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首页> 外文期刊>ACS catalysis >Formation Mechanism of the Co2C Nanoprisms Studied with the CoCe System in the Fischer–Tropsch to Olefin Reaction
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Formation Mechanism of the Co2C Nanoprisms Studied with the CoCe System in the Fischer–Tropsch to Olefin Reaction

机译：CO2C纳米素质的形成机制与Fischer-Tropsch中的CoCE系统研究过烯烃反应

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摘要

Cobalt carbide (Co_(2)C) nanoprisms are efficient for olefin production via Fischer–Tropsch to olefin (FTO) reaction. However, these Co_(2)C nanoprisms can only be prepared from the given CoMn composite oxide precursor with a sodium promoter and the formation mechanism remains ambiguous up to now. In the present work, the Ce-stabilized spherical Co nanoparticles were synthesized and were used as a precursor to study the formation mechanism of the active phase. The experimental results and theoretical analysis showed that Ce promoters were favorable to provide oxygen to the dangling bonds of the surface Co sites. The coordination of the surface Co sites and the Ce promoters reduced the surface energy of the Co_(2)C nanostructures, resulting in different growth rates of the Co_(2)C crystal in various orientations. Such effects facilitated the formation of the Co_(2)C with specific exposed facets. Combining the abovementioned findings with the different morphologies of the intermediates, a seven-step formation process of Co_(2)C nanoprisms was proposed. As a result, it exhibited that the transition from the Co_(2)C nanospheres to the Co_(2)C nanoprisms was enhanced by increasing the Ce content, leading to a decrease in the CH_(4) and paraffin selectivities and an increase in the C 2–4) =) selectivity and olefin/paraffin ratio.
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  • 来源
    《ACS catalysis》 |2021年第5期|共8页
  • 作者

    Zhengjia Li; Danmeng Yu; Linyan Yang; Jie Cen; Kang Xiao; Nan Yao; Xiaonian Li;

  • 作者单位

    Institute of Industrial Catalysis College of Chemical Engineering Zhejiang University of Technology;

    Institute of Industrial Catalysis College of Chemical Engineering Zhejiang University of Technology;

    Institute of Industrial Catalysis College of Chemical Engineering Zhejiang University of Technology;

    Institute of Industrial Catalysis College of Chemical Engineering Zhejiang University of Technology;

    School of Materials Science and Engineering Nanjing University of Posts and Telecommunications;

    Institute of Industrial Catalysis College of Chemical Engineering Zhejiang University of Technology;

    Institute of Industrial Catalysis College of Chemical Engineering Zhejiang University of Technology;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 物理化学（理论化学）、化学物理学;
  • 关键词

    Fischer?Tropsch; Colt; subgt; 2lt; /subgt; C; ceria; formation mechanism; structure-sensitive effect;

    机译：Fischer？Tropsch;Co＆lt;亚＆gt;2＆lt;/ sub＆gt;c;ceria;形成机制;结构敏感效果;

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