Research progress of microstructure for cobalt-based F-T catalysts
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摘要:
费托合成可将煤、天然气及生物质等各种非石油含碳资源通过合成气转化为各种油品和精细化学品。钴基催化剂因其水煤气变换反应活性低、费托反应活性高、碳链增长能力高的优良特点,在工业应用和相关科学研究上备受关注。钴基催化剂微观活性位的结构和费托反应过程中催化剂的表面吸附物等都会对F-T合成反应的产物分布以及催化性能有影响。本文分析总结了钴基费托合成催化剂中尺寸效应、晶相、晶面效应以及微观活性位点的研究进展,重点介绍了微观活性位的类型和微观活性位的表征方法/表面吸附行为,最后展望了钴基催化剂的未来发展方向和应用前景。
Abstract:Fischer-Tropsch synthesis (FTS) is a promising route to produce various olefins and fine chemicals from non-petroleum carbon sources that can be used to produce synthesis gas, such as coal, natural gas and biomass. Cobalt-based catalysts have gained more attention in FTS for the academic research and industrial applications, owing to their excellent catalytic properties such as low water-gas-shift activity, great Fischer-Tropsch reaction activity and high chain growth probability. The structure of the microscopic active site and the surface adsorption of the cobalt-based catalyst during the Fischer-Tropsch progress have an effect on the product distribution and catalytic performance. In this review, we summarized some advancements in the development of cobalt-based F-T catalysts focusing on the effects of particle size, crystal phase, crystal plane and microscopic active site, with emphasis on the research from the types, surface adsorption behavior and characterization techniques of microscopic active site. Some suggestions for the development of cobalt-based F-T catalysts in the future are also given.
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图 5 在500 K下计算低覆盖度下CO在HCP Co(蓝色)、FCC Co(绿色)和FCC Co缺陷位点(红色)的解离速率已按FCC CO(111)计算的CO解离速率归一化[19]
Figure 5 Calculated low-coverage CO dissociation rates at 500 K (in site–1 ·s–1) on HCP Co facets (blue), FCC Co facets (green), and FCC Co defect sites (red)Rates have been normalized to the CO dissociation rate calculated for FCC Co(111)[19]with permission from ACS Publications
图 7 CN=10的 hcp 相和 fcc 相((a)和(c)),CN=11的HCP相和FCC相((b)和(d))[26]
Figure 7 Distribution of CS for CN = 10 ((a) & (c)) & CN = 11 ((b) & (d)) Top panels are for hcp phase and bottom for fcc phase, Each plot has data corresponding to 2 sizes of nanoparticles as mentioned in the legend, Arrows indicate which distribution corresponds to what type of B5 sites [26]with permission from Elsevier
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