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Pelletized Cu-Ni/CePr5 catalysts for H_2 purification via Water Gas Shift reaction

机译：通过水煤气变换反应造粒用于H_2纯化的粒化Cu-Ni / CePr5催化剂

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摘要

Water Gas Shift (WGS) reaction recently gained attraction as a purifying method to remove CO in H-2 stream produced from bio-alcohols reforming for fuel cells applications. In previous works, we tested Cu-Ni samples supported on Pr promoted ceria as catalysts for WGS reaction. However, powder samples are not recommended for a scale-up process and ceria samples lack of cohesive forces to obtain a pellet. Then, supported catalysts can be an interesting alternative to study. In the present work, alumina spheres were impregnated in order to replicate the same chemical formulation of powder-state samples. It was studied the influence in catalytic performance of several textural and catalytic features such as: pellet size, active phase content and distribution, Cu:Ni ratio in bimetallic samples, and contact time. The Cu samples showed a moderate activity and the Ni ones a better performance, but tendency to generate CH4. For all catalysts, the decrease in the pellet size induced a higher CO conversion, indicating strong mass diffusion effects. Besides, it was observed that small addition of Cu to Ni samples significantly moderated the methanation reaction, but maintaining the activity. The change in active metal content slightly modified the activity and changed the selectivity, in agreement with the characterization techniques results (H-2-TPR and OSC). In summary, the sample with Cu:Ni ratio equal to 1:2 with 1.5 wt%, presented a great performance, by removing 8 to 2 %v/v of CO with an acceptable contact time and high selectivity, being the most promissory catalyst for higher scale tests.
机译：水煤气变换（WGS）反应最近获得了从生物醇改性的H-2流中除去燃料电池应用的H-2流中的纯化方法的吸引力。在以前的作用中，我们测试了PR支持的Cu-Ni样品，促进Ceria作为WGS反应的催化剂。然而，不建议粉末样品用于扩大尺度过程，并且有铈样品缺乏内聚力以获得颗粒。然后，支持的催化剂可以是学习的有趣替代品。在本作工作中，浸渍氧化铝球以复制相同的粉末状态样品的化学制剂。研究了几种纹理和催化特征的催化性能的影响，例如：颗粒尺寸，活性相含量和分布，Cu：Ni比例在双金属样品中，以及接触时间。 Cu样品显示出中等的活性和Ni系列的性能更好，但产生CH4的趋势。对于所有催化剂，颗粒尺寸的降低诱导较高的CO转化，表明具有强烈的质量扩散效应。此外，观察到少量加入Ni样品显着调节甲烷化反应，但保持活性。活性金属含量的变化略微修改活动并改变了选择性，同时与表征技术结果（H-2-TPR和OSC）一致。总之，具有Cu：Ni比例等于1：2的含量为1.5wt％，呈现出具有可接受接触时间和高选择性的8至2％V / V的CO的性能，是最累积的催化剂对于更高级别的测试。

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  • 来源
    《Fuel》 |2020年第jul1期|117653.1-117653.9|共9页
  • 作者

    Poggio-Fraccari E.; Bader G.; Alemany Luis; Marino F.;

  • 作者单位

    UBA CONICET Pabellon Ind ITHES Ciudad Univ RA-1428 Buenos Aires DF Argentina;

    UBA CONICET Pabellon Ind ITHES Ciudad Univ RA-1428 Buenos Aires DF Argentina;

    Univ Malaga Fac Ciencias Dept Ingn Quim E-29071 Malaga Spain;

    UBA CONICET Pabellon Ind ITHES Ciudad Univ RA-1428 Buenos Aires DF Argentina;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    WGS; Pellets; Alumina spheres; Cu; Ni;

    机译：WGS;颗粒;铝球;用;ni;

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