Among the Fischer-Tropsch synthesis (FTS) catalysts, Cobalt catalysts are currently attracting a lot of research interests due to their high activity and high selectivity. But the dispersion and reducibility of cobalt catalysts with moderate interaction between cobalt and support are still a challenge. A novel amino-ended hyperbranched polyamide (AEHPA) was used to modify SBA-15 and then was applied as support for obtaining cobalt catalyst (15Co/SBA-15-N). The catalysts were characterized by XRD, TEM, XPS and H₂-TPR techniques. The results showed that AEHPA doped mesoporous SBA-15 caused the generation of N species in the SBA-15 pore channels. The N-Co bonds resulted in the formation of highly-dispersed cobalt nanoparticles with uniform sizes inside the ordered mesopores of support. AEHPA doping was an effective way to modify the surface properties of the SBA-15 for immobilizing cobalt nanoparticles. Compared with the conventional 15Co/SBA-15 catalyst without doping AEHPA, the AEHPA doped 15Co/SBA-15-N catalyst showed improved cobalt dispersion and stabilized cobalt location, which led to much better reaction stability as well as C₅₊ selectivity.

中文翻译：

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氨基端超支化聚酰胺改性的SBA-15作为高效钴费托合成催化剂的载体

在费-托合成（FTS）催化剂中，钴催化剂由于其高活性和高选择性而目前吸引了许多研究兴趣。但是钴催化剂的分散性和还原性以及钴和载体之间的适度相互作用仍然是一个挑战。一种新型的氨基端超支化聚酰胺（AEHPA）被用来改性SBA-15，然后被用作载体来获得钴催化剂（15Co / SBA-15-N）。用XRD，TEM，XPS和H ₂对催化剂进行了表征。-TPR技术。结果表明，AEHPA掺杂介孔SBA-15导致SBA-15孔道中N物种的产生。N-Co键导致在有序的中孔内形成尺寸均匀的高度分散的钴纳米颗粒。AEHPA掺杂是修饰SBA-15固定钴纳米颗粒表面性能的有效方法。与不掺杂AEHPA的常规15Co / SBA-15催化剂相比，掺杂AEHPA的15Co / SBA-15-N催化剂显示出改善的钴分散性和稳定的钴位置，从而导致更好的反应稳定性以及C ₅₊选择性。