Synthesis, characterization and n-hexane hydroisomerization performances of Pt supported on alkali treated ZSM-22 and ZSM-48

被引：38

作者：

Li, Haoran ^{[1
]}

Liu, Chenglian ^{[1
]}

Wang, Yan ^{[1
]}

Zheng, Jiajun ^{[1
]}

Fan, Binbin ^{[1
]}

Li, Ruifeng ^{[1
]}

机构：

[1] Taiyuan Univ Technol, Coll Chem & Chem Engn, Taiyuan 030024, Shanxi, Peoples R China

来源：

RSC ADVANCES | 2018年 / 8卷 / 51期

基金：

中国国家自然科学基金;

关键词：

ZEOLITE CATALYSTS; LIGHT OLEFINS; POSTTREATMENT; MESOPORES; PLATINUM; CRACKING; ENHANCE;

D O I：

10.1039/c8ra04858d

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

ZSM-48 and ZSM-22 zeolites with similar Si/Al molar ratio have been treated with alkali to modify the pore structures and acidity, and alkali treated ZSM-22 and ZSM-48 samples have been characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), N-2 adsorption/desorption, Nuclear Magnetic Resonance (NMR), NH3-Temperature Programmed Desorption (NH3-TPD) and Pyridine-Fourier Transform Infrared Spectroscopy (Py-FTIR). Characterization results indicate that NaOH treatment could improve the mesoporous structure for both ZSM-22 and ZSM-48. NaOH treatment modifies the acidity of ZSM-22 and ZSM-48 diversely. The n-hexane hydroisomerization performances of Pt supported protonic form ZSM-22 and ZSM-48 (Pt/HZSM-22 and Pt/HZSM-48) bifunctional catalysts have been evaluated in a fixed bed reactor. Catalytic results indicate that catalytic activity and selectivity depend on both pore structure and acidity of zeolites. In comparison of Pt/HZSM-22 and Pt/HZSM-48, Pt/HZSM-22 shows better n-hexane hydroisomerization performance at relatively low temperature (<300 degrees C), meanwhile, at relatively high temperature (>300 degrees C) Pt/HZSM-48 exhibits better catalytic performance. Moreover, alkali treated Pt/HZSM-48 could produce more di-branched isomer compared with alkali treated Pt/HZSM-22.

引用

页码：28909 / 28917

页数：9

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