A series of Fe-substituted ZSM-48 catalysts including Fe-free HZ48 and partially and fully Fe-substituted HZ48-x (x = Al/Fe = 9, 5, 1, and 0) is synthesized via an in situ seed-induced hydrothermal process with the aim to improve the iso-selectivity of long-chain n-alkane hydroisomerization. X-ray powder diffraction, UV–vis, UV-Raman, and X-ray photoelectron spectroscopy analyses confirm that Fe³⁺ species are effectively incorporated into the *MRE framework. NH₃-TPD and Py-IR show that not only the strength of strong acid reduces with the increased Fe-substitution, the total Brønsted acidity also decreases. To support hydroisomerization of n-C₁₂, Pt is loaded to the HZ48 and HZ48-x supports. The reaction testing shows that the Fe-substitution consistently increases the isomer yield than the Fe-free Pt/HZ48. The partially Fe-substituted Pt/HZ48-5 delivers the highest isomer yield of 78.9% i-C₁₂, a 15.7% increase compared to the Fe-free Pt/HZ48 catalyst. The iso-selectivity achieved also shows a strong positive correlation with the B_W+M% of the catalysts.

中文翻译：

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铁取代的 Pt/HZSM-48 在正十二烷加氢异构化中对 i-C12 的高选择性

通过原位种子诱导合成了一系列 Fe 取代的 ZSM-48 催化剂，包括无 Fe HZ48 和部分和完全 Fe 取代的 HZ48- x ( x = Al/Fe = 9, 5, 1, and 0)旨在提高长链正构烷烃加氢异构化异构选择性的水热工艺。X 射线粉末衍射、UV-vis、UV-Raman 和 X 射线光电子能谱分析证实 Fe ³⁺物质有效地结合到 *MRE 框架中。NH ₃ -TPD和Py-IR表明，不仅强酸的强度随着Fe取代度的增加而降低，总布朗斯台德酸度也降低。支持n -C _{12的加氢异构化}, Pt 加载到 HZ48 和 HZ48- x支架上。反应测试表明，与不含铁的 Pt/HZ48 相比，铁取代始终增加异构体产率。部分铁取代的 Pt/HZ48-5 的异构体产率最高，为 78.9% i -C ₁₂，与不含铁的 Pt/HZ48 催化剂相比提高了 15.7%。实现的等选择性也显示出与催化剂的 B _W+M % 的强正相关。