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首页> 外文期刊>Applied Surface Science >Surface modification of CeO_2 nanoflakes by low temperature plasma treatment to enhance imine yield: Influences of different plasma atmospheres
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Surface modification of CeO_2 nanoflakes by low temperature plasma treatment to enhance imine yield: Influences of different plasma atmospheres

机译：低温等离子体处理CeO_2纳米薄片的表面改性以提高亚胺收率：不同等离子体气氛的影响

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摘要

Solvothermal synthesized CeO2 nanoflakes were plasma treated under different atmospheres (combination of Ar, H-2, O-2 and NH3), and further used for imine synthesis. The plasma processing can improve the amount of surface oxygen vacancies, Ce-3(+) ratio, and the peroxy anions O-2(2-) ratio. All the three parameters can influence the CeO2 catalytic ability of imine conversion to different extent. The plasma with working gas of H-2 and/or O-2 can increase the peroxy anions O-2(2-) ratio greatly (from 3.14% to about 40%), while the reducing condition (Ar + H-2 and Ar + NH3 as working gas) can significantly improve the Ce-3(+) ratio (similar to 28.54%) and the surface oxygen vacancies. The reaction rate of imine synthesis can be improved up to 75% of the pristine CeO2 when Ar + H-2 mixture gas was used as the plasma atmosphere. The amount of CeO2 surface oxygen vacancies is the most important parameter for imine conversion. The enhancement of catalytic ability can be mainly attributed to the improved surface oxygen vacancies and the Ce-3(+) ratio, and slightly to the rising of peroxy anions O-2(2-) ratio, although the value of the last parameter increased most.
机译：溶剂热合成的CeO2纳米片在不同的气氛（Ar，H-2，O-2和NH3的组合）下进行等离子体处理，并进一步用于亚胺合成。等离子体处理可以提高表面氧空位的数量，Ce-3（+）比率和过氧阴离子O-2（2-）比率。这三个参数均可在不同程度上影响亚胺转化的CeO2催化能力。具有H-2和/或O-2的工作气体的等离子体可以大大提高过氧阴离子O-2（2-）的比例（从3.14％增加到大约40％），而还原条件（Ar + H-2和Ar + NH3作为工作气体）可以显着提高Ce-3（+）比率（约28.54％）和表面氧空位。当使用Ar + H-2混合气体作为等离子体气氛时，亚胺合成的反应速率可提高至原始CeO2的75％。 CeO2表面氧空位的数量是亚胺转化的最重要参数。催化能力的提高主要归因于表面氧空位和Ce-3（+）比例的提高，而过氧化阴离子O-2（2-）比例的提高则略有增加，尽管最后一个参数的值增加了最。

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  • 来源
    《Applied Surface Science》 |2018年第1期|173-180|共8页
  • 作者

    Yang Jingxia; Ding Huihui; Zhu Zhu; Wang Qiuhe; Wang Jinjie; Xu Jingli; Chang Xijiang;

  • 作者单位

    Shanghai Univ Engn Sci, Coll Chem & Chem Engn, LongTeng Rd 333, Shanghai 201620, Peoples R China;

    Shanghai Univ Engn Sci, Coll Chem & Chem Engn, LongTeng Rd 333, Shanghai 201620, Peoples R China;

    Shanghai Univ Engn Sci, Coll Elect & Elect Engn, LongTeng Rd 333, Shanghai 201620, Peoples R China;

    Shanghai Univ Engn Sci, Coll Elect & Elect Engn, LongTeng Rd 333, Shanghai 201620, Peoples R China;

    Shanghai Univ Engn Sci, Coll Chem & Chem Engn, LongTeng Rd 333, Shanghai 201620, Peoples R China;

    Shanghai Univ Engn Sci, Coll Chem & Chem Engn, LongTeng Rd 333, Shanghai 201620, Peoples R China;

    Shanghai Univ Engn Sci, Coll Elect & Elect Engn, LongTeng Rd 333, Shanghai 201620, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CeO2; Plasma; Catalyst; Surface modification; Imine synthesis;

    机译：CeO2;等离子体;催化剂;表面修饰;亚胺合成;

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