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首页> 外文期刊>Catalysis for Sustainable Energy >Synthesis, physicochemical and catalytic properties of Ni/PrCeZrO catalysts for water-gas shift reaction
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Synthesis, physicochemical and catalytic properties of Ni/PrCeZrO catalysts for water-gas shift reaction

机译：Ni / PrCeZrO催化剂的合成，理化及催化性能

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摘要

Mixed nanocrystalline ceria-zirconia oxides doped with praseodymium containing 5, 7.5, 10, and 12.5 wt. % nickel were prepared by the incipient wetness impregnation of the oxide support. Complex physicochemical characterization by X-ray diffraction analysis, ultraviolet-visible diffuse reflectance spectroscopy, high resolution transmission electron microscopy and Fourier-transform infrared spectroscopy of adsorbed CO revealed that the nickelcontaining samples are comprised of a solid solution of praseodymium, cerium and zirconium oxides with the fluorite structure as well as nickel oxide particles with a size up to 100 nm. All prepared nanocomposite catalysts show a high catalytic activity in the water-gas shift reaction. The optimum content of nickel in the catalyst providing the maximum activity was found to be 10 wt. %. A high oxygen mobility in these catalysts estimated by the temperature-programmed oxygen isotope heteroexchange with C18O2 provides required coking stability. To eliminate local overheating of the catalyst and decrease the pressure drop in the reactor, as required for further up-scaling, the active component was supported on a metal plate made of Ni-Al foam alloy. At a fixed contact time, the same level of CO conversion with a fraction of the active component was achieved with an approximately 50 wt% loading on the support.
机译：掺有5、7.5、10和12.5 wt。％ase的混合纳米晶态氧化铈-氧化锆氧化物通过初始润湿浸渍氧化物载体制备％镍。通过X射线衍射分析，紫外可见漫反射光谱，高分辨率透射电子显微镜和傅立叶变换红外光谱对吸附的CO进行复杂的物理化学表征，结果表明，含镍样品由of，铈和锆的氧化物固溶体组成，萤石结构以及最大尺寸为100 nm的氧化镍颗粒。所有制备的纳米复合催化剂在水煤气变换反应中均显示出高催化活性。发现提供最大活性的催化剂中镍的最佳含量为10重量％。 ％。通过温度编程的氧同位素与C18O2的交换估计，这些催化剂中的高氧迁移率可提供所需的焦化稳定性。为了消除催化剂的局部过热并减小反应器中的压降（如进一步放大所需），将活性成分负载在由Ni-Al泡沫合金制成的金属板上。在固定的接触时间，在载体上负载约50 wt％的情况下，可以得到一部分活性成分的相同水平的CO转化率。

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