re-polymerization and condensation reactions of the liquid phase. Overall, this study demonstrates that lower crystallinity not only facilitates hydrolysis but also accelerates the carbonization processes under decoupled pressure conditions, highlighting its potential for efficient biomass conversion into valuable products. Ball milling (0–8 h, 1000 r/min) reduces crystallinity to enhance hydrothermal reactivity. Multi-scale characterizations reveal how decoupled temperature and pressure hydrothermal conditions dictate reaction mechanisms, unlocking pathways for efficient biomass valorization. • Ball milling reduces cellulose crystallinity, enhancing reactivity and hydrolysis • DTPH outperforms traditional methods in cellulose conversion and carbonization • Low-crystallinity cellulose rapidly generates higher glucose/5-HMF yields • PTFE experiments verify biochar mainly from glucose-derived secondary char • Sustainable hydrochar produced under low pressure and temperature conditions
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