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首页> 外文期刊>Journal of Analytical & Applied Pyrolysis >Molecular characterization of biochar from five Brazilian agricultural residues obtained at different charring temperatures
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Molecular characterization of biochar from five Brazilian agricultural residues obtained at different charring temperatures

机译：在不同炭化温度下获得的五个巴西农业残留物中生物炭的分子表征

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摘要

Important parameters that influence biochar properties include charring temperature and biomass type. We characterized the molecular properties of biochars from five agricultural residues with pyrolysis gas chromatography mass/spectrometry (pyrolysis-GC/MS) in comparison with atomic H/C and N/C ratios. Feedstocks included chicken manure, eucalyptus sawdust, coffee husk, sugarcane bagasse and pine bark. Biochars produced at three different temperatures (T-char) were analyzed, including 350, 450 and 750 degrees C, as well as the uncharred materials. The optimum temperature during analysis with pyrolysis-GC/MS (T-py) was examined. T-py 600 degrees C gave the best results for all T-char by showing a larger diversity of pyrolysis products compared to T-py 700 degrees C and 800 degrees C; T-py 600 degrees C was therefore used for qualitative and quantitative comparison of the samples. Charring temperature was the dominant factor that determined the chemical composition of the biochar pyrolysates. Uncharged feedstocks had the largest contribution from carbohydrates, lignin phenols and long chain n-alkanes, all of which rapidly decreased with charring; biochars produced at T-char 350 and 450 degrees C showed the largest contribution from phenols, mid-chain n-alkanes, benzofurans, indenes, biphenyls and PAHs, from which the benzofurans, indenes, biphenyls and PAHs were particular abundant in samples produced at T-char 450 degrees C; pyrolysates of biochars produced at T-char 750 degrees C were characterized by branched aliphatics, short chain n-alkanesalkenes and low molecular weight (LMW) benzenes. Factor analysis showed that the variation of products differed largely within some chemical groups. For the N-containing compounds, caffeine, C-16 alkylnitrile and diketopiperazines were associated with uncharred materials, benzonitriles and quinolines were associated with T-char 350-450 degrees C. Another part of the variation of N-containing compounds was associated with chicken manure, and to a lesser extend also coffee husk, independently of T-char. For all five agricultural residues, the highest chemical diversity was found for biochar produced at T-char 350 degrees C. As the charring temperature increased, the diversity of pyrolysis products diminished.
机译：影响生物炭特性的重要参数包括炭化温度和生物质类型。我们用热解气相色谱质谱/质谱（热解-GC / MS）与原子H / C和N / C比值比较，表征了五个农业残渣中生物炭的分子特性。原料包括鸡粪，桉木锯末，咖啡果壳，甘蔗渣和松树皮。分析了在三种不同温度（T型炭）下产生的生物炭，包括350、450和750摄氏度，以及未烧焦的材料。检查了热解-GC / MS（T-py）分析过程中的最佳温度。与700℃和800℃的T-py相比，600℃的T-py表现出更大的热解产物多样性，因此对于所有T型炭而言，都能获得最佳结果。因此，将T-py 600摄氏度用于样品的定性和定量比较。炭化温度是决定生物炭热解产物化学成分的主要因素。不加料的原料中碳水化合物，木质素酚和长链正构烷烃的贡献最大，随着炭化的增加，所有这些迅速减少。在350℃和450℃的T型炭生产的生物炭中，苯酚，中链正构烷烃，苯并呋喃，茚满，联苯和PAH的贡献最大，其中在T-炭450摄氏度;在750℃的T型炭中产生的生物炭的热解产物的特征在于支链脂肪族，短链正构烷烃/烯烃和低分子量（LMW）苯。因子分析表明，某些化学组内产物的变异差异很大。对于含N的化合物，咖啡因，C-16烷基腈和二酮哌嗪与未烧焦的物质相关，苄腈和喹啉与T-char 350-450摄氏度相关。含N化合物变化的另一部分与鸡肉相关肥料，并且在较小程度上还包括咖啡果壳，与T-char无关。对于所有五个农业残留物，发现在350摄氏度的T型炭中产生的生物炭具有最高的化学多样性。随着炭化温度的升高，热解产物的多样性降低。

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  • 来源
    《Journal of Analytical & Applied Pyrolysis》 |2018年第3期|106-117|共12页
  • 作者

    Schellekens Judith; Silva Carlos Alberto; Buurman Peter; Rittl Tatiana F.; Domingues Rimena R.; Justi Marina; Vidal-Torrado Pablo; Trugilho Paulo Fernando;

  • 作者单位

    Escola Super Agr Luiz de Queiroz ESALQ USP, Dept Ciencia Solo, Av Padua Dias 11, Piracicaba, SP, Brazil;

    Univ Fed Lavras UFLA, Dept Ciencia Solo, Av Dr Sylvio Menicucci 1001, Lavras, MG, Brazil;

    Wageningen Univ, Earth Syst Sci Grp, POB 47, NL-6700 AA Wageningen, Netherlands;

    Atmospher Environm Res IMK IFU, Inst Meteorol & Climate Res, Campus Alpin, Garmisch Partenkirchen, Germany;

    Univ Fed Lavras UFLA, Dept Ciencia Solo, Av Dr Sylvio Menicucci 1001, Lavras, MG, Brazil;

    Univ Fed Lavras UFLA, Dept Ciencia Solo, Av Dr Sylvio Menicucci 1001, Lavras, MG, Brazil;

    Escola Super Agr Luiz de Queiroz ESALQ USP, Dept Ciencia Solo, Av Padua Dias 11, Piracicaba, SP, Brazil;

    Univ Fed Lavras UFLA, Dept Ciencias Florestais, Av Dr Sylvia Menicucci 1001, Lavras, MG, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biochar; Pyrolysis-GC/MS; Sugarcane bagasse; Pine bark; Coffee husk; Chicken manure;

    机译：生物炭;热解-GC / MS;甘蔗渣;松树皮;咖啡果皮;鸡粪;

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