Morphology Effect of Ceria on the Catalytic Performances of Ru/CeO2 Catalysts for Ammonia Synthesis,Industrial & Engineering Chemistry Research

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Morphology Effect of Ceria on the Catalytic Performances of Ru/CeO2 Catalysts for Ammonia Synthesis
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2018-07-09 , DOI: 10.1021/acs.iecr.8b02126
Bingyu Lin ₁ , Yi Liu ₁ , Lan Heng ₁ , Xiuyun Wang ₁ , Jun Ni ₁ , Jianxin Lin ₁ , Lilong Jiang ₁

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Ru/CeO₂ catalysts with different amounts of surface oxygen vacancies were prepared by changing the morphology of CeO₂. The conversion of Ce⁴⁺ to Ce³⁺ and the formation of Ru–O–Ce bonds led to enhancement of the amount of oxygen vacancies. Ru species of low crystallinity enriched with Ru⁴⁺ ions exist on the surface of CeO₂ nanorods, while metallic Ru particles exist on CeO₂ nanocubes. The low crystallinity of Ru species and high concentration of oxygen vacancies enhanced the adsorption of hydrogen and nitrogen and also led to desorption of surface hydrogen in the form of H₂. Therefore, Ru/CeO₂ nanorods showed high ammonia synthesis activities. On the contrary, lower catalytic activity was observed over Ru/CeO₂ nanocubes catalyst because H₂ and N₂ adsorption was less favorable plausibly due to the large particle size of Ru species and low concentration of oxygen vacancies, and most of the hydrogen species were consumed in H₂O formation.

中文翻译：

二氧化铈对Ru / CeO ₂氨合成催化剂催化性能的形态学影响

通过改变CeO ₂的形貌，制备了具有不同表面氧空位的Ru / CeO ₂催化剂。Ce ⁴⁺到Ce ³⁺的转化以及Ru–O–Ce键的形成导致氧空位数量的增加。与钌富集低结晶度的孺物种⁴⁺离子的CeO的表面上存在_2个纳米棒，而在存在的CeO金属钌颗粒₂纳米立方体。Ru物种的低结晶度和高氧空位浓度增强了氢和氮的吸附，并导致以H ₂形式解吸了表面氢。因此，Ru / CeO ₂纳米棒显示出高的氨合成活性。相反，与Ru / CeO ₂纳米立方催化剂相比，观察到较低的催化活性，因为由于Ru物种的粒径大和氧空位浓度低，H ₂和N _2的吸附似乎不太合理，并且大多数氢物种为在H ₂ O形成中消耗。

更新日期：2018-07-09

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