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首页> 外文期刊>RSC Advances >Propane dehydrogenation over Ce-containing ZSM-5 supported platinum-tin catalysts: Ce concentration effect and reaction performance analysis
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Propane dehydrogenation over Ce-containing ZSM-5 supported platinum-tin catalysts: Ce concentration effect and reaction performance analysis

机译：丙烷脱氢在含CE ZSM-5负载的铂 - 锡催化剂：Ce浓度效应和反应性能分析

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摘要

Ce-containing ZSM-5 zeolites were hydrothermally synthesized and then used as supports for platinum-tin catalysts in propane dehydrogenation. To study the location of the Ce species and the effects of Ce concentration on the catalyst structure, the as-prepared catalysts were characterized by several techniques, including XRD, nitrogen adsorption, SEM, TEM, UV-vis, FT-IR, NH3-TPD, XPS, H-2-TPD, TPR and TPO analyses. It is found that parts of the cerium species can be incorporated into the framework of ZSM-5 zeolites, thus influencing the morphologies and textural properties of the supports. The use of the Ce-modified material promotes the dispersion of metallic particles, improves the catalytic ability to adsorb hydrogen at low temperature and enhances the interaction of Sn species and the support. As a result, the active sites can be stabilized and higher amounts of Sn species exist in oxidative states. Moreover, the substitution of Ce decreases the strength of the weak acidity and facilitates the migration of coke from metal active sites to the support. During the process of reaction, the variation of Ce content mainly affects the occurrence of hydrogenolysis and hydrogenation side reactions. In the present work, the optimal content of Ce in the support is 0.76 wt%, which results in the highest reaction activity and the stability in the reaction of propane dehydrogenation.
机译：ZSM-5沸石含Ce的水热合成，然后用作在丙烷脱氢铂 - 锡催化剂载体。为了研究Ce的物种的位置和Ce的浓度对催化剂结构的影响，所制备的催化剂进行了表征通过几种技术，包括XRD，氮吸附，SEM，TEM，UV-VIS，FT-IR，NH 3 TPD，XPS，H-2-TPD，TPR和TPO分析。据发现，铈物种的部件可以结合到ZSM-5沸石的框架，从而影响形貌和支撑的结构性质。使用铈改性的材料的促进金属粒子的分散性，提高了在低温下的催化能力，以吸附氢，增强的Sn物种和支撑的相互作用。其结果是，活性部位可以稳定在氧化状态存在较高量的锡物种。此外，Ce的置换减少了弱酸性的强度并有利于焦炭从金属活性部位至支撑迁移。在反应的过程中，Ce的含量的变化主要影响氢解和氢化副反应的发生。另外，在本工作中，铈在支撑的最佳含量为0.76％（重量），这导致最高的反应活性和在丙烷脱氢反应中的稳定性。

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  • 来源
    《RSC Advances》 |2016年第35期|共13页
  • 作者

    Zhang Yiwei; Xue Mengwei; Zhou Yuming; Zhang Hongxing; Wang Wen; Wang Qianli; Sheng Xiaoli;

  • 作者单位

    Southeast Univ Sch Chem &

    Chem Engn Nanjing 211189 Jiangsu Peoples R China;

    Nanjing Xiaozhuang Univ Biochem &

    Environm Engn Coll Nanjing 211171 Jiangsu Peoples R China;

    Southeast Univ Sch Chem &

    Chem Engn Nanjing 211189 Jiangsu Peoples R China;

    Southeast Univ Sch Chem &

    Chem Engn Nanjing 211189 Jiangsu Peoples R China;

    Southeast Univ Sch Chem &

    Chem Engn Nanjing 211189 Jiangsu Peoples R China;

    Southeast Univ Sch Chem &

    Chem Engn Nanjing 211189 Jiangsu Peoples R China;

    Southeast Univ Sch Chem &

    Chem Engn Nanjing 211189 Jiangsu Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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