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On the Role of Sn Segregation of Pt-Sn Catalysts for Propane Dehydrogenation

机译：对丙烷脱氢的Pt-Sn催化剂Sn偏析的作用

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摘要

Bimetallic nanoparticle catalysts attract extensive attention for relevant catalysis processes due to their flexible structures, while the structure evolution under specific conditions is ambiguous. This paper describes the structure evolution of Pt-Sn bimetallic nanoparticles for catalytic dehydrogenation, especially Sn segregation for surface recovery of a Pt-Sn alloy. An acid etching-reduction process was adopted to investigate the migration of Sn atoms after surface Sn species loss. By acid etching, Sn atoms at the surface of Pt-Sn alloy nanoparticles were removed, leaving nanoparticles with a Pt-rich shell and an unchanged Pt3Sn alloy core. Excitedly, during the following reduction process, the Pt3Sn alloy surface was recovered due to the migration of Sn atoms from the core to the surface, as confirmed by transmission electron microscopy, quasi in situ X-ray photoelectron spectroscopy, and density functional theory calculations. Subsequent studies on the catalyst performance for propane dehydrogenation (PDH) showed that the recoverable Pt3Sn alloy surface structure contributed to the high efficiency with 92% propene selectivity even after 5 cycles of the acid etchingreduction procedure. The recovery of the Pt-Sn alloy through Sn segregation could enable catalysts to overcome component fluctuations, making an efficient catalytic process.
机译：None

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  • 来源
    《ACS catalysis》 |2021年第8期|共10页
  • 作者

    Wang Jieli; Chang Xin; Chen Sai; Sun Guodong; Zhou Xiaohong; Vovk Evgeny; Yang Yong; Deng Wanyu; Zhao Zhi-Jian; Mu Rentao; Pei Chunlei; Gong Jinlong;

  • 作者单位

    Tianjin Univ Sch Chem Engn &

    Technol Minist Educ Key Lab Green Chem Technol Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Minist Educ Key Lab Green Chem Technol Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Minist Educ Key Lab Green Chem Technol Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Minist Educ Key Lab Green Chem Technol Tianjin 300072 Peoples R China;

    ShanghaiTech Univ Sch Phys Sci &

    Technol Shanghai 201210 Peoples R China;

    ShanghaiTech Univ Sch Phys Sci &

    Technol Shanghai 201210 Peoples R China;

    ShanghaiTech Univ Sch Phys Sci &

    Technol Shanghai 201210 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Minist Educ Key Lab Green Chem Technol Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Minist Educ Key Lab Green Chem Technol Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Minist Educ Key Lab Green Chem Technol Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Minist Educ Key Lab Green Chem Technol Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Minist Educ Key Lab Green Chem Technol Tianjin 300072 Peoples R China;

  • 收录信息
  • 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

    Pt-Sn catalysts; alloy surface; segregation; propane dehydrogenation; selectivity;

    机译：Pt-Sn催化剂;合金表面;偏析;丙烷脱氢;选择性;

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