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首页> 外文期刊>Environmental Science & Technology >Sphere-Shaped Mn_3O_4 Catalyst with Remarkable Low-Temperature Activity for Methyl-Ethyl-Ketone Combustion
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Sphere-Shaped Mn_3O_4 Catalyst with Remarkable Low-Temperature Activity for Methyl-Ethyl-Ketone Combustion

机译:具有明显低温活性的球状Mn_3O_4催化剂,用于甲基-乙基-酮燃烧

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摘要

Mn_3O_4 FeMnO_x and FeO_x catalysts synthesized via a solvothermal method were employed for catalytic oxidation of methyl-ethyl-ketone (MEK) at low temperature. Mn_3O_4 with sphere-like morphology exhibited the highest activity for MEK oxidation, over which MEK was completely oxidized to CO2 at 200 ℃, and this result can be comparable to typical noble metal loaded catalysts. The activation energy of MEK over Mn_3O_4 (30.8 kf/mol) was much lower than that of FeMnO_x (41.5 kJ/mol) and FeO_x (47.8 kJ/mol). The dominant planes, surface manganese species ratio, surface-absorbed oxygen, and redox capability played important roles in the catalytic activities of catalysts, while no significant correlation was found between specific surface area and MEK removal efficiency. Mn_3O_4 showed the highest activity, accounting for abundant oxygen vacancies, low content of surface Mn~(4+) and strong reducibility. The oxidation of MEK to CO_2 via an intermediate of diacetyl is a reaction pathway on Mn_3O_4 catalyst. Due to high efficiency and low cost, sphere-shaped Mn_3O_4 is a promising catalyst for VOCs abatement.
机译:通过溶剂热法合成的Mn_3O_4 FeMnO_x和FeO_x催化剂在低温下用于甲基乙基酮(MEK)的催化氧化。球形的Mn_3O_4对MEK的氧化具有最高的活性,在此温度下,MEK在200℃被MEK完全氧化成CO2,这一结果可与典型的贵金属负载催化剂相比。 MEK在Mn_3O_4(30.8 kf / mol)上的活化能远低于FeMnO_x(41.5 kJ / mol)和FeO_x(47.8 kJ / mol)。主平面,表面锰物种比率,表面吸收的氧气和氧化还原能力在催化剂的催化活性中起着重要作用,而比表面积与MEK去除效率之间没有显着相关性。 Mn_3O_4的活性最高,说明氧空位丰富,表面Mn〜(4+)含量低,还原性强。通过二乙酰基中间体将MEK氧化为CO_2是Mn_3O_4催化剂上的反应途径。由于高效率和低成本,球形Mn_3O_4是减少VOCs的有前途的催化剂。

著录项

  • 来源
    《Environmental Science & Technology》 |2017年第11期|6288-6297|共10页
  • 作者单位

    Department of Environmental Science and Engineering, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, P.R. China;

    Department of Environmental Science and Engineering, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, P.R. China;

    Department of Environmental Science and Engineering, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, P.R. China;

    Department of Environmental Science and Engineering, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, P.R. China,Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, U.K.;

    Department of Environmental Nano-materials, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences,Beijing 100085, China;

    Department of Environmental Science and Engineering, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, P.R. China;

    Department of Environmental Science and Engineering, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, 710049, P.R. China;

  • 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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