FTO反应Fe基催化剂活化与活性相研究进展Q

Research progress of iron-based for FTO reaction on activation manner, active phases

摘要:

综述了铁基催化剂对合成气一步法制备低碳烯烃反应（FTO）的研究进展，总结了活化过程、辨析了活性相对FTO反应性能的影响。铁基催化剂具有成本低、易得、操作温度范围宽等诸多优点而备受关注。然而，物相复杂、活性相不确定、反应性能有待提升等诸多缺点也是Fe基催化剂现今存在的主要问题。活化过程与气氛直接相关，且整体呈现由表相向体相递进反应的趋势。还原气中含CO时，催化剂表相会生成活性物相FeCx，且随着温度和反应的进行逐渐发生ε-Fe2C→ε′-Fe2.2C→χ-Fe2.5C→θ-Fe3C的反应，θ-Fe3C已被报道具有很好的FTO反应性能。本文对近10年关于Fe基FTO反应催化剂活化和活性相的研究发展进行了浅显的综述，力求寻求这些研究中的规律性知识，以期对未来FTO反应铁基催化剂的反应性能研究提供帮助。

Abstract:

The research progress of iron-based catalysts for Fischer-Tropsch to olefins(FTO) from syngas was reviewed. The process of reduction and activation was summarized, the active phase was distinguished, and the influence of carrier on the FTO reaction was discussed. Iron-based catalysts have attracted much attention due to their advantages such as low cost, easy availability and wide operating temperature range. However, many disadvantages such as complex phase, uncertain active phase and the need to improve the reaction performance are also the main problems. The activation process is directly related to the atmosphere, and the overall reaction trend is progressive from the surface to the bulk. The active phase FeCx is formed in the surface of the catalyst, and the reaction of ε-Fe2C→ε'-Fe2.2C→χ-Fe2.5C→θ-Fe3C gradually occurs with the temperature and reaction in CO containing atmosphere. θ-Fe3C has been reported to have good FTO reaction performance. In this paper, the research progress on the activity and active phase of Fe-based FTO catalysts in recent 10 years is briefly reviewed, and the regularity knowledge in these studies is sought in order to provide help for the study of the reaction performance of Fe-based catalysts for FTO reaction in the future.