现代化工

现代化工 ›› 2023, Vol. 43 ›› Issue (3) : 98-105,111. DOI: 10.16606/j.cnki.issn0253-4320.2023.03.019

科研与开发

不同A位取代Co基尖晶石纳米线阵列的合成及其催化碳烟消除的研究

杨华, 杨幸川, 徐丽, 曹春梅, 刘国际

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Synthesis of nanowire arrays of A-site substituted Co-spinel and uses in catalytic elimination of soot

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摘要

采用水热法在泡沫镍基底上成功合成了3种A位取代的钴基尖晶石纳米线阵列催化剂（MCo-NW，M为Mn、Fe和Ni）用于催化消除碳烟。泡沫镍的三维大孔和纳米线之间的交叉大孔不仅降低了气体传质阻力，而且提高了催化剂和碳烟之间的接触效率。此外，Mn、Fe和Ni对Co₃O₄中A位的取代不仅提高了催化剂的氧化还原能力，而且加快了表面氧空位的生成和表面吸附氧的活化。因此，MCo-NW比Co-NW的催化碳烟性能更高，其中MnCo-NW因具有最多的高活性吸附氧物种和最高的氧化还原能力，从而表现出最高的碳烟催化活性。在NO/O₂/N₂气氛中，MnCo-NW的T₁₀为290℃，T₅₀为379℃，选择性为100%。

Abstract

Three kinds of A-site substituted cobalt-based spinel nanowire array catalysts (MCo-NW,where M is Mn,Fe or Ni) are successfully prepared on Ni foam via hydrothermal method,and applied for catalytic soot oxidation.Three-dimensional macroporous structure of Ni foam and the crossed macropores between nanowires reduce the gas mass transfer resistance,and also enhance contact efficiency between catalyst and soot.Additionally,the substitution of Mn,Fe or Ni for A site in Co₃O₄ improves the redox ability of the catalyst and also accelerates the formation of surface oxygen vacancies and the activation of surface adsorbed oxygen.Thus,MCo-NW has higher catalytic performance in catalytic elimination of soot than Co-NW.MnCo-NW exhibits the highest performance for catalytic combustion of soot due to its most active oxygen species and highest redox properties among MCo-NW.In NO/O₂/N₂ atmosphere,T₁₀,T₅₀ and the selectivity of MnCo-NW in catalytic combustion of soot is 290℃,379℃ and 100%,respectively.