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首页> 外文期刊>Catalysis Letters >Hydrodechlorination of Chlorobenzene Over Ni2P/SiO2 Catalysts: Influence of Ni2P Loading
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Hydrodechlorination of Chlorobenzene Over Ni2P/SiO2 Catalysts: Influence of Ni2P Loading

机译：Ni2 P / SiO2 催化剂上氯苯的加氢脱氯：Ni2 P负载的影响

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摘要

The influence of Ni2P loading on the properties of Ni2P/SiO2 catalysts was investigated by means of N2 adsorption–desorption, X-ray diffraction, H2 and NH3 temperature-programmed desorption, CO chemisorption, inductively coupled plasma atomic emission spectroscopy and activity evaluation for the hydrodechlorization of chlorobenzene. It was found that increasing Ni2P loading results in the decrease of Ni2P dispersion. Higher P/Ni ratio occurs in the catalysts with lower Ni2P loadings, indicating that smaller Ni2P crystallites may more strongly interact with surplus P. We suggest that the acid amount of the Ni2P/SiO2 catalyst is related to the exposed Ni sites and P-OH groups, while Br?nsted acidity of P-OH groups facilitates hydrogen spillover. Increasing Ni2P loading is favorable to the catalyst activity, while this effect is not obvious when the Ni2P loading is greater than 9.6 wt%. Apart from the metallic property of Ni2P phase and spilt-over hydrogen species, we propose that the acidity and the role of P in activating reactants should be considered for the catalyst performance.
机译：通过N2 吸附-解吸，X射线衍射，H2 研究了Ni2 P负载量对Ni2 P / SiO2 催化剂性能的影响。和NH3 程序升温脱附，CO化学吸附，电感耦合等离子体原子发射光谱法和氯苯加氢脱氯活性评估。研究发现，增加Ni2 P的负载量会导致Ni2 P分散性的降低。 Ni / P含量较低的催化剂中存在较高的P / Ni比值，表明较小的Ni2 微晶可能与剩余P相互作用更强。我们认为Ni2 的酸量P / SiO2 催化剂与暴露的Ni位点和P-OH基团有关，而P-OH基团的布朗斯台德酸度有助于氢的溢出。 Ni 2 P负载量的增加有利于催化剂的活性，而当Ni 2 P负载量大于9.6wt％时，该效果不明显。除了Ni2 相的金属性质和氢的扩散特性外，我们建议应考虑酸度和P在活化反应物中的作用以提高催化剂的性能。

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  • 来源
    《Catalysis Letters》 |2009年第4期|346-353|共8页
  • 作者

    Jixiang Chen; Lingmin Sun; Rijie Wang; Jiyan Zhang;

  • 作者单位

    Tianjin Key Laboratory of Applied Catalysis Science and Technology Department of Catalysis Science and Engineering School of Chemical Engineering and Technology Tianjin University 300072 Tianjin China;

    Tianjin Key Laboratory of Applied Catalysis Science and Technology Department of Catalysis Science and Engineering School of Chemical Engineering and Technology Tianjin University 300072 Tianjin China;

    Tianjin Key Laboratory of Applied Catalysis Science and Technology Department of Catalysis Science and Engineering School of Chemical Engineering and Technology Tianjin University 300072 Tianjin China;

    Tianjin Key Laboratory of Applied Catalysis Science and Technology Department of Catalysis Science and Engineering School of Chemical Engineering and Technology Tianjin University 300072 Tianjin China;

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  • 正文语种 eng
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  • 关键词

    Nickel phosphide; Hydrodechlorination; Chlorobenzene; Acidity; Spilt-over hydrogen;

    机译：磷化镍;加氢脱氯;氯苯;酸度;溢氢;

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