Evolution in functional groups of agricultural straw during pyrolysis at elevated temperature: In situ synchrotron radiation infrared spectroscopy

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-08-08 DOI:10.1016/j.biortech.2025.133125

Tao Xu , Lingyun Chen , Jie Chen , Sadvakassova Assem

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Abstract

Thermal evolution of functional groups during pyrolysis of wheat and rice straws was investigated using in situ diffuse reflectance infrared Fourier transform spectroscopy at 200 °C to 400 °C. Aromatic rings transitioned through substitution states, with tri-/tetra-/penta-substituted configurations coexisting below 300 °C before complete conversion to tri-substituted forms. Oxygen-containing groups showed bifurcated behaviour: ether CO bonds decreased by 15.4–28.9 %, while lignin-associated CO bonds increased 47.1–68.5 %, with COC asymmetric stretching attenuating 9.5 %. Phenolic CO bonds became thermally labile above 350 °C. Alkane CH₂ maintained structural stability below 350 °C. Hydroxyl groups displayed dual-phase evolution: 23.4–35.6 % intensity gain below 250 °C followed by >95 % depletion above 400 °C. Quantitative correlations between pyrolysis thresholds and functional group stability provided critical parameters for optimizing biomass pyrolysis.

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农业秸秆高温热解过程中官能团的演化：原位同步辐射红外光谱

利用原位漫反射红外傅立叶变换光谱研究了小麦和水稻秸秆在200 ~ 400℃热解过程中官能团的热演化。芳环通过取代态过渡，在300°C以下，三/四/五取代构型共存，然后完全转化为三取代构型。含氧基团表现出分叉行为：醚CO键减少15.4 - 28.9%，木质素相关CO键增加47.1 - 68.5%，COC不对称拉伸减弱9.5%。酚醛CO键在350°C以上变得热不稳定。烷烃CH2在350℃以下保持结构稳定性。羟基呈现双相演化：250℃以下强度增加23.4 ~ 35.6%，400℃以上强度减少95%。热解阈值与官能团稳定性之间的定量相关性为优化生物质热解提供了关键参数。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.