Cobalt and cobalt carbide on alumina/NiAl(110) as model catalysts,Catalysis Science & Technology

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Cobalt and cobalt carbide on alumina/NiAl(110) as model catalysts
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2017-10-30 00:00:00 , DOI: 10.1039/c7cy01806a
Tianfu Zhang _{1,

2,

3,

4,

5} , Jingsong Wu _{1,

2,

3,

4,

5} , Yuqun Xu _{1,

2,

3,

4} , Xiaoping Wang _{1,

2,

3,

4} , Jun Ni _{4,

5,

6,

7} , Yongwang Li _{1,

2,

3,

4} , J. W. (Hans) Niemantsverdriet _{1,

2,

3,

4}

Affiliation

Cobalt is an important catalyst for Fischer–Tropsch synthesis, and it can form cobalt carbide under syngas (CO + H₂) reaction conditions, especially in CO-rich mixtures. As cobalt carbide has been credited as a promoter which brings about significant selectivity changes in CO hydrogenation, we are interested in studying it using a surface science approach, to understand its interaction with important reaction intermediates. In the present study, we use a NiAl(110) surface to produce a flat alumina film and prepare cobalt and cobalt carbide thereon. We find that cobalt is thermally stable up to 800 K on alumina/NiAl(110). Different preparation temperatures result in different morphologies of the surface. Cobalt carbide is obtained by evaporating cobalt in an C₂H₄ environment, as proved by the appearance of a C 1s peak at 283.3 eV of carbidic carbon and at 286.2 eV of chemisorbed CO on cobalt carbide in the XPS spectra. Large cobalt carbide crystals with a typical size of 100 nm × 50 nm are revealed by STM. The results show that cobalt and cobalt carbide on alumina/NiAl(110) can serve as suitable model systems for studying structures, adsorption and catalytic properties.

中文翻译：

氧化铝/ NiAl（110）上的钴和碳化钴作为模型催化剂

钴是费-托合成的重要催化剂，在合成气（CO + H ₂）反应条件下，特别是在富含CO的混合物中，它可以形成碳化钴。由于碳化钴被认为是促进CO加氢选择性显着变化的促进剂，因此我们有兴趣使用表面科学方法对其进行研究，以了解其与重要反应中间体的相互作用。在本研究中，我们使用NiAl（110）表面产生平坦的氧化铝膜，并在其上制备钴和碳化钴。我们发现钴在氧化铝/ NiAl（110）上的热稳定性高达800K。不同的制备温度导致表面的形态不同。碳化钴是通过在C ₂ H _4中蒸发钴而获得的在XPS光谱中，在碳化钴的283.3 eV处和化学吸附的CO的286.2 eV处出现了C 1s峰，证明了这种环境。STM揭示了典型尺寸为100 nm×50 nm的大型碳化钴晶体。结果表明，氧化铝/ NiAl（110）上的钴和碳化钴可以作为研究结构，吸附和催化性能的合适模型系统。

更新日期：2017-11-08

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