Understanding the Homogeneous Reactions of Primary Tar from Biomass Pyrolysis by Means of Photoionization Mass Spectrometry,Energy & Fuels

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Understanding the Homogeneous Reactions of Primary Tar from Biomass Pyrolysis by Means of Photoionization Mass Spectrometry
Energy & Fuels ( IF 5.2 ) Pub Date : 2020-09-21 , DOI: 10.1021/acs.energyfuels.0c02178
Ke Yang ₁ , Jiahao Wang ₂ , Jiahui Huang ₂ , Jiuzhong Yang ₃ , Yang Pan ₃ , Minggao Xu ₃ , Peiyong Ma ₁ , Liangyuan Jia ₂

Affiliation

The aim of this study is to understand the homogeneous vapor-phase reactions in lignocellulosic biomass pyrolysis by using two separated reactors combined with an advanced analytical technique. The fast pyrolysis of elm was conducted in a microfluidized-bed reactor (MFBR) at 500 °C. The formed pyrolysis tar would be immediately introduced into a secondary tubular reactor (STR), in which the secondary reactions occurred and their product components were monitored by a photoionization mass spectrometry in real time. The mass yields of solids, condensables, and gases with different secondary reactions were measured. Meanwhile, the aerosol particles (>2.0 μm) were collected and their components that can be dissolved in methanol were characterized by GC–MS/FID. The results show that secondary reactions became active only when the temperature was higher than 500 °C. Temperature and residence time (RT) have a combined effect on secondary reactions (e.g., mass balance, tar composition, etc.) and the formation of polycyclic aromatic hydrocarbons (PAHs). The temperature is critical to the secondary reactions, in which, however, the long RT would contribute to decreasing the required temperature and to the formation of large PAHs. Furthermore, the possible routes for PAHs formation were proposed and the reaction conditions that impact them are also discussed.

中文翻译：

通过光电离质谱法了解生物质热解过程中初级焦油的均相反应

这项研究的目的是通过使用两个分离的反应器结合先进的分析技术来了解木质纤维素生物质热解过程中的均相气相反应。榆木的快速热解是在500°C的微流化床反应器（MFBR）中进行的。形成的热解焦油将立即引入二级管式反应器（STR），在其中发生二级反应，并通过光电离质谱法实时监测其产物成分。测量了具有不同副反应的固体，可冷凝物和气体的质量产率。同时，收集了大于2.0μm的气溶胶颗粒，并通过GC-MS / FID对可溶于甲醇的组分进行了表征。结果表明，只有当温度高于500°C时，副反应才起作用。温度和停留时间（RT）对次级反应（例如质量平衡，焦油成分等）和多环芳烃（PAHs）的形成具有综合影响。温度对二次反应至关重要，但是，长时间的RT将有助于降低所需的温度并形成较大的PAH。此外，提出了形成多环芳烃的可能途径，并讨论了影响它们的反应条件。温度对二次反应至关重要，但是，长时间的RT将有助于降低所需的温度并形成较大的PAH。此外，提出了形成多环芳烃的可能途径，并讨论了影响它们的反应条件。温度对二次反应至关重要，但是，长时间的RT将有助于降低所需的温度并形成较大的PAH。此外，提出了形成多环芳烃的可能途径，并讨论了影响它们的反应条件。

更新日期：2020-10-16

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