期刊
NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/s41467-022-31352-x
关键词
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资金
- National Natural Science Foundation of China [52070116]
- Key R&D Program of Guangdong Province [2020B1111380001]
- Tsinghua University-Shanxi Clean Energy Research Institute Innovation Project Seed Fund
- foundation of Westlake University
This study presents a hydrothermal system that allows independent control of temperature and pressure, enabling fast synthesis of carbon sub-micron spheres from cellulose. By decoupling temperature and pressure, the degradation temperature of cellulose is significantly reduced, leading to accelerated production of carbon sub-micron spheres and reduced carbon emissions.
Temperature and pressure are typically dependent parameters in hydrothermal processes. Here, authors devise a hydrothermal system that allows independent control of these parameters and realize low-temperature fast synthesis of carbon sub-micron spheres directly from cellulose at higher pressure. The temperature and pressure of the hydrothermal process occurring in a batch reactor are typically coupled. Herein, we develop a decoupled temperature and pressure hydrothermal system that can heat the cellulose at a constant pressure, thus lowering the degradation temperature of cellulose significantly and enabling the fast production of carbon sub-micron spheres. Carbon sub-micron spheres can be produced without any isothermal time, much faster compared to the conventional hydrothermal process. High-pressure water can help to cleave the hydrogen bonds in cellulose and facilitate dehydration reactions, thus promoting cellulose carbonization at low temperatures. A life cycle assessment based on a conceptual biorefinery design reveals that this technology leads to a substantial reduction in carbon emissions when hydrochar replacing fuel or used for soil amendment. Overall, the decoupled temperature and pressure hydrothermal treatment in this study provides a promising method to produce sustainable carbon materials from cellulose with a carbon-negative effect.
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