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首页> 外文期刊>Environmental Science & Technology >Investigation of Mechanisms of Polycyclic Aromatic Hydrocarbons (PAHs) Initiated from the Thermal Degradation of Styrene Butadiene Rubber (SBR) in N_2 Atmosphere
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Investigation of Mechanisms of Polycyclic Aromatic Hydrocarbons (PAHs) Initiated from the Thermal Degradation of Styrene Butadiene Rubber (SBR) in N_2 Atmosphere

机译:N_2气氛中丁苯橡胶(SBR)热降解引发多环芳烃(PAHs)机理的研究

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This study has been carried out to characterize the thermal decomposition of styrene-butadiene rubber (SBR), using thermo-gravimetric analysis (TGA) coupled to online GC/MS, and to investigate the formation and ultimate fate of chemical species produced during gasification of SBR. A preliminary mechanistic understanding has been developed to explain the formation and relationship of light hydrocarbons (C_1-C_4), substituted aromatics, and polycyclic aromatic hydrocarbons (PAHs) during the decomposition of SBR in a N_2 atmosphere. Identification and absolute concentrations of over 50 major and minor species (from hydrogen to benzo[ghi]perylene) have been established, and the measurements have been carried out between 300 and 500 at 10 ℃/min heating rate in a N_2 atmosphere. The concentration of styrene reached 120 PPMVandthe concentration of other substituted aromatics, such as toluene and ethyl benzene reached 20 and; 5 PPMV, respectively. These measurements indicate PAH formation at a relatively lower temperature as compared to conventional fuel, such as coal and diesel. The PAH sequence is not simply the constructing of larger PAHs from smaller ones to achieve the complex polymer structures. It is possible to generate large PAH molecules while circumventing the typical construction pathway.
机译:这项研究已进行了表征,使用热重分析(TGA)与在线GC / MS结合,表征了丁苯橡胶(SBR)的热分解,并研究了气化过程中产生的化学物种的形成和最终命运SBR。已经建立了初步的机理理解,以解释在N_2气氛中SBR分解过程中轻烃(C_1-C_4),取代的芳烃和多环芳烃(PAHs)的形成和关系。已经建立了超过50种主要和次要种类(从氢到苯并[)的鉴定和绝对浓度,并且已在N_2气氛中以10℃/ min的加热速率在300至500之间进行了测量。苯乙烯的浓度达到120 PPMV,其他取代的芳族化合物,例如甲苯和乙苯的浓度达到20和。 5个PPMV。这些测量结果表明,与常规燃料(例如煤和柴油)相比,PAH的形成温度相对较低。 PAH序列不仅仅是从较小的PAH构造较大的PAH以获得复杂的聚合物结构。在规避典型的构建途径的同时,可能会生成大量的PAH分子。

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  • 来源
    《Environmental Science & Technology》 |2008年第6期|2175-2180|共页
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  • 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);美国《化学文摘》(CA);
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  • 正文语种 eng
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