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首页> 外文期刊>Environmental Science & Technology >Molecular Characterization of the Gas-Particle Interface of Soot Sampled from a Diesel Engine Using a Titration Method
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Molecular Characterization of the Gas-Particle Interface of Soot Sampled from a Diesel Engine Using a Titration Method

机译：滴定法测定柴油机烟尘气体颗粒界面的分子特征

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摘要

Surface functional groups of two different types of combustion aerosols, a conventional diesel (EN 590) and a hydrotreated vegetable oil (HVO) soot, have been investigated using heterogeneous chemistry (i.e., gas-particle surface reactions). A commercial sample of amorphous carbon (Printer XE2-B) was analyzed as a reference substrate. A Knudsen flow reactor was used to carry out the experiments under molecular flow conditions. The selected gases for the titration experiments were: N(CH_3)_3 for the identification of acidic sites, NH_2OH for the presence of caibonyl groups, CF_3COOH and HCl for basic sites of different strength, and O_3 and NO_2 for reducing groups. Reactivity with N(CH_3)_3 indicates a lower density of acidic functionalities for Printex XE2-B in relation to diesel and HVO soot Results for NH_2OH experiments indicates that commercial amorphous carbon exhibits a lower abundance of available carbonyl groups at the interface compared to the results from diesel and HVO soot, the latter being the one with the largest abundance of carbonyl functions. Reactions with adds indicate the presence of weak basic oxides on the particle surface that preferentially interact with the strong add CF_3COOH. Finally, reactions with O_3 and NO_2 reveal that diesel and especially HVO have a significantly higher reactivity with both oxidizers compared to that of Printex XE2-B because they have more reducing sites by roughly a factor of 10 and 30, respectively. The kinetics of titration reactions have also been investigated.
机译：已使用非均相化学方法（即气体颗粒表面反应）研究了两种不同类型的燃烧气溶胶的表面官能团，即常规柴油（EN 590）和加氢处理的植物油（HVO）烟灰。分析了无定形碳的商业样品（打印机XE2-B）作为参考底物。使用克努森流动反应器在分子流动条件下进行实验。用于滴定实验的选定气体为：N（CH_3）_3用于鉴定酸性位点，NH_2OH用于存在caibonyl基团，CF_3COOH和HCl用于不同强度的碱性位点，O_3和NO_2用于还原基团。与N（CH_3）_3的反应性表明Printex XE2-B的酸性官能度相对于柴油和HVO烟灰的密度较低。NH_2OH实验的结果表明，与结果相比，商用无定形碳在界面处的可用羰基含量较低由柴油和HVO烟灰组成，后者是羰基功能最丰富的一种。与添加物的反应表明，颗粒表面存在弱碱性氧化物，它们优先与强添加物CF_3COOH相互作用。最后，与O_3和NO_2的反应表明，与Printex XE2-B相比，柴油，尤其是HVO与两种氧化剂的反应性都高得多，因为它们的还原位分别约为10和30倍。还研究了滴定反应的动力学。

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  • 来源
    《Environmental Science & Technology》 |2016年第6期|2946-2955|共10页
  • 作者

    A. Tapia; M. S. Salgado; Maria Pilar Martin; M. Lapuerta; J. Rodriguez-Fernandez; M J. Rossi; B. Cabanas;

  • 作者单位

    Departamento de Quimica Fisica, Facultad de Ciencias y Tecnologias Quimicas, Universidad de Castilla La Mancha, Avda. Camilo Jose Cela s, 13071 Ciudad Real, Spain;

    Departamento de Quimica Fisica, Facultad de Ciencias y Tecnologias Quimicas, Universidad de Castilla La Mancha, Avda. Camilo Jose Cela s, 13071 Ciudad Real, Spain;

    Departamento de Quimica Fisica, Facultad de Ciencias y Tecnologias Quimicas, Universidad de Castilla La Mancha, Avda. Camilo Jose Cela s, 13071 Ciudad Real, Spain;

    Grupo de Combustibles y Motores, Escuela Tecnica Superior de Ingenieros Industriales, Universidad de Castilla la Mancha, Avda. Camilo Jose Cela 10, 13071 Ciudad Real, Spain;

    Grupo de Combustibles y Motores, Escuela Tecnica Superior de Ingenieros Industriales, Universidad de Castilla la Mancha, Avda. Camilo Jose Cela 10, 13071 Ciudad Real, Spain;

    Labor fuer Atmosphaerenchemie (LAC), Paul Scherrer Institute (PSI), OBBA006, CH-S232 Villigen PSI, Switzerland;

    Departamento de Quimica Fisica, Facultad de Ciencias y Tecnologias Quimicas, Universidad de Castilla La Mancha, Avda. Camilo Jose Cela s, 13071 Ciudad Real, Spain;

  • 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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