Graphitic carbon nitride (GCN) nanosheets decorated with iron nanoparticles (Fe/g-C₃N₄) were synthesized and used as catalysts in FTS. The crystal structure and morphology of Fe/g-C₃N₄ were characterized with XRD, FT-IR, HRTEM, EXAFS, BET, and its texture evolution during Fischer-Tropsch synthesis was monitored. It was shown that there were two types of iron species in Fe/GCN, i.e., “dissolved iron”, in which irons dissolved into g-C₃N₄ matrix as single atoms, and formed mainly at low Fe loadings. In contrast, when the loading exceeded the dissolved saturation, the irons would coordinate with (-N-CN-)²⁻ to form the second type of iron species, Fe(NCN) like species. The “dissolved iron” was more difficult to thermally decompose and convert into iron carbide than Fe(NCN) like species. Such a slow transformation gave birth to unique induction period for low loading Fe catalysts. Moreover, the N-containing bases or defects of g-C₃N₄ might play a critical role in enhancing O/P ratio. As a result, g-C₃N₄ supported 40 wt% Fe sample exhibited highest activity and C₂⁼-C₄ ⁼ selectivity. Besides, the g-C₃N₄ possessed a “structure memory effect” analogous to hydrotalcite.

合成了装饰有铁纳米颗粒（Fe / gC ₃ N ₄）的石墨氮化碳（GCN）纳米片，并将其用作FTS中的催化剂。用XRD，FT-IR，HRTEM，EXAFS，BET对Fe / gC ₃ N ₄的晶体结构和形貌进行了表征，并对费托合成过程中的织构演变进行了监测。结果表明，Fe / GCN中有两种类型的铁，即“溶解的铁”，其中铁以单原子形式溶解在gC ₃ N ₄基质中，并且主要在低Fe负载下形成。相反，当载荷超过溶解的饱和度时，铁将与（-NC N-）^2-形成第二种铁物种，即Fe（NCN）类物种。与Fe（NCN）一样，“溶解的铁”更难以热分解并转化为碳化铁。如此缓慢的转变为低负载铁催化剂带来了独特的诱导期。此外，gC ₃ N ₄的含N碱或缺陷可能对提高O / P比起关键作用。结果，gC ₃ N ₄负载的40重量％的Fe样品表现出最高的活性，并且C ₂ ^＝ -C ₄  ^＝ 选择性。此外，gC ₃ N ₄具有类似于水滑石的“结构记忆效应”。