生物炭的分子特征及其与碳永久性的关系

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS
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引用次数: 0

摘要

利用热解气相色谱质谱法(Py-GC/MS)研究了从森林、粮食、农业废弃物和污水污泥中生产的生物炭碳结构中存在的分子化合物。结果表明,随着生物炭生产温度(PT)的升高,总热解产率降低,大分子结构变得更加凝结,芳香族连接的烷基化程度降低,从而表明碳结构稳定。这些高度稳定的生物炭样品主要由惰性碳组成,其整个随机反射率(Ro)分布高于惰性碳基准(IBRo2%)。这些结果与高温生物炭的高碳稳定性相吻合。相比之下,碳化不充分的生物炭样品主要由半惰性生物炭组成,其分子结构中含有烷烃痕迹、挥发性化合物和更高程度的烷基化与芳香链接。这表明它们更容易被氧化和微生物分解,因此碳结构的凝结程度和稳定性较低。此外,在惰性生物炭中出现这些化合物表明生物炭碳结构中保留了游离碳氢化合物。Py-GC/MS 数据与微观和大块地球化学数据相辅相成,对评估生物炭样品的稳定性条件大有裨益。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Molecular characterization of biochar and the relation to carbon permanence

Molecular compounds present in biochar carbon structure are studied from biochar produced from forest, food, and agricultural wastes and sewage sludge using pyrolysis gas chromatography mass spectrometry (Py-GC/MS). The results show that with increasing biochar production temperature (PT), the total pyrolysis yield decreases, and the macromolecular structure becomes more condensed with the aromatic linkages becoming less alkylated, hence indicating a stable carbon structure. These highly stable biochar samples consist predominantly of inertinite and have the entire random reflectance (Ro) distributions above the inertinite benchmark (IBRo2%). The results are aligned with high carbon stability of high-temperature biochar. In contrast, biochar samples that were insufficiently carbonized and comprised of mainly semi-inertinitic biochar contain alkane traces, volatile compounds, and higher degrees of alkylation with aromatic linkages in their molecular structure. This indicates the more proneness to oxidative and microbial breakdown, and therefore a less condensed and less stable carbon structure. Additionally, occurrence of these compounds in inertinitic biochar indicate retention of free hydrocarbons within the biochar carbon structure. Complimenting microscopic and bulk geochemical data, Py-GC/MS data is additionally advantageous to assess the stability conditions of the biochar samples.

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来源期刊
International Journal of Coal Geology
International Journal of Coal Geology 工程技术-地球科学综合
CiteScore
11.00
自引率
14.30%
发文量
145
审稿时长
38 days
期刊介绍: The International Journal of Coal Geology deals with fundamental and applied aspects of the geology and petrology of coal, oil/gas source rocks and shale gas resources. The journal aims to advance the exploration, exploitation and utilization of these resources, and to stimulate environmental awareness as well as advancement of engineering for effective resource management.
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