Diesel Soot Combustion over Mn2 O3 Catalysts with Different Morphologies: Elucidating the Role of Active Oxygen Species in Soot Combustion.,Chemistry - An Asian Journal

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Diesel Soot Combustion over Mn2 O3 Catalysts with Different Morphologies: Elucidating the Role of Active Oxygen Species in Soot Combustion.
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-05-12 , DOI: 10.1002/asia.202000461
Yasutaka Kuwahara _{1,

2,

3} , Genki Kato ₁ , Akihiro Fujibayashi ₁ , Kohsuke Mori _{1,

2} , Hiromi Yamashita _{1,

2}

Affiliation

Catalytic diesel soot combustion was examined using a series of Mn₂O₃ catalysts with different morphologies, including plate, prism, hollow spheres and powders. The plate‐shaped Mn₂O₃ (Mn₂O₃‐plate) exhibited superior carbon soot combustion activity compared to the prism‐shaped, hollow‐structured and powdery Mn₂O₃ under both tight and loose contact modes at soot combustion temperatures (T ₅₀) of 327 °C and 457 °C, respectively. Comprehensive characterization studies using scanning electron microscopy, scanning transmission electron microscopy, X‐ray diffraction, X‐ray photoelectron spectroscopy, temperature‐programmed reduction and oxygen release measurements, revealed that the improved activity of Mn₂O₃‐plate was mainly attributed to the high oxygen release rate of surface‐adsorbed active oxygen species, which originated from oxygen vacancy sites introduced during the catalyst preparation, rather than specific surface‐exposed planes. The study provides new insights for the design and synthesis of efficient oxidation catalysts for carbon soot combustion as well as for other oxidation reactions of harmful hydrocarbon compounds.

中文翻译：

具有不同形态的Mn2 O3催化剂上的柴油烟ot燃烧：阐明了活性氧在烟ot燃烧中的作用。

使用一系列具有不同形态的Mn ₂ O ₃催化剂，包括板状，棱柱状，空心球状和粉末状，对催化柴油机烟ot燃烧进行了研究。板状的Mn ₂ O ₃（Mn ₂ O ₃板）在烟尘燃烧温度下（紧密和松散的接触方式）下均比棱柱形，空心结构和粉状Mn ₂ O ₃表现出优异的碳烟燃烧活性（T ₅₀）分别为327°C和457°C。使用扫描电子显微镜，扫描透射电子显微镜，X射线衍射，X射线光电子能谱，程序升温还原和氧释放测量进行的全面表征研究表明，Mn ₂ O ₃平板活性的提高主要归因于表面吸附的活性氧种类的高氧释放速率，这是由于催化剂制备过程中引入的氧空位而不是特定的表面暴露平面。该研究为碳烟燃烧以及有害烃化合物的其他氧化反应的有效氧化催化剂的设计和合成提供了新的见识。

更新日期：2020-07-01

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