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PtFe@S-1 Coupling with ZSM-5 for the Propane Dehydro-Aromatization Reaction: The Effect of Acidity and b-Axis Diffusion Distance
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2024-11-21 , DOI: 10.1021/acs.iecr.4c03194
Kai Bian, Sirui Liu, Jiaxing Zhang, Guanghui Zhang, Xinwei Zhang, Gideon Abaidoo Ocran, Mingrui Wang, Quanjie Liu, Shuandi Hou, Xinwen Guo

A series of ZSM-5 zeolites with different acidities and b-axis diffusion distances were synthesized under hydrothermal conditions using the seed-induced method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), ammonia temperature-programmed desorption (NH3-TPD), and infrared spectroscopic analysis of the adsorption of pyridine (Py-IR). The structure–activity relationships of PtFe@S-1&ZSM-5 tandem catalysts in the propane dehydro-aromatization reaction (PDA) were investigated, especially focusing on the impact of ZSM-5 acidity and b-axis diffusion distance. The results indicate that the ZSM-5 zeolite with a low Si/Al ratio (∼25) and suitable b-axis diffusion distance (∼100 nm) coupled with PtFe@S-1 is more conducive on improving the PDA catalytic performance. When the mass ratio of PtFe@S-1/ZSM-5 was 1:1, the propane conversion and aromatics selectivity of PtFe@S-1&ZSM-5–25 remained above 78.9% and 40.5% within 500 min on stream, respectively.

中文翻译:


PtFe@S-1 与 ZSM-5 偶联用于丙烷脱氢芳构化反应:酸度和 b 轴扩散距离的影响



采用晶种诱导法在水热条件下合成了一系列不同酸度和 b 轴扩散距离的 ZSM-5 分子筛,并通过 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、透射电子显微镜 (TEM)、氨程序升温脱附 (NH3-TPD) 和吡啶吸附红外光谱分析 (Py-IR) 对其进行表征。研究了 PtFe@S-1&ZSM-5 串联催化剂在丙烷脱氢芳构化反应 (PDA) 中的构效关系,特别关注 ZSM-5 酸度和 b 轴扩散距离的影响。结果表明,具有低 Si/Al 比 (∼25) 和合适的 b 轴扩散距离 (∼100 nm) 的 ZSM-5 分子筛与 PtFe@S-1 耦合更有利于提高 PDA 催化性能。当 PtFe@S-1/ZSM-5 质量比为 1:1 时,PtFe@S-1&ZSM-5–25 的丙烷转化率和芳烃选择性在 500 min 内分别保持在 78.9% 和 40.5% 以上。
更新日期:2024-11-22
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