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Mesoporous NiCu-CeO2 oxide catalysts for high-temperature water-gas shift reaction

机译:高温尼古尔 - CeO2氧化物催化剂,用于高温水 - 气体变换反应

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摘要

Mesoporous NiCu-CeO2 oxide catalysts were synthesized by using the evaporation-induced self-assembly method applied to the high-temperature, water-gas shift reaction (HT-WGS) between 350 to 550 degrees C. Nickel and copper loadings on mesoporous ceria were tailored to achieve high activity and selectivity by suppressing methane formation in HT-WGS. Among the prepared catalysts, NiCu(1 : 4)-CeO2 exhibited the highest selectivity to CO2 and H-2 with 85% CO conversion at a very high GHSV of 83 665 h(-1). The higher activity of the catalysts was due to the mesoporous architecture, which provides more accessible active sites for the WGS reaction. Powder X-ray diffraction (XRD), small angle X-ray scattering (SAXS), N-2-adsorption/desorption isotherm, high-resolution transmission electron microscopy (HR-TEM), and H-2-temperature-programmed reduction (TPR) techniques were used to understand the role of mesoporosity and bimetallic composition of various NiCu-CeO2 oxides in enhancing catalytic activity for HT-WGS.
机译:通过使用蒸发的诱导的自组装方法合成介孔的Nicu-CeO 2氧化物催化剂,其在高温,水 - 气体移位(HT-WG)之间的350至550℃之间的镍和铜载体上的蒸发诱导的自组装方法合成通过抑制HT-WGS中的甲烷形成来定制以实现高活性和选择性。在制备的催化剂中,NicU(1:4)-CEO 2对CO 2和H-2的选择性最高,在83 665小时(-1)的非常高的GHSV下,85%CO转化。催化剂的较高活性是由于介孔的建筑,为WGS反应提供了更易于的活性位点。粉末X射线衍射(XRD),小角度X射线散射(SAX),N-2吸附/解吸等温,高分辨率透射电子显微镜(HR-TEM)和H-2温度编程的减少( TPR)技术用于了解各种Nicu-CeO2氧化物的中间孔隙度和双金属组成的作用,提高HT-WG的催化活性。

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  • 来源
    《RSC Advances》 |2015年第2期|共8页
  • 作者单位

    Yonsei Univ Dept Environm Engn Wonju 220710 Gangwon South Korea;

    Yonsei Univ Dept Environm Engn Wonju 220710 Gangwon South Korea;

    Yonsei Univ Dept Environm Engn Wonju 220710 Gangwon South Korea;

    CSIR Natl Chem Lab Chem Engn &

    Proc Dev Div Pune 411008 Maharashtra India;

    Yonsei Univ Dept Environm Engn Wonju 220710 Gangwon South Korea;

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  • 正文语种 eng
  • 中图分类 化学;
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