Breaking the temperature limit of hydrothermal carbonization of lignocellulosic biomass by decoupling temperature and pressure

IF 10.7 1区 工程技术 Q1 CHEMISTRY, PHYSICAL
Shijie Yu, Xiaoxiao Yang, Qinghai Li, Yanguo Zhang, Hui Zhou
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引用次数: 16

Abstract

Hydrothermal carbonization (HTC) of lignocellulosic biomass is a promising technology for the production of carbon materials with negative carbon emissions. However, the high reaction temperature and energy consumption have limited the development of HTC technology. In conventional batch reactors, the temperature and pressure are typically coupled at saturated states. In this study, a decoupled temperature and pressure hydrothermal (DTPH) reaction system was developed to decrease the temperature of the HTC reaction of lignocellulosic biomass (rice straw and poplar leaves). The properties of hydrochars were analyzed by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, X-ray diffraction (XRD), thermogravimetric analyzer (TGA), etc. to propose the reaction mechanism. The results showed that the HTC reaction of lignocellulosic biomass could be realized at a low temperature of 200 °C in the DTPH process, breaking the temperature limit (230 °C) in the conventional process. The DTPH method could break the barrier of the crystalline structure of cellulose in the lignocellulosic biomass with high cellulose content, realizing the carbonization of cellulose and hemicellulose with the dehydration, unsaturated bond formation, and aromatization. The produced hydrochar had an appearance of carbon microspheres, with high calorific values, abundant oxygen-containing functional groups, a certain degree of graphitization, and good thermal stability. Cellulose acts not only as a barrier to protect itself and hemicellulose from decomposition, but also as a key precursor for the formation of carbon microspheres. This study shows a promising method for synthesizing carbon materials from lignocellulosic biomass with a carbon-negative effect.

Abstract Image

温度和压力解耦打破木质纤维素生物质水热碳化的温度极限
木质纤维素生物质的水热碳化(HTC)是一种很有前途的生产负碳排放碳材料的技术。然而,高反应温度和高能耗限制了HTC技术的发展。在传统的间歇式反应器中,温度和压力通常在饱和状态下耦合。本研究开发了一种解耦的温压水热(DTPH)反应系统,以降低木质纤维素生物质(稻草和杨树叶)的HTC反应温度。通过扫描电子显微镜(SEM)、傅立叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)、拉曼光谱、X射线衍射(XRD)、热重分析仪(TGA)等对水炭的性质进行了分析,提出了反应机理。结果表明,在DTPH工艺中,木质纤维素生物质的HTC反应可以在200°C的低温下实现,打破了传统工艺中的温度限制(230°C)。DTPH法可以打破高纤维素含量木质纤维素生物质中纤维素结晶结构的障碍,实现纤维素和半纤维素的脱水、不饱和键的形成和芳构化碳化。所制备的水炭具有碳微球的外观,具有较高的热值、丰富的含氧官能团、一定的石墨化程度和良好的热稳定性。纤维素不仅是保护自身和半纤维素不被分解的屏障,也是形成碳微球的关键前体。本研究显示了一种由具有碳负效应的木质纤维素生物质合成碳材料的有前途的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Green Energy & Environment
Green Energy & Environment Energy-Renewable Energy, Sustainability and the Environment
CiteScore
16.80
自引率
3.80%
发文量
332
审稿时长
12 days
期刊介绍: Green Energy & Environment (GEE) is an internationally recognized journal that undergoes a rigorous peer-review process. It focuses on interdisciplinary research related to green energy and the environment, covering a wide range of topics including biofuel and bioenergy, energy storage and networks, catalysis for sustainable processes, and materials for energy and the environment. GEE has a broad scope and encourages the submission of original and innovative research in both fundamental and engineering fields. Additionally, GEE serves as a platform for discussions, summaries, reviews, and previews of the impact of green energy on the eco-environment.
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